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 TiO 2 and electrochemistry performance of materials, titanium dioxide/graphene composites (TiO 2 /rGO) were synthesized from different layers of graphene oxide (GO) and TiO 2 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 TiO 2 /rGO (few-layers) electrode exhibited higher electrochemical performance than that of the TiO 2 /rGO (multi-layers) electrode regardless of the rate. At the current density of 100 mA g −1 , the discharge capacity of TiO 2 /rGO (few-layers) was 322.3 mAh g −1 after 100 cycles, which was higher than TiO 2 /rGO (multi-layers) (240.2 mAh g −1 ). TiO 2 /rGO (few-layers) showed reversible capacity values of 285.8 mAh g −1 and 235.6 mAh g −1 at current rates of 160 mA g −1 and 320 mA g −1 , respectively, showing better rate performance. Graphical abstract