Advanced ZnSnS3@rGO Anode Material for Superior Sodium‐Ion and Lithium‐Ion Storage with Ultralong Cycle Life

Abstract A novel and facile approach has been utilized to synthesize zinc tin sulfide@reduced graphene oxide (ZnSnS 3 @rGO) through aqueous reaction of Na 2 SnO 3 and Zn(CH 3 COO) 2 , combined with a subsequent solvothermal reaction and an annealing process. The as‐prepared ZnSnS 3 @rGO nanocomposite exhibited an excellent sodium‐ and lithium‐ion‐storage performance with large specific capacity, high rate capability, and ultralong cycle life. When used in Na‐ion cells, the ZnSnS 3 @rGO nanocomposite delivered a capacity of 472.2 mAh g −1 at 100 mA g −1 and retained a specific capacity of 401.2 mAh g −1 after 200 cycles. In Li‐ion cells, the ZnSnS 3 @rGO nanocomposite delivered a capacity of 959.2 mAh g −1 at a current density of 100 mA g −1 and maintained a specific capacity of 551.3 mAh g −1 at a high current density of 1 A g −1 upon 500 cycles. The electrochemical performance results reveal that the integration of uniformly dispersed metal elements and an interconnected carbon matrix could help release the stress of volumetric excursion and provide fast electron/ion transport, leading to a remarkable electrochemical performance.