S-MnO2/Graphene composites with high electrochemical properties as cathode of aqueous zinc-ion battery

Abstract

MnO2 has been widely studied as cathodes of aqueous zinc-ion batteries(AZIBs). However, its commercialization is constrained by its volumetric expansion, the dissolution of Mn2+ and low electrical conductivity. In this study, a one-step hydrothermal method was used to synthesize sulfur, carbon materials (graphene) and MnO2 composite materials (S-MnO2/Graphene). It obtains a maximum specific capacity of 121.2 mAh g−1 at 1 A/g after 5000 cycles. Sulfur and graphene are perfectly combined with MnO2 as aqueous zinc-ion battery cathodes with good electrochemical performance. This work creates a promising cathode material (S-MnO2/Graphene) for AZIBs.