Preparation of VS 2 /rGO Nanosheet Composite Materials as High Capacity Anodes for Lithium‐ion Batteries

Abstract In the process of ion insertion/deinsertion, VS 2 is prone to volume expansion or even structural collapse leading to capacity decrease and low coulomb efficiency (CE), which hinders its practical application. In this paper, VS 2 /rGO composites were prepared by solvent method. The rGO firmly locks VS 2 in its honeycomb structure, effectively preventing the volume expansion or even structural collapse of the electrode during charging and discharging. The layered structure of VS 2 and the high conductivity of rGO speed up the lithium ion transport and achieve the cycling stability of the battery. The results show that the starting capacity of the VS 2 /rGO anode material is 1190/959 mAh g −1 , and the starting CE is 80.57 %. It is worth noting that after 150 cycles, the specific discharge/charge capacity of the material can be maintained at 764/736 mAh g −1 . The improved electrochemical properties of the VS 2 anode are due to the presence of rGO in the material, thus optimizing the structural stability and electrical properties of the composite.