Abstract
Lithium-ion capacitors (LICs) of achieving high power and energy density have garnered significant attention. However, the kinetics unbalance between anode and cathode can impede the application of LICs. Vanadium nitride (VN) with a high theoretical specific capacity (~ 1200 mAh·g−1) is a better pseudocapacitive anode to match the response of cathode in LICs. However, the insertion/extraction of Li-ions in VN’s operation results in significant volume expansion. Herein, the VN/N-rGO-5 composite that three-dimentional (3D) dicyandiamide-derived-carbon (DDC) tightly wrapped VN quantum dots (VN QDTs) on two-dimentional (2D) reduced graphene oxid (rGO) was prepared by a facile strategy. The VN QDTs can reduce ion diffusion length and improve charge transfer kinetics. The 2D rGO as a template provides support for nanoparticle dispersion and improves electrical conductivity. The 3D DDC tightly encapsulated with VN QDTs mitigates agglomeration of VN particles as well as volume expansion. Correspondingly, the LICs with VN/N-rGO-5 composite as anode and activated carbon (AC) as cathode were fabricated, which exhibits a high energy density and power density. Such strategy provides a perspective for improving the electrochemical properties of LIC anode materials by suppressing volume expansion and enhancing conductivity.
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摘要
可实现高功率和高能量密度的锂离子电容器(LICs)已引起广泛关注。然而,正极和负极之间的动力学不平衡会阻碍LICs的应用。氮化钒(VN)具有较高的理论比容量(约1200 mAh·g-1),是一种具有良好赝电容性能的负极,可以与LIC中的正极反应相匹配。然而,VN在锂离子插入/抽出过程中伴随着严重的体积膨胀。在此,通过简单的一步热处理策略,制备了在二维还原氧化石墨烯(rGO)上负载了被三维双氰胺衍生碳(DDC)紧密包裹的VN量子点(VN QDTs)复合材料(VN/N-rGO-5)。VN QDTs可以减少离子扩散长度并改善电荷转移动力学。作为模板的二维rGO为纳米粒子的分散提供了保证,并提高了导电性。三维DDC紧密包裹VN,减轻了VN颗粒的聚集和体积膨胀。相应地,组装了以VN/N-rGO-5复合材料为负极、以活性炭(AC)为正极的LIC,其展现了高能量密度和功率密度。就缓解体积膨胀和增强导电性而言,这种策略为提高LIC负极材料的电化学性能提供了一个新方向。
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Acknowledgements
This study was financially supported by the National Natural Science Foundation of China (Nos. 22005167 and 21905152), Shandong Provincial Natural Science Foundation of China (Nos. ZR2020QB125, ZR2020MB045 and ZR2022QE003), China Postdoctoral Science Foundation (Nos. 2021M693256, 2021T140687 and 2022M713249), Qingdao Postdoctoral Applied Research Project, Taishan Scholar Project of Shandong Province of China (No. tsqn202211160) and the Youth Innovation Team Project for Talent Introduction and Cultivation in Universities of Shandong Province.
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Hu, ZW., Li, HF., Wang, P. et al. 2D–3D dual carbon layer confined ultrasmall VN nanoparticles for improving lithium-ion storage in hybrid capacitors. Rare Met. 43, 65–75 (2024). https://doi.org/10.1007/s12598-023-02432-8
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DOI: https://doi.org/10.1007/s12598-023-02432-8