Abstract
The development of sodium-ion (SIBs) and potassium-ion batteries (PIBs) has increased rapidly because of the abundant resources and cost-effectiveness of Na and K. Antimony (Sb) plays an important role in SIBs and PIBs because of its high theoretical capacity, proper working voltage, and low cost. However, Sb-based anodes have the drawbacks of large volume changes and weak charge transfer during the charge and discharge processes, thus leading to poor cycling and rapid capacity decay. To address such drawbacks, many strategies and a variety of Sb-based materials have been developed in recent years. This review systematically introduces the recent research progress of a variety of Sb-based anodes for SIBs and PIBs from the perspective of composition selection, preparation technologies, structural characteristics, and energy storage behaviors. Moreover, corresponding examples are presented to illustrate the advantages or disadvantages of these anodes. Finally, we summarize the challenges of the development of Sb-based materials for Na/K-ion batteries and propose potential research directions for their further development.
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Introduction
Lithium-ion batteries (LIBs) have penetrated into every aspect of people’s life since their commercial application in 1991. Portable electronic devices and electric vehicles are typically powered by LIBs [1, 2]. However, the dramatic rise in the cost of LIBs has risen dramatically due to the uneven distribution of lithium sources, and the explosive growth in demand restricts large-scale energy storage applications in the future [3]. In recent years, sodium-ion (SIBs) and potassium-ion batteries (PIBs) have attracted much attention because they have the same reaction mechanism as LIBs and have the advantages of abundant sodium (Na) and potassium (K) resources (Fig. 1a), low cost, and applicable working voltage [4,5,6].
To date, few anode materials for SIBs and PIBs can match the status of commercial graphite in LIBs. Therefore, a formidable challenge for the universal application of SIBs and PIBs is to identify and synthesize practical SIB and PIB anode electrode materials with high energy density and long cycle stability. Various types of anode materials for SIBs and PIBs have been studied in detail, such as carbon materials, metals, metal oxides, alloys, sulfides, selenides, and phosphides [7,8,9,10,11,12,13,14,15,16]; among them, alloy-based materials, which usually show a higher theoretical capacity by virtue of the alloying reaction mechanism (Fig. 1b), have been extensively studied [11, 15]. For example, Si-based materials exhibit a relatively high capacity and poor electrical conductivity that limits their inherent advantages. Another type of high capacity material is the phosphorus-based composites; however, they suffer from both the safety issue and an over 440% volume expansion during operation. By contrast, antimony (Sb) and Sb-based hybrids have become promising candidates because of their excellent cycle stability, high theoretical capacity in both Na- and K-storage, and low price [17,18,19,20]. However, because the failure phenomenon of Sb-based materials is difficult to avoid, researchers must explore new solutions.
The degradation mechanism of Sb-based anodes in SIBs and PIBs can be classified into two aspects: failure of the electrode material and deficiency of the battery system (Fig. 1c). The nature of the material itself is the most important degradation factor. Because of the larger ionic radius of Na and K, the volume changes of Sb-based materials during SIB/PIB cycling are worse than that in LIBs. Consequently, Sb-based electrodes will face the following failure mechanisms during operation: (1) the volume expansion will cause the material to fall off from the electrode, resulting in loss of active materials and gradual reduction of the capacity that can be used in the operation of the device and (2) the huge volume change (390% for Na, 407% for K) during the charge and discharge processes will lead to the pulverization of Sb-based anode and cause the agglomeration of nanoparticles; these phenomena not only slow down the chemical reaction kinetics but also weaken the Coulombic efficiency [17, 20, 21].
In addition to the main factor of material properties, systemic factors, such as electrolyte selection and battery assembly, will cause degradation of the energy storage performance. In the current electrolytes for SIBs and PIBs, many side reactions are prone to occur in the process of storing Na/K ions, possibly leading to battery failure [20]. In particular, in a full cell, the parasitic reaction occurring through the SEI layer will irreversibly consume the Na/K ions in electrolytes and lead to sharp capacity losses [21].
To overcome the shortcomings of current anodes, a series of Sb-based electrodes in a variety of structures, compositions, and projects were designed and prepared as anodes for SIBs and PIBs. As shown in Fig. 2, the enhancement strategies mainly involve preparing small-sized nanoparticles, compounding with carbon materials, doping with heteroatom dopants, obtaining hierarchical/heterogeneous structure, and constructing yolk-shelled/hollow structure.
Each of these methods has particular advantages and characteristics. The nanoscale particles can directly enhance the reaction kinetics of electrode materials by shortening the pathway of electron diffusion and charge transfer. More importantly, nanoparticles could further alleviate the drastic change of volume during the processes of charge and discharge for SIBs/PIBs. For example, Maksym’s group [22] demonstrated that Sb nanocrystals of around 20 nm present excellent rate and stable properties when used as the anode material in SIBs. In addition, one of the most widely used methods is to combine a carbon framework with various structures obtained through different synthesis strategies because the carbon skeleton usually plays a dual role in increasing the electrical conductivity of electrode materials and preventing pulverization, thereby maintaining excellent rate activity and cycle stability [16, 23, 24]. For example, Ge and co-workers [25] synthesized ultra-small Sb nanocrystals within carbon nanofibers containing hollow nanochannels (u-Sb@CNFs) through electrospinning; this u-Sb@CNFs complex used as a PIB anode presented a reversible capacity of 225 mA∙h/g over 2000 cycles at 1 A/g. Guo’s group [26] reported nanostructured Sb in an N-doped carbon matrix prepared by a one-step and solvent-free pyrolysis method that displayed high sodium storage and excellent cycle stability. Duan et al. [27] demonstrated a Sb/CCHI nanocomposite synthesized by self-wrapping and controlled growth process that possessed a reversible capacity of 403 mA∙h/g at 250 mA/g, an excellent rate capability (138 mA∙h/g at 32 A/g), and good cycle stability. In order to further improve the conductivity of the carbon framework, enhance the charge and ion transfer speed, and boost the amount of sodium/potassium storage, the patterns of heteroatom doping have become the focus of attention. Nitrogen (N), sulfur (S), and phosphorus (P) are the most frequently doped atoms, with N and S being the most widely used heteroatom dopants [28,29,30]. However, P doping is rarely reported in Sb-based materials because of the safety hazards involved with the P species and technical difficulties. Chen and Tuan [31] prepared phosphorus-embedded ultra-small BiSb nanocrystals through solution precipitation and used the material as a PIB anode electrode; the composite material exhibited excellent cycle stability (339.1 mA∙h/g at 1 A/g after 550 cycles) and outstanding rate performance (258.5 mA∙h/g at 6.5 A/g). Dong and co-workers [32] constructed porous phosphosulfide nanospheres combined with ultra-small Sb nanoparticles pinned into 3D macroporous carbon foam (Sb∣P-S@C) that displayed reversible capacities of 490 mA∙h/g at 0.1 A/g over 1000 cycles when used as an SIB anode. Both S and P are electrochemically active elements that can react with sodium and potassium; this reaction can not only improve the conductivity but also provide additional capacity when combined with the matrix carbon material [8, 33, 34]. In this regard, the composite of P-doped carbon framework and Sb-based materials should receive increasing attention and be developed vigorously. Compared with the above-mentioned improved system, generally, the carbon architecture (such as multi-level structure, yolk-shelled structure, and hollow structure) plays a more significant role in enhancing the storage capacity of Na and K.
In this review, we focus on the use of Sb-based materials as the anodes of SIBs and PIBs. Specifically, Sb-based materials will be analyzed according to their respective composition, including metallic Sb, Sb oxides, Sb sulfides, and Sb alloys. For each part, we will define the problems faced by Sb-based materials in this category and introduce researchers’ measures to solve specific problems, such as introducing carbon protection and constructing special structures. Consequently, the effectiveness of these measures will be discussed, and the corresponding energy storage performance will be reviewed. Finally, the current opportunities and challenges of Sb-based material will be listed to provide guidance for future research on Sb-based electrode materials.
Sodium-Ion Batteries
Metallic Antimony for Sodium-Ion Batteries
Recently, the sodium storage mechanisms of Sb-based materials have been introduced in detail in previous reports. Briefly, metal Sb and sodium can contribute up to a theoretical capacity of 660 mA∙h/g, depending on the alloying/dealloying reaction (Sb + 3Na+ + 3e− ↔ Na3Sb) [11, 16,17,18, 20]. However, the volume of Sb changes sharply (around 390%) during the Na+ charge and discharge processes, causing the electrode material to be crushed and fall from the current collector, resulting in irreversible capacity decline. In addition, Sb reduces the performance in sodium storage owing to the poor conductivity, especially the rate capacity [35, 36]. In the process of overcoming the above conundrums, special structures prepared by multi-directional synthesis strategies often play a key role. In the structure of metal Sb regard [37], Yang et al. [38] used a hybrid of amorphous Sb/N-doped layered carbon as a SIB anode and obtained remarkable stability (280.5 mA∙h/g over 500 cycles at 1 A/g) and excellent rate capability (479.6 and 298.7 mA∙h/g at current density of 0.1 and 2 A/g, respectively). Starting from the structure of Sb itself, Tian et al. [39] reported that two-dimensional (2D) few-layer Sb has the highest theoretical capacity utilization, as indicated by the highest capacity (642 mA∙h/g at 66 mA/g) among many Sb materials and the capacity to hold 620 mA∙h/g at 330 mA/g over 150 cycles. It can be seen that 2D materials and 2D carbon framework modification methods are effective in facilitating Na storage because of the rapid migration of electrons and charges on the 2D layered substance surface.
The different configurations of Sb-carbon hybrids will further affect the Na storage ability of the electrode. In particular, the use of a yolk-shelled structure has been recognized as one of the most effective methods to adjust volume expansion and thus improve the cycle stability of materials [40,41,42]. As displayed in Fig. 3a, b, Song et al. [43] prepared yolk-shelled structure Sb@C anodes by virtue of a controlled reduction and selective removal method and found that the anodes delivered a high rate capability (554 mA∙h/g at 50 mA/g and 315 mA∙h/g at 6.6 A/g) and 92% capacity retention over 200 cycles (Fig. 3c). The yolk-shelled structure accommodates the volume expansion of Sb during sodium insertion and thus prevents the electrode structure from being damaged. Also, in situ TEM characterization was employed to prove that the yolk-shelled structure can effectively avoid the collapse of the structure during the Na+ embedded process, thereby ensuring the cycle stability (Fig. 3d). To conduct a full cell investigation, the O3-Na0.9[Cu0.22Fe0.30Mn0.48]O2 was chosen as the cathode. The electrochemical test showed that the voltage range of the full cell is 2.0–4.0 V and the specific energy was calculated to be 130 W∙h/kg. In addition, Mai's group [44] synthesized Sb@N–C with a nanorod-in-nanotube structure by way of a bottom-up confinement pathway. The structure is of an approximate yolk-shelled structure, which can relieve the internal stress generated by metal Sb during the charge and discharge processes, further improving the cycle stability. Moreover, the N-doped carbon nanotube can effectively improve ion transport, thus resulting in excellent rate performance. As a result, Sb@N–C showed an excellent high rate (309.8 mA∙h/g at 10 A/g) and the cycle stability of up to 345.6 mA∙h/g after 3000 cycles at 2 A/g for Na storage.
Recently, our group [45] proposed a one-pot strategy for the synthesis of porous microsphere composite materials surrounded by N/S co-doped carbon nanosheets wrapped with yolk-shelled Sb. Because of the interaction of the strong yolk-shelled structure and the N/S co-doped porous microspheres, the obtained material has achieved a cycle stability of 331 mA∙h/g after 10,000 cycles at 20 A/g. Note that the synthesis strategy is suitable for large-scale preparation and provides a reference for commercial applications. More importantly, the yolk-shelled architecture can effectively maintain the structural integrity of electrode materials and improve cycle stability during the repeated charge and discharge processes. In short, the use of the yolk-shelled structure is a promising method to boost the Na storage performance of a Sb-based material.
The hollow structure is one of the most suitable architectures that can improve the Na storage behavior of electrode materials, which has a positive effect on Sb species [46, 47]. As presented in Fig. 4a, Liu et al. [48] discovered that Sn and Sb can exchange ions (3Sn + 4Sb3+ → 3Sn4+ + 4Sb) and that the hollow Sb spheres can be formed and completely coated by carbon shell during the ion exchange process. There are many void spaces in the hollow sphere that can fully accommodate the volume change of Sb during charging and discharging. A compact solid electrolyte interface will form at the outer layer of the hollow sphere. Finally, the hollow Sb@C used as an anode for SIBs displayed high rate capability at 2 A/g and maintained a capacity of ~ 280 mA∙h/g over 200 cycles at 1 A/g (Fig. 4b). Liu and co-workers [49] synthesized unique Sb@C coaxial nanotubes via carbon reduction Sb2S3. These coaxial nanotubes have a hollow-like structure and can achieve high electron/charge dynamics and structural integrity. As a SIB anode, the composite delivered a reversible capacity of 350 mA∙h/g and 310 mA∙h/g at 10 and 20 A/g, respectively, and maintained a specific capacity of 240 mA∙h/g over 2000 cycles at 1 A/g. As a recyclable template strategy for making pores and hollow skeletons, salt template technology has been used in LIBs and SIBs [45, 50, 51]. Xu et al. [52] employed the KCl template to prepare Sb HPs@OCB with hollow Sb nanoparticles encapsulated in a carbon box (Fig. 4c). The hollow nanoparticle architecture can significantly enhance the kinetics of the sodium storage reaction. Ultimately, the Sb HPs@OCB composite displayed an excellent rate capability of 345 mA∙h/g at 16 A/g and a specific capacity of 187 mA∙h/g over 300 cycles at 10 A/g under 50 C. Evidently, the hollow structures obtained via various synthesis strategies often exhibit excellent rate and cycle stability. However, methods to improve the first-cycle Coulombic efficiency and increase the vibration density should also be studied.
In addition to using carbon to coat Sb for enhancing the performance of sodium storage, compositing Sb with other stable materials in the charge and discharge processes is another effective approach [41]. For example, Kong and co-workers [53] synthesized Sb@C@TiO2 triple-shell nano-boxes via a template-engaged galvanic replacement approach. As expected, the anode exhibited excellent rate performance and ultra-long cycle stability (193 mA∙h/g over 4000 cycles at 1 A/g), relying on the TiO2-shell in SIBs. In a similar manner, Lee et al. [54] prepared Sb-embedded silicon oxycarbide composites via a one-pot pyrolysis process (Fig. 5a). Because of the free-carbon domain of the silicon–oxygen–carbon framework and uniform distribution of embedded Sb nanoparticles, the conductivity is improved and the agglomeration of Sb during the reaction process is inhibited in the SIB anode. Unsurprisingly, the composite materials kept a capacity retention rate of ~ 97% over 250 cycles and exhibit 510 mA∙h/g and 453 mA∙h/g at 0.1 C and 20 C rate, respectively (Fig. 5b, c). At the same time, the capacity of the sample did not decrease significantly after 100 cycles at 0.5, 1, and 2 C (Fig. 5d). Therefore, the influence of the non-pure carbon matrix should be valued for Na storage in the future.
In an alternative approach, the heteroatom dopants inside of carbon can effectively improve the ion transport kinetics and electron diffusion ability of Sb active materials, thereby providing the possibility to obtain a high rate performance SIB anode [55,56,57]. As revealed in Fig. 6a, Cui and co-workers [58] fabricated composite hybrids of Sb nanorods encapsulated in an N and S co-doped carbon skeleton. The N and S dopants in the carbon framework contribute to the enhancement of charge and electron mobility. Therefore, the composite displayed high reversible capacities and long-term cycle stability (621.1 mA∙h/g at 100 mA/g after 150 cycles and 390.8 mA∙h/g at 1 A/g after 1000 cycles) for a SIB anode. In addition, the hierarchical structure can achieve superb Na storage vitality as an anode for metal Sb materials because of the large specific surface area and the synergy between different types of structures. For instance, Yu et al. [59] reported a strategy that enabled the tiny Sb nanoparticles to be fully embedded in MOF-derived carbon and TiO2 nanotubes. The obtained Sb ⊂ CTHNs presented enhanced stability when used as a Na-ion battery anode. Using Na3V2(PO4)3 as the cathode, a full cell was assembled to examine the practical performances of Sb ⊂ CTHNs. This cell displayed two charge and discharge plateaus at 2.45 V and 2.65 V and achieved a reversible capacity of 497.7 mA∙h/g after 100 cycles. The reason for such stability could be the limitation of the volume expansion of Sb by the carbon and TiO2 walls. In addition, as shown in Fig. 6b, Fan et al. [60] constructed a core-shelled Cu@Sb nanowire array anchored on 3D porous Cu foam through anodization and high-temperature reduction. The hierarchical 3D structure with interconnected pores and voids between nanowires can effectively relieve the internal stress and promote the consistent transport of electrons and ions along the growth direction of the nanowire during charging and discharging. As a result, this core-shelled structure delivered a capacity of 605.3 mA∙h/g at 330 mA/g and demonstrated a capacity retention rate of 84.8% at 3.3 A/g after 200 cycles as an anode for SIBs. Li et al. [61] proposed a self-supported Sb prism array that was directly grown on a Cu substrate by way of a template-free electrodeposition (Fig. 6c). Similar to the above-mentioned Cu@Sb nanowires array, the Sb prism array, by virtue of the hierarchical construction, had enough space between each other to adjust the internal stress generated during the sodium storage process and thus improve the cycle stability. Ultimately, the Sb array kept 531 mA∙h/g and 492 mA∙h/g over 100 cycles at 0.5 C and 1 C, respectively (Fig. 6d). Attractively, heteroatom doping and ingenious hierarchical structure design can bring excellent sodium storage properties for Sb. In particular, the idea can be extended to other Sb-based materials.
In order to better highlight and compare the electrochemical performance of the metal Sb-based materials, we summarize the reported electrochemical performance of metal Sb as the anode of SIBs in Table 1. A variety of nano- or micro-structural and morphology designs allow metal Sb to exhibit excellent rate performance and cycle stability [62,63,64,65,66,67,68,69,70,71,72,73,74]. These innovative studies not only establish an effective electrode configuration for the future exploration of metal Sb but also provide a wealth of reference materials for the rational design of other Sb-based materials.
Antimony Oxides for Sodium-Ion Batteries
Antimony oxide mainly contains Sb2O3 and Sb2O4, for which the theoretical capacity of the anode is 1102 mA∙h/g and 1120 mA∙h/g in SIBs, respectively. In comparison with Sb2O4, Sb2O3 has been studied more because it is an easily synthesized Sb-based oxide material via the simple lower temperature heat treatment. The process of storing sodium by antimony oxide can be summarized as follows [17, 75]:
However, extensive research studies and practical applications of Sb2O3/Sb2O4 as an anode for SIBs are limited because of their poor conductivity. For this reason, Sb2O3/Sb2O4 and materials with excellent conductivity are combined into composites to produce the electrode of SIBs [76,77,78], with compounding with carbon materials being the most common and effective strategy [79, 80]. As revealed in Fig. 7a, Wang et al. [81] prepared Sb2O4/RGO with Sb2O4 nanorods anchored on reduced graphene oxide. With the aid of reduced graphene oxide, the rod-like Sb2O4 showed a reversible capacity of ~ 551 mA∙h/g over 100 cycles at 50 mA/g (Fig. 7b) and obtained a rate performance of ~ 401 mA∙h/g at 1 A/g. In another strategy, Guo and co-workers [82] fabricated Sb2O3/MXene (Ti3C2Tx) hybrid materials via a facile solution-phase project. The MXene has two functions: (1) the highly conductive MXene can provide an efficient transport path for ions and electrons; (2) the 2D sheet spacing configuration can effectively release the internal stress generated during the sodium storage process. Therefore, the Sb2O3/Ti3C2Tx presented a rate capacity of 295 mA∙h/g at 2 A/g and delivered a capacity of 472 mA∙h/g over 100 cycles at 100 mA/g as an SIB anode. The combination of Sb and Sb2O3 can boost not only the ability of electron diffusion and charge transfer due to the higher conductivity of metal Sb but also the extra high specific capacity produced by Sb2O3 in the process of sodiation and desodiation. Moreover, Na2O produced during the discharge process combined with graphene can effectively alleviate the volume expansion of electrode materials and improve the cycle stability [75, 83, 84]. In contrast, Sb2O3 cannot be converted into Na2O during the sodium insertion process, and Sb2O3 itself plays the role of reducing internal stress [85]. As shown in Fig. 7c, Nam and co-workers synthesized 3D porous Sb/Sb2O3 anode materials via a simple electrodeposition project that exhibited a reduced charge capacity by 43.3% from 66 mA/g to 3.3 A/g and maintained 512.01 mA∙h/g after 100 cycles as an anode in SIBs (Fig. 7d). The study found that the Sb2O3 framework can act as a buffer matrix for metal Sb and regulate the internal stress produced by Sb during the charge and discharge processes, thus improving the cyclic stability of electrode materials. In addition, flexible SIB anode materials have also received attention because of the increasing demand for wearable and foldable devices. For instance, Fei et al. [86] constructed a flexible Sb2O3/carbon cloth composite via a simple solvothermal strategy; the carbon cloth has good conductivity, and there is a strong chemical bond between the carbon cloth and the Sb2O3 in this composite hybrid. Unexpectedly, the flexible composite material exhibited a high discharge specific capacity of 1248 mA∙h/g in the first cycle and sustained a high capacity of 900 mA∙h/g over the 100 cycles. Although the composite of antimony oxide and different conductive materials have been studied, a method to produce a composite with various conductive materials in the future and give full play to the advantages of conductive materials remains a problem.
Table 2 exhibits the electrochemical properties of the reported Sb oxides as the anode in SIBs. It is not difficult to find that Sb oxides combined with a variety of conductive matrices can exhibit more robust stability and excellent rate in Na storage; however, this configuration often sacrifices its high specific capacity advantage [87,88,89,90]. Therefore, a heterojunction interface should be employed to compensate for the loss of theoretical capacity, or a combination with other active materials of high theoretical capacity and excellent conductivity to enhance the Na storage capability of Sb-based oxides should be used.
Antimony Sulfides/Selenides for Sodium-Ion Batteries (SIBs)
Theoretically, antimony sulfides and antimony selenides have similar electrochemical reaction mechanisms in the process of sodiation/desodiation, i.e., conversion reaction and alloying reaction during the full charging and discharging processes. Both antimony sulfides and antimony selenides display high theoretical capacity when they are used as an anode in SIBs. The most studied Sb2S3 as a representative reaction process could be expounded by the following formulas [91,92,93]:
In the above reaction, 1 mol of Sb2S3 can cause 12 mol of sodium ions and electrons to participate in the reaction together, resulting in a theoretical capacity of 946 mA∙h/g via this process as an anode in SIBs [7, 17, 18, 20]. Similarly, the widely reported Sb2Se3 also experienced a two-step reaction; the conversion and alloying processes are described in the following equations [94]:
The theoretical capacity of sodium storage contributed by the resulting material of the above two-step reaction is 670 mA∙h/g (1 mol Sb2Se3-9 mol Na+) [7, 17, 18, 20]. Evidently, the theoretical capacity of antimony selenides is less than that of antimony sulfides and oxides and it is equivalent to that of metal Sb.
Antimony sulfides and selenides suffer from several issues when used in sodium storage. For instance, the weak conductivity of antimony sulfides and selenides, unavoidable volume expansion, and even the discharge products (Na2S and Na2Se) can cause the shuttle effect; a similar process occurs in lithium-sulfur batteries [95,96,97,98,99]. In view of these negative phenomena, many strategies have been adopted to alleviate them. Among these strategies, designing a hollow structure is widely used; a similar strategy is used to address issues in the use of the metal Sb. As presented in Fig. 8a, Ge et al. [100] prepared a single-shelled hollow-sphere Sb2S3 coated with carbon via an Oswald ripening process. The single-shelled hollow structure of large void space delivered a capacity of around 700 and 180 mA∙h/g at 0.2 and 6.4 A/g, respectively. Hollow-sphere Sb2S3 maintained 550.8 mA∙h/g over 70 cycles. This performance of the hollow-sphere Sb2S3 is better than that of the unmodified Sb2S3, thus confirming the structural advantages of the single-shelled hollow structure. Inspired by the single-shelled hollow structure, multi-shelled hollow SIB anode materials have been prepared and applied as the anode in SIBs [101,102,103]. For instance, Xie and co-workers [104] reported hollow multi-shelled Sb2S3 (Fig. 8b) formed by synthesizing a zeolitic imidazolate framework 8 (ZIF-8) and exchanging the Sb3+ and Zn2+. This structure has the characteristics of high stability for sodium storage by virtue of the hollow structure and high gravimetric energy density. The hollow multi-level structure material exhibited a reversible capacity of 308 and 116 mA∙h/g at 0.1 and 2 A/g, respectively. Furthermore, compared with pristine Sb2S3, this multiple-shelled structure showed more stable cycle and higher specific capacity. In addition, similar to the improvement strategy for metal Sb, the one-dimensional hollow tube embedded Sb2S3 can also deliver excellent performance in sodium storage because of the one-dimensional high-speed transmission channel and hollow structure that can effectively accelerate charge transfer and relieve internal stress during charging/discharging. Figure 8c shows Sb2S3 multi-walled carbon nanotube composites constructed via precipitation and subsequent thermal treatment [105]. This composite material has a hollow framework with a large specific surface area and large expansion space that can accelerate the charge transfer and effectively buffer the volume expansion when used as an anode for SIBs. The results of charge/discharge of Na+ storage showed a capacity of 442.1 and 339.1 mA∙h/g at 50 and 1000 mA/g, respectively. Clearly, the hollow structure can transfer higher capacity and maintain a stable structure in the repeated sodium insertion and escape process. Nonetheless, the long-term cycle stability of the composite structure with antimony sulfide/selenide requires further improvement.
Another exciting strategy involves the combination of doping and modifying the carbon materials with antimony sulfides and antimony selenides. For example, Liu’s group [106] reported the production of sulfur-doped graphene sheets combined with nanostructured Sb2S3 (Fig. 9a). The doped sulfur in graphene can enhance the electronic coupling between Sb2S3 and graphene by forming strong chemical bonds. With the aid of this chemical bonding, the composite material achieved a high capacity of 792.8 and 591.6 mA∙h/g at 0.05 and 5 A/g, respectively. Moreover, the sample maintained an 83% capacity retention rate after 900 cycles at 2 A/g. As shown in Fig. 9b, Xie and co-workers [107] fabricated silicon–oxygen–carbon nanofibers embedded with Sb2S3 via electrospinning and hydrothermal reaction. The Si–O–C nanofibers accelerate electron and ion transport and alleviate the volume expansion of active substances. Thus, the nanofibers offered a high capacity of 532 mA∙h/g at 0.1 A/g and exhibited a specific capacity of 221 mA∙h/g at 5 A/g for sodium storage. Furthermore, the sample displayed a reversible discharge capacity of 321 mA∙h/g after 200 cycles. As shown in Fig. 9c, Choi et al. [95] designed an amorphous phosphorus/carbon framework embedded with Sb2S3 via a mechanochemical method followed by heat treatment. Doping phosphorus in amorphous carbon can enhance the conductivity of the matrix and prevent the aggregation of active substances in sodium storage. As a result, the sample achieved a reversible capacity of 654 and 390 mA∙h/g at 0.05 and 2 A/g, respectively (Fig. 9d), as well as exhibited a capacity retention rate of 93.4% over 100 cycles at 50 mA/g. Similar to the modification strategy of metal Sb, the silicon–oxygen–carbon (Si–O–C) structure can also replace the traditional pure carbon materials (e.g., graphene, amorphous carbon, and doped carbon) as the reinforcement matrix to combine with Sb2S3, thereby improving the cyclicality and conductivity while inhibiting the volume expansion during the charging/discharging [54]. The use of diverse designs of carbon materials can improve the electrochemical performance of antimony sulfides/selenides. Thus, further modification of the carbon architecture represents a practical pathway for improvements by significantly enhancing ion and electron transport, increasing the capacity of sodium storage, and even inhibiting the aggregation of active substances.
Note that the need for traditional powder electrode materials to be prepared as a slurry in advance makes the process tedious and reduces the tapped density of the cell using a traditional electrode. Moreover, the introduction of binders is detrimental to the Coulombic efficiency during battery operation [108,109,110]. To address these issues, the anode materials of self-supporting for SIBs emerged. Self-supporting electrode materials of antimony sulfides and antimony selenides can avoid the use of additional conductive carbon and binder while exhibiting a high capacity of sodium storage as good as that of powder electrode materials. As a typical example, Lu and co-workers [19], using a facile hydrothermal assembly strategy, demonstrated a self-supported three-dimensional porous graphene foam with Sb2S5 nanoparticles (~ 5 nm) encapsulated in the framework, as displayed in Fig. 10a. The as-prepared composite can be used as an electrode without employing a binder, a conductive agent, and a current collector. Moreover, the stable combination of ultra-small nanoparticles with 3D porous graphene promotes Na+ transfer and electron diffusion. This self-supported electrode delivered the ultrahigh rate capacity of 845 and 525 mA∙h/g at 0.1 and 10 A/g, respectively (Fig. 10b), and sustained 91.6% capacity retention over 300 cycles at 200 mA/g. Similarly, for antimony selenides, Luo et al. [111] synthesized a free-standing membrane with Sb2Se3 nanowires through a facile hydrothermal synthesis and vacuum filtration (Fig. 10c). This free-standing composite of satisfactory flexibility and integrity achieved a reversible capacity of 360 mA∙h/g at 0.1 A/g and maintained 289 mA∙h/g after 50 cycles (Fig. 10d). Although antimony sulfides and antimony selenides have high specific capacities, their poor cycle stability still needs to be improved. In addition, self-supporting flexible antimony sulfur/selenide should also be developed to realize wearable and foldable electronic devices.
Table 3 presents the reported Sb-based sulfides and selenides as anode materials for SIBs and their corresponding electrochemical performance. Although most Sb-based sulfides and selenides electrode materials exhibit high specific capacity in sodium storage, their cycle stability is not ideal [112,113,114,115,116]. In this regard, more attention should be focused on improving their cycle stability during charge and discharge processes.
Antimony-Based Alloy for Sodium-Ion Batteries
In recent years, Sb-based alloys have developed rapidly. The advantage of Sb-based alloys is that the introduction of suitable phases can change the electrochemical properties of Sb and alleviate its volume expansion during the process of sodium storage. In addition, the phase with sodium storage characteristics better cooperates with Sb [117,118,119,120]. Generally, many types of binary Sb-based intermetallic compounds, and even ternary Sb-based alloys, can be synthesized based on the alloy phase diagram. For instance, Farbod and co-workers [121] firstly reported ternary Sn-Ge-Sb thin-film alloys with the particle size of 10–15 nm for SIB anodes. A half battery test of Sn-Ge-Sb showed a rate capacity of 833 and 381 mA∙h/g at 85 and 8500 mA/g, respectively. The cyclic test maintained a specific capacity of 662 mA∙h/g after 50 cycles at 85 mA/g. Such high capacity comes from the interaction between the ternary alloy phases. However, the poor conductivity and the inevitable volume expansion of Sb-based alloys reduce the cycle period during the sodium storage process. Therefore, similar methods for improving the above-mentioned Sb-based materials are also widely utilized in Sb-based alloys.
For example, Liu et al. [122] reported the production of 3D NiSb intermetallic hollow nanospheres via a smart low-temperature crystallization and galvanic replacement reaction (Fig. 11a). This 3D interconnected hollow nanosphere structure possesses many pores that can accommodate the huge volume change and reduce the stress that arises from sodium storage. When used as an anode in SIBs, the NiSb electrode demonstrated a capacity of 201 mA∙h/g at 15 C (Fig. 11b) and showed a discharge capacity of 400, 372, and 230 mA∙h/g at 1, 5, and 10 C over 150 cycles, respectively. Moreover, graphene and RGO are widely used as additives to modify materials because of their excellent conductivity and mechanical strength. As shown in Fig. 11c, Ji and co-workers [123] prepared a composite of SnSb alloy nanoparticles (20–30 nm) and RGO via hydrothermal reaction and thermal reduction. The RGO phase with mechanical flexibility can anchor the SnSb nanoparticles onto its surface. Such composition can effectively inhibit the agglomeration of SnSb alloy, thereby providing excellent conductivity to promote electron and ion transport and adjust the internal stress caused by volume change. The composite electrode exhibited a reversible capacity of 407 and 85 mA∙h/g at 5 and 30 C (Fig. 11d), respectively, and maintained a reversible specific discharge capacity of 361 mA∙h/g over 80 cycles at 0.2 C. One of the key development goals of electrode materials is the self-supporting feature, which was also a goal of the development in Sb-based alloys. As shown in Fig. 11e, Han et al. [124] described an N-doped carbon nanofiber matrix with encapsulated CoSb nanoparticles through the electrospinning method. This self-supporting structure with pseudocapacitive behaviors could obtain fast kinetics and high first Coulombic efficiency for SIB anodes. The CoSb self-supporting structure exhibited a reversible capacity of 703, 648, 559, 541, 445, and 386 mA∙h/g at 0.1, 0.2, 0.5, 0.75, 1.0, and 2.0 A/g, respectively (Fig. 11f). Moreover, this composite electrode held a capacity of 413 mA∙h/g over 1000 cycles at 1 A/g. As another example, Wang et al. [125] reported a binder-free Cu2Sb/Cu electrode via a replacement reaction. Testing of such a self-supporting-like structure with porous Cu2Sb nanoparticle film in SIBs revealed a 98.5% capacity retention rate retained over 200 cycles at 0.8 A/g.
Some research results revealed that Sb-based bimetallic oxides, such as Sb2MoO6 [126] and FeSbO4 [127], can store more Na+ via a continuous conversion and alloying reaction. In particular, because bismuth (Bi) and Sb belong to the same main group in the periodic table of elements, and they have similar physical and chemical properties, Bi and Sb can form a Sb-Bi-based alloy at any molar ratio. In addition, the introduction of Bi into Sb can significantly extend the voltage platform and increase the specific capacity during charging and discharging processes [17, 120, 128].
In summary, Table 4 lists a number of examples of Sb-based alloys as the anode in SIBs and the corresponding key performance metrics [129, 130]. Because the electrochemical performance of most Sb-based alloy materials cannot match the performance of a metal Sb anode in SIBs, more breakthrough explorations are required to address this issue.
Potassium-Ion Batteries
Metallic Antimony for Potassium-Ion Batteries
The PIB is another promising candidate to replace the high-cost lithium-ion battery. Due to the similar reaction mechanism of PIBs and SIBs and the similar ionic radius of K+ and Na+, many modification strategies for Sb-based materials (e.g., metal Sb, oxide, sulfide, selenide, and alloy) have been used to enhance their performance as the anodes of PIBs. However, the Sb-based materials have encountered obstacles as an anode in PIBs that are similar to those of SIBs; these obstacles can be overcome by several classic strategies, such as coupling carbon material, introducing heteroatom dopants, combining with other conductive substrates, synthesizing specific structures, and employing specific electrolytes and binders [131,132,133,134,135,136,137,138,139,140,141,142,143,144,145].
In situ testing technology can reveal the in-depth reaction mechanisms in real time, thereby laying a solid foundation for a deeper understanding of the causes and processes of electrochemical reactions. The reaction mechanism of Sb-based materials has also been studied through the corresponding in situ process in PIBs, such as in situ XRD and in situ TEM [139, 142, 144]. As shown in Fig. 12a, Huang and co-workers[145] employed in situ TEM to reveal the reason that the yolk-shelled Sb-carbon nano-boxes located in the nanowire have an excellent stable cycle (227 mA∙h/g after 1000 cycles at 1 A/g). The pore space derived from the Sb nanoparticles and their surrounding carbon effectively accommodates the entire volume change and maintains the structural integrity. Additionally, optimizing a suitable electrolyte is also beneficial to improving the performance of Sb-based PISs. Studies have found that different electrolytes are likely to have a diametrically opposite difference for the impact of the same material in K-storage [142]. As presented in Fig. 12b, Zhou et al. [143] improved the K-storage ability of Sb alloy via electrolyte engineering. The electrolyte composition (anion, solvent, concentration, etc.) resulted in an excellent performance. Furthermore, the solvent type and anion species can affect the electronegativity of the K+-solvent-anion complex. As a result, the Sb anode without nano-structural engineering and carbon modification exhibited a high capacity of 628 and 305 mA∙h/g at current densities of 0.1 and 3 A/g, respectively, and remained stable over 200 cycles.
Antimony Oxides for Potassium-Ion Batteries
Although the specific mechanism of antimony oxides storing K ions has not been fully studied, this does not prevent us from using them as the anode of PIBs. For example, producing porous structures and introducing heteroatoms are universal approaches to improving the electrodes of PIBs. Recently, our group [141] successfully prepared core-shelled heterostructure Sb@Sb2O3 nanoparticles encapsulated in N-doped hollow porous microspheres via spray drying and heat treatment procedures (Fig. 13). The carbon structure is porous and hollow, and the embedded nanoparticles have a heterogeneous interface between Sb and Sb2O3. The composite architecture showed an excellent rate (474 and 239 mA∙h/g at 0.1 and 5 A/g, respectively) and ultra-long stability (10,000 cycles at 2 A/g) as an anode for PIBs. It can be seen that the synergy between multiple effective strategies can often promote the energy storage application of micro–nano-composite materials in alkaline ion batteries. In this regard, determining how to adjust the balance between different modification systems and giving full play to their advantages will become a key factor in the improvement of PIBs anode materials.
Antimony Sulfides/Selenides for Potassium-Ion Batteries (PIBs)
As a member of a large family of Sb-based materials, the Sb chalcogenides are also studied in PIBs. For example, Yang and co-workers [135] produced Sb2S3/Sb2Se3 nanodots/carbon composites via pyrolysis and co-sulfurization/selenylation process. The S (Se)-doped carbon matrix and ultra-small nanoparticles (Sb2S3/Sb2Se3) can synergistically increase the transport capacity of K+ and alleviate volume expansion. As a result, the Sb2Se3 nanodots/carbon configuration exhibited a reversible capacity of ~ 312 mA∙h/g over 200 cycles at 1 A/g [135]. In addition, because 2D transition metal carbides, carbonitrides, and nitrides (named as MXene) have similar high conductivity and buffer function as carbonaceous materials, they are being adopted widely in the energy storage field. Regarding Sb-based materials in PIBs, Wang et al. [136] constructed self-assembled Sb2S3 nanoflower composite MXene (Ti3C2) flakes using a solvothermal and calcination process. Not surprisingly, the PIBs anode exhibited an outstanding rate performance of 102 mA∙h/g at 2 A/g and maintained 79% capacity retention after 500 cycles at 100 mA/g. Lu and Chen [146] reported that the Sb2S3 nanoparticles could be dispersed in S, N-doped graphene (Sb2S3-SNG) to form a self-supported anode for PIBs. Such nanoparticle architecture not only enhanced the electric conductivity and the mechanical stability but also greatly decreased the inactive weight of the electrode. When assembled with KVPO4F-C, the obtained full cell achieved a high energy density of 166.3 W∙h/kg.
As another element similar to S, the antimonide of selenium (Se) should theoretically exhibit a similar potassium storage capacity. Qian et al. [147] demonstrated a self-templating method to fabricate the Sb2Se3@C microtube. In this work, the hollow structure enabled the Sb2Se3@C to present a capacity of 191.4 mA∙h/g at 500 mA/g after 400 cycles as a PIB anode. The in situ Raman spectra indicated that Sb2Se3@C storage K occurs via a conventional-alloying-type mechanism; the reaction can be described as:
The volume change should be taken into account when designing the PIBs using Sb2Se3 as the anode. In this regard, researchers reported a strategy that applied the self-wrinkled RGO as the matrix to house tiny Sb2Se3 nanoparticles. When used in PIBs, the RGO with high elasticity acted as the buffer to relieve the volume expansion of Sb2Se3. As a result, the Sb2Se3@RGO anode could retain the capacity of 203.4 mA∙h/g at 500 mA/g [148].
Antimony-Based Alloy for Potassium-Ion Batteries
The preparation of Sb-based alloys is also conducive to improving the K-storage when used as battery electrodes. As a typical example, Xiong et al. [139] fabricated a composite porous nanosheet embedded with BiSb alloy nanoparticles through a freeze-drying and pyrolysis process (Fig. 14a, b). The porous two-dimensional carbon material, which effectively relieves the internal stress generated during the potassium storage process, delivered a specific capacity of 320 mA∙h/g over 600 cycles at 0.5 A/g. Furthermore, the anode electrode also exhibited excellent performance in potassium-ion full cells. Using K4Fe(CN)6 (KFC) as the cathode, the full cell (BiSb@C//KFC) showed a voltage plateau at 3.0 V and displayed a high capacity of 396 mA∙h/g. Coincidentally, another project on salt template-directed pore formation was reported by Yang and co-workers (Fig. 14c) [140], in which a series of Swiss-cheese-like nitrogen-doped porous carbon embedded with MSb (M = Ni, Co, or Fe) with M–N–C coordination (Fig. 14d) were generated. The CoSb electrodes presented super discharge capacities of 1214, 1016, 835, 701, 589, 458, and 343 mA∙h/g at 0.1, 0.2, 0.5, 1, 2, 5, and 10 A/g, respectively.
Finally, the related Sb-based materials used as electrodes in PIBs are summarized in Table 5 [149, 150]. Compared with SIBs anode, studies on Sb-based PIBs materials started later and are fewer in number. Therefore, more relevant research is needed, with much progress required before the emergence of self-supporting, high-performance Sb-based electrodes for PIBs.
Conclusion and Perspectives
In this review, we summarized in detail the recent research progress of Sb-based materials, ranging from metal to compounds to alloys, as anodes for SIBs/PIBs. Because these Sb-based materials suffer from the shortcomings of volume change and poor conductivity, we specifically highlighted the general strategies to address these shortcomings, such as reducing the size of Sb-based active materials, introducing carbon materials, designing the core-shelled or hollow structure, and utilizing other stable and conductive protection materials. According to the above strategies, many types of Sb-based materials with nanostructures and diversity morphologies have been reported. Benefit from the high conductivity, high porosity, large specific surface area of the hollow structure, and high degree of protection of the core-shelled structure, these Sb-based materials effectively achieve high-speed ion transfer and electron diffusion, alleviate the internal stress upon cycling, and even promote the penetration of electrolyte into the electrode. Thus, using these Sb-based materials, the specific capacity, the long-term cycle stability, and the rate doubling ability of the electrodes of SIBs/PIBs are greatly improved.
Despite the achievements that have been achieved, challenges still exist in the aspect of exploring the mechanism of energy storage, improving the performance of actual devices, and enhancing the potential of large-scale applications.
First, in terms of the mechanism, the interaction of Sb-based materials with Na/K ions needs to be studied in depth. In particular, Sb oxides and alloy materials react in a complicated manner. Considering the cost, safety, test conditions, and other aspects, it is difficult to explore the reaction process of various materials. Therefore, it is of great significance to establish a reliable database that provides guidance for the effective search of candidate electrode materials and electrolytes; this database will help simplify the subsequent experimental procedures and costs. Moreover, to understand the “black box” mechanisms, researchers need closer in situ analysis methods and more in-depth physical theoretical models to meet this challenge [6, 11, 151,152,153]. Recently, widely used in situ techniques (such as in situ Raman spectroscopy, cryo-electron microscopy, and Fourier infrared spectroscopy) have been used to analyze not only the chemical composition of the SEI film but also the distribution of each element. Therefore, these techniques can be used to effectively help to investigate the side reactions and the role of each solvent in the recycling process. These results can guide us to adopt more effective electrolyte optimization strategies.
On the aspect of battery devices, the biggest problem is the gap between experimental research and practical usage. For example, to the best of our knowledge, almost no Sb-based material has an initial Coulombic efficiency of more than 95%. Furthermore, most of the reported Sb-based materials have not shown satisfied long cycle stability. The solution to this, it is necessary to pay more attention to study the full cell systems of SIBs and PIBs. We must strengthen the research of the mechanism to guide the matching design of the cathode and the anode. In addition, it is required to optimize the assembly process of the full cell so that the potential of Sb-based materials can be fully utilized. Furthermore, the optimization of the electrolyte is an important task for the development of high-performance SIBs/PIBs. For Sb-based electrodes, the suitable electrolyte should meet the following requirements: (1) ability to form a uniform and stable SEI layer; (2) stable chemical properties within the working voltage window.
In addition to the general issues, there are also some challenges under special conditions of use. For example, the high- and low-temperature sodium/potassium storage capacities are an indispensable basic requirement for large-scale fixed energy conversion equipment in the future. Although adequate high-temperature performance is relatively easy to achieve, there are few reports on the low-temperature sodium/potassium storage capacity of Sb-based materials. In contrast, our group studied the low-temperature Na storage behavior of Sb-based materials earlier and obtained relatively good low-temperature stability. Therefore, it will be a long-term opportunity and challenge to study the high/low-temperature properties of Sb-based materials in SIBs/PIBs.
Finally, we must also consider the issue of large-scale applications. The current methods to improve the energy storage performance of Sb-based materials include three aspects: (1) developing the potential of Sb itself, such as changing the alloy composition or building unique nanostructures [154]; (2) introducing composite materials, such as three-dimensional carbon [155, 156]; (3) improving additives, such as adhesives and conductive agents [157]. Indeed, most researchers focus on the structure and morphology modulation, whereas they ignore the feasibility of the preparation strategy in industrial production. Therefore, the development of a low-cost and large-scale synthesis strategy is another urgent need in the practical application of Sb-based materials.
Overall, we hope that this review serves as a reference for research on energy storage related to Sb-based materials and provides guidance for their future development.
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Acknowledgements
The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (Nos. 51771130, 51531004, and 51422104), the Tianjin Youth Talent Support Program, the Tianjin Natural Science Funds for Distinguished Young (No. 17JCJQJC44300), the Tianjin Science and Technology Support Project (No. 17ZXCLGX00060), and the China Postdoctoral Science Foundation (No. 2020M670649).
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Chen, B., Liang, M., Wu, Q. et al. Recent Developments of Antimony-Based Anodes for Sodium- and Potassium-Ion Batteries. Trans. Tianjin Univ. 28, 6–32 (2022). https://doi.org/10.1007/s12209-021-00304-9
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DOI: https://doi.org/10.1007/s12209-021-00304-9