Porous TiO2/Fe2O3 nanoplate composites prepared by de-alloying method for Li-ion batteries

TiO2 anode presents a stable cycling performance but relatively low theoretical capacity, which has hindered its applications in high-performance Li-ion batteries (LIBs). For improving the Li storage properties, novel TiO2/Fe2O3 composite with a porous "slice on slice" structure was prepared via a facile de-alloying method. The composite delivers a reversible capacity of 838.8 mAh g(-1) after 400 cycles at a current density of 200 mA g(-1) and maintaining a discharge capacity of 339 mAh g(-1) even at 2 A g(-1). The improved Li storage property could be ascribed to the synergistic effects of the two active materials. Especially, the reduction products of Fe-0 at the interface between TiO2 and Fe2O3 can facilitate the reversibility of reactions and further result in a high reversible capacity. (C) 2017 Elsevier B.V. All rights reserved.