MnO2-decorated graphene oxide nanosheet composites as promising electrode materials for lithium-ion battery energy storage applications

Abstract

This study reports the synthesis of graphene oxide nanosheets (GNs) through a simple one-step electrochemical exfoliation method, followed by the decoration of manganese dioxide (MnO₂) on the GNs using a fast, straightforward wet-chemical process. The results show that MnO₂ nanosheets are uniformly dispersed on the surface of the graphene oxide, preventing the aggregation of the nanosheets. Among the samples tested, the GM005 composite exhibited the best performance, demonstrating a specific capacity of 382.1 mA h g⁻¹ after 100 cycles at 0.5 A g⁻¹, making it a promising anode material for lithium-ion batteries. The enhanced electrochemical performance of the GNs@MnO₂ composite is attributed to the synergistic effect between the highly conductive graphene oxide nanosheets and flower-structure MnO₂. These findings suggest that GNs@MnO₂ could be a viable electrode material for advanced lithium-ion battery technologies.