Synthesis and Electrochemical Performance of TiO2/rGO Composites with Different Layers of Graphene Oxide as Anode Materials for Lithium-ion Battery

Abstract

The lithium-ion battery anode materials TiO2/rGO were synthesized from different layers of graphene oxide (GO) and Titanium oxysulfate using hydrothermal method. The structure and morphology were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Their electrochemical performances were tested through galvanostatic charge/discharge and electrochemical impedance spectrum (EIS). The test results show that the TiO2/rGO (few-layers) composites exhibited better electrochemical performance than the TiO2/rGO (multi-layers) composites. At the current density of 100 mA/g, the discharge capacity of TiO2/rGO (few-layers) is 285.3 mAh/g after 100 cycles, and the Coulombic efficiency is still maintained as high as 98.6%, which is superior to that of the TiO2/rGO (multi-layers). TiO2/rGO (few-layers) electrode shows good rate capability and enhanced electrochemical performance compared with the TiO2/rGO (multi-layers) electrode.