TiO2/graphene nanocomposites as anode materials for high rate lithium-ion batteries

A simple strategy to prepare a hybrid of nanocomposites of anatase TiO2/graphene nanosheets(GNS)as anode materials for lithium-ion batteries was reported.The morphology and crystal structure were studied by X-ray diffraction(XRD),field emission scanning electron microscopy(FE-SEM)and transmission electron microscopy(TEM).The electrochemical performance was evaluated by galvanostatic charge–discharge tests and alternating current(AC)impedance spectroscopy.The results show that the TiO2/GNS electrode exhibit higher electrochemical performance than that of TiO2 electrode regardless of the rate.Even at 500 mA/g,the capacity of TiO2/GNS is 120.3 mAh/g,which is higher than that of TiO2 61.6 mAh/g.The high performance is attributed to the addition of graphene to improve electrical conductivity and reduce polarization.