The novel amorphous SnSx/RGO anode material with better cycling stability and superior rate performance

Abstract

A hybrid anode based on SnSx composited with reduced graphene oxide (RGO) is the most promising alternative material for the next generation lithium-ion batteries. In this work, we synthesized a novel amorphous SnSx/RGO (a-SnSx/RGO) by a facile hydrothermal method. A-SnSx/RGO exhibits an excellent lithium-ion storage capacity. After 100 cycles the discharge and charge capacity are 562.5 and 546.6 mAhg−1 at a current density of 100 mAg−1. It also exhibits a superior rate performance. When the current density increased to 1000 mAg−1 the reversible capacity was 357.8 mAhg−1. This superior lithium-ion storage performance is attributed to the amorphous structure and the existence of RGO. The amorphous structure could reduce the volume change effect during the discharge and charge process. Graphene with high specific surface area acted as the frame in composite material and can reduce lithium ions’ diffusion length and time. What is the most interesting is the existence of strong coupling effect in A-SnSx/RGO which make the interface reaction more faster and more easier. This amorphous material provide a new way for optimizing the cycling stability and improving the rate performance, which is important for the development of high performance electrode materials [1].