Facile hydrothermal synthesis of SnCoS4/graphene composites with excellent electrochemical performance for reversible lithium ion storage

Abstract

An SnCoS₄/graphene composite is synthesized via a one-step hydrothermal route. Characterizations reveal that such composite consists of SnCoS₄ hybrid nanocrystals with small and uniform sizes, which are well dispersed on graphene. The electrochemical lithium storage measurements demonstrate that the SnCoS₄/graphene composite exhibits a high reversible capacity of 1396 mA h g⁻¹ at 100 mA g⁻¹ and enhanced rate capability of 1145 mA h g⁻¹ at 1000 mA g⁻¹. In particular, a reversible capacity of 940 mA h g⁻¹ can be retained after 2000 cycles at a high current density of 2000 mA g⁻¹, indicating its excellent cyclic stability. The SnCoS₄/graphene composite prepared in this work is promising as the host electrode material for high-performance lithium ion batteries.