Graphene-strengthened ternary Sn-based sulfide as advanced lithium storage material

Ternary Sn-based sulfide materials are generally considered as potential candidate anode for next-generation lithium-ion batteries (LIBs) owing to their high capacity and superior ion/electrical conductivity. In the work, we successfully prepared the multiphase Cu 4 SnS 4 /CuS/SnS (CTS) nanoparticles uniformly anchored in the reduced graphene oxide (RGO) sheets (CTS/RGO). The CTS/RGO composite exhibits superior cycling stability with negligible capacity decay under a current density of 200 mA g −1 as well as favorable rate capability compared with that of bare CTS particles. The improved electrochemical performance can be attributed to the existence of RGO as a buffer to restrain the huge volume variation during the charge/discharge processes, enhancing the conductivity and diffusion kinetics of Li + in the composite. This work highlights the strengthening effect of RGO for the Li storage properties of Sn-based sulfides, which is beneficial to guide these composites with good electrochemical performances.