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

Abstract

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.

Keywords

TiO₂ / graphene nanosheets / lithium-ion batteries / anode materials

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