Abstract
AbstractIn the process of ion insertion/deinsertion, VS2 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, VS2/rGO composites were prepared by solvent method. The rGO firmly locks VS2 in its honeycomb structure, effectively preventing the volume expansion or even structural collapse of the electrode during charging and discharging. The layered structure of VS2 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 VS2/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 VS2 anode are due to the presence of rGO in the material, thus optimizing the structural stability and electrical properties of the composite.
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