Hydrothermally Synthesized ZnMn₂O₄@GO Cathode Enhances Zinc‐Ion Kinetics and Cycling Stability for Aqueous Zinc‐Ion Batteries

Abstract

Abstract Spinel‐type ZnMn 2 O 4 has been identified as a cathode that demonstrates considerable potential material for zinc‐ion batteries (ZIBs). In this study, the synthesis of ZnMn 2 O 4 @GO composite material was conducted using a hydrothermal method. The electrochemical performance of the composite material was found to be significantly enhanced, a phenomenon that was primarily ascribed to the substantial specific surface area and exceptional conductivity of graphene, which improved the diffusion kinetics of zinc ions at the electrode–electrolyte interface. At a current density of 50 mA g −1 , the discharge capacity of the ZnMn 2 O 4 @GO composite electrode was 186.4 mAh g −1 , much higher than that of ZnMn 2 O 4 (133.3 mAh g −1 ). Moreover, after 1000 charge–discharge cycles at a current density of 1000 mA g −1 , the discharge capacity of ZnMn 2 O 4 @GO composite electrode was 50% higher than that of ZnMn 2 O 4 .