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Two-dimensional Fe2O3/TiO2 Composite Nanoplates with Improved Lithium Storage Properties as Anodic Materials for Lithium-Ion Full Cells

Dongyang Qu,Zhonghui Sun,Shiyu Gan,Lifang Gao,Zhongqian Song,Huijun Kong,Jianan Xu,Xiandui Dong,Li Niu

Graphical The 2D structured Fe 2 O 3 /TiO 2 composite nanoplates offers open channels for favorable ion and electron transports. The combination of TiO 2 with a steady structure further provides sufficient volume fluctuation space for Fe 2 O 3 . Fe 2 O 3 /TiO 2 nanoplates as an anode material thus exhibit favorable rate and cycle performances for lithium-ion batteries compared with Fe 2 O 3 . After assembled with LiFePO 4 cathode, the full cell also demonstrates stable cycle capacity (132 mAh g −1 at 0.1 A g −1 after 150 cycles). The rapid capacity decay is one of the challenges for the anodes of metal oxides-based lithium-ion batteries (LIBs). Herein, we report a characteristic nanoplate-structured metal oxide anode consisting of hexagonal Fe 2 O 3 and TiO 2 (denoted as Fe 2 O 3 /TiO 2 ) via a facile hydrothermal strategy. Owing to two-dimensional (2D) structured and stable TiO 2 modifier, Fe 2 O 3 /TiO 2 composite demonstrates significantly improved electrochemical LIBs performances. The Fe 2 O 3 /TiO 2 composite material buffers the volume expansion of Fe 2 O 3 and improves the rate capability and cycling performances. Upon 1000 long-term cycles, the anode electrode delivers high discharge capacity of 1056 mAh g −1 at 0.5 A g −1 . The full cell that is composed of Fe 2 O 3 /TiO 2 as the anode and commercial LiFePO 4 as the cathode delivers superior rate capacity (84 mAh g −1 at 2 A g −1 ) and stable cycle capacity (132 mAh g −1 at 0.1 A g −1 after 150 cycles). This 2D composite nanostructure offers an approach to improve the metal oxide-based anodes of LIBs.