Enhanced Electrochemical Properties of γ-MnS@rGO Composite as Anodes for Lithium-Ion Batteries

Abstract

Manganese sulfide (MnS) is a metal chalcogenide with a high theoretical capacity (616 mAh g(-1)) and can be used as an alternative anode material for lithium-ion batteries. Generally, metal chalcogenides have intrinsic limitations, such as low stability resulting from volume expansion and poor electronic conductivity. Herein, the authors propose a synthesis strategy of nano-sized ?-MnS, and one-step composite process by the growth of nanoparticles on the surface of reduced graphene oxide (rGO). These strategies can effectively prevent particle aggregation and enhance an electrochemical stability. The electrochemical performance of the ?-MnS@rGO composite was evaluated using cyclic voltammetry (CV) and galvanostatic charge and discharge measurements. The results showed that the ?-MnS@rGO composite delivered a high specific capacity (624 mAh g(-1) at 0.5 A g(-1) after 100 cycles), good cycling stability, and excellent rate capability compared to bare ?-MnS.