Abstract
The intrinsic sluggish conversion kinetics and severe shuttle effect in lithium—sulfur (Li-S) batteries are responsible for their poor reversible capacity and cycling longevity, which have greatly hindered their practical applications. To address these drawbacks, herein, we design and construct a heterostructured Ni/Ni2P embedded in a mesoporous carbon nanosphere composite (Ni/Ni2P-MCN) for boosting polysulfide catalytic conversion in Li-S batteries. The Ni/Ni2P-MCN-modified separator could not only prevent the shuttle effect significantly through abundant chemical adsorptive sites, but also demonstrate superior catalytic reactivities for the conversion of polysulfides. More importantly, the conductive carbon matrix with an exposed mesoporous structure can serve as an effective physical barrier to accommodate deposited insoluble Li2S. Consequently, the cells with the Ni/Ni2P-MCN-modified separator exhibit greatly boosted rate capability (431 mA h g−1 at 5 C) and cycling stability (a capacity decay of 0.031% per cycle after 1500 cycles). Even at an enhanced sulfur loading of 4.2 mg cm−2, a stable and superior areal capacity (about 3.5 mA h cm−2) has been demonstrated. We envision that the unique Ni/Ni2P heterostructure in the porous carbon matrix could offer great potential for high-performance and sustained energy storage devices.
摘要
锂硫电池固有的缓慢转化动力学和严重的穿梭效应导致其可逆容量和循环寿命差, 严重阻碍了其实际应用. 为了解决这些问题, 我们设计并构建了一种Ni/Ni2P异质结嵌入介孔碳纳米球的复合材料(Ni/Ni2P-MCN), 将其用于锂硫电池隔膜改性以促进多硫化物的催化转化. 研究发现, Ni/Ni2P-MCN改性隔膜可以通过丰富的异质结化学吸附位点吸附多硫化物、抑制穿梭效应, 而且对多硫化物的转化具有优异的催化活性. 此外, 具有暴露介孔结构的导电碳球可以作为物理屏障, 容纳沉积的不溶性Li2S. 因此, 使用Ni/Ni2P-MCN改性隔膜的电池显示出优异的倍率性能(5C下431 mA h g−1)和循环稳定性(1500次循环下平均容量衰减约0.031%). 在4.2 mg cm−2的高载硫下, 输出面积比容量约3.5 mA h cm−2. 我们认为, 这种独特的Ni/Ni2P异质结/多孔碳复合材料在高性能、可持续储能器件中具备巨大的应用潜力.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (52072124), Shanghai Municipal Science and Technology Major Project (2018SHZDZX03), the Natural Science Foundation of Shanghai (20ZR1414900), the Leading Talents in Shanghai in 2018, and the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning and the 111 Project (B14018).
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Author contributions Mao J and Niu D designed and supervised the project, and Mao J performed the experiments and wrote the manuscript under the guidance of Niu D, Li Y and Shi J. Huang G, Jin X, Wei C, and Cai J contributed to the electrochemical tests. All authors contributed to the general discussion.
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Jiayi Mao received his BSc degree from the East China University of Science and Technology (ECUST) in 2017. Now, he is a PhD candidate at the School of Materials Science and Engineering, ECUST. His research interests focus on the synthesis of mesoporous carbon-based composites and their applications for energy storage.
Dechao Niu received his BSc degree from Guilin University of Electronic Technology in 2006. He earned his PhD degree from the School of Materials Science and Engineering, ECUST in 2012. He is now a full professor at ECUST. His research interests include the design and synthesis of block copolymer-based multifunctional nanocomposites and hierarchical mesoporous nanoparticles for biomedical and new energy applications.
Yongsheng Li received his BSc (1994) and PhD (2001) degrees from Zhengzhou Institute of Technology and Dalian University of Technology, respectively. He worked as a postdoctoral fellow in Shanghai Institute of Ceramics, Chinese Academy of Sciences (CAS) and Institut de Recherches sur la Catalyse et l’environnement de Lyon, France. He is now a full professor of ECUST. His recent research interest focuses on the design and controlled synthesis of porous materials and hybrid nanocomposites and their biomedical and catalytic applications.
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Mao, J., Niu, D., Huang, G. et al. A Ni/Ni2P heterostructure in modified porous carbon separator for boosting polysulfide catalytic conversion. Sci. China Mater. 65, 2453–2462 (2022). https://doi.org/10.1007/s40843-021-1982-5
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DOI: https://doi.org/10.1007/s40843-021-1982-5