Improved capacity and rate capability of Fe2O3 modified Li4Ti5O12 anode material

Spinel Li4Ti5O12/Fe2O3 composites were prepared by a facile hydrolysis method combined with further heat-treatment. The structure and electrochemical performance of the Li4Ti5O12/Fe2O3 material were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and charge-discharge tests. Electrochemical measurements demonstrated that the Fe2O3 modified Li4Ti5O12 anode material showed obviously improved high rate performance with discharge capacity of 109.4 mA h/g at 10 C. The Li4Ti5O12/Fe2O3 anode also showed superior cycling stability with an initial discharge capacity of 145.3 mA h/g at 2 C rate and maintained 93% of its initial capacity after 300 cycles. (C) 2013 Elsevier B.V. All rights reserved.