▎ 摘　　要

Vanadium tetrasulfide (VS4) 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 VS4 nanoparticles embedded in graphene sheets (VS4-G) was prepared using a one-pot hydrothermal route. It was found that the as-prepared VS4-G have a sandwich-like structure obtained via layer-by-layer self-assembly. Electrochemical experiments revealed that the VS4-G anode maintained a capacity of 667 mA h g(-1) after cycling100 times at 0.1 A g(-1). Moreover, the VS4-G anode achieved highly stable long-term cycling properties at 1 A g(-1). The synergistic effect between the fine crystal size of VS4 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 VS4-G anode. In addition, the robust sandwich-like structure enabled a stable cycling performance of the VS4-G anode.