Fabrication of a Sandwich‐like VS<sub>4</sub>‐Graphene Composite via Self‐assembly for Highly Stable Lithium‐ion Batteries
Hao Zhang, Jiawen Peng, Junpeng Wang, Yuanyuan Ren, Wenjie Zeng, Liang Chen
Abstract
Abstract Vanadium tetrasulfide (VS 4 ) owns a distinctive linear‐chain structure which might provide potential sites for lithium‐ion storage. Although it has drew recent attention as an anode material, issues relevant to cycling stability remain unresolved. In this study, a composite of fine‐sized VS 4 nanoparticles embedded in graphene sheets (VS 4 ‐G) was prepared using a one‐pot hydrothermal route. It was found that the as‐prepared VS 4 ‐G have a sandwich‐like structure obtained via layer‐by‐layer self‐assembly. Electrochemical experiments revealed that the VS 4 ‐G anode maintained a capacity of 667 mA h g −1 after cycling100 times at 0.1 A g −1 . Moreover, the VS 4 ‐G anode achieved highly stable long‐term cycling properties at 1 A g −1 . The synergistic effect between the fine crystal size of VS 4 and the intrinsic adequate electronic properties of graphene facilitated the effortless and rapid lithium‐ion diffusion in the composite; it was also responsible for the excellent electrochemical performance of the VS 4 ‐G anode. In addition, the robust sandwich‐like structure enabled a stable cycling performance of the VS 4 ‐G anode.