Electrochemical study on different layers of graphene based TiO2/graphene composites as an anode for lithium-ion batteries

In order to explore the influence of the layers of graphene on the lithium-ion battery composites, to increase the electroconductivity of TiO2 and electrochemistry performance of materials, titanium dioxide/graphene composites (TiO2/rGO) were synthesized from different layers of graphene oxide (GO) and TiO2 using the hydrothermal method. The morphology and structure were studied by X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy. Their electrochemistry performance was tested through galvanostatic charge-discharge, cyclic voltammetry and AC impedance (EIS). The results indicate that the TiO2/rGO (few-layers) electrode exhibited higher electrochemical performance than that of the TiO2/rGO (multi-layers) electrode regardless of the rate. At the current density of 100mAg(-1), the discharge capacity of TiO2/rGO (few-layers) was 322.3mAhg(-1) after 100 cycles, which was higher than TiO2/rGO (multi-layers) (240.2mAhg(-1)). TiO2/rGO (few-layers) showed reversible capacity values of 285.8mAhg(-1) and 235.6mAhg(-1) at current rates of 160mAg(-1) and 320mAg(-1), respectively, showing better rate performance. [GRAPHICS] .