Preparation and Electrochemical Performance of 3D Graphene/Manganese Bioxide Composites

• 1、College of Chemistry and Material Science,Langfang Teachers University, Langfang,Hebei 065000

Abstract：Three-dimensional (3D) graphene/manganese bioxide composites (3DG/MnO2) were prepared by hydrothermal reaction, followed by freeze-drying and high temperature activation process with graphene oxide (GO) and manganese bioxide as raw materials. The structure and morphology of the materials were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The combination of graphene and manganese oxide effectively reduces the agglomeration of manganese oxide particles and graphene presenting the 3D networks with porous structure. Lithium ion battery was assembled using this composite as electrode material. The electrochemical performance was measured by constant current charge and discharge, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The specific discharge capacity at current density of 0.1 A/g can reaches 1142.4 mAh/g, and after 100 cycles at current density of 1 A/g, the capacity retention rate is 85.3%. 3DG/MnO2 material shows more excellent electrochemical performance than graphene or MnO2, becoming an ideal electrode material for energy storage devices.

Keywords： graphene manganese bioxide composite materials lithium-ion battery electrochemical performance