One-step synthesis of graphene-wrapped ZnS-MoS2@carbon composites as an ultrastable lithium storage anode material

Abstract

Hybrid-structured coupling metal dichalcogenides with carbon materials serve as prospective anode materials for lithium-ion batteries (LIBs) due to their high electrical conductivity, rich active sites, and Li+ diffusion path for Li+ storage. In the present work, graphene-wrapped ZnS−MoS2@carbon composites (ZnS−MoS2/rGO@C) are synthesized via high-temperature mixing during the hydrothermal and carbonation processes. The as-prepared ZnS−MoS2/rGO@C composites display alleviated volume change in the electrochemical process, increased Li+ diffusion speed, and improved conductivity, which are caused by the synergic effect of phase boundaries and hierarchical construction. Therefore, the ZnS−MoS2/rGO@C composites show superior lithium storage capacity and structure stability, and possess ultrastable cycle (581.0 mAh g−1 after 500 cycles at 1 A g−1) and good rate performance (310.7 mAh g−1 at 5 A g−1). This work confirms that anode materials with a hybrid structure can be rationally engineered for high-performance LIBs with superior cycle durability and good rate capability.