The reversible specific capacity remains at 893.7 mA h g -1, and the Coulombic efficiency still reaches up to 98.47% after 150 cycles at a current density of 100 mA g −1. The optimized sample (FT-1h) achieves good cycling performance. With the joint efforts of the buffer chamber and the robust structure of the TiO 2 layer, α-Fe 2O 2 alleviates the expansion of α-Fe 2O 3 during the discharge/charge process. Well-defined cubic α-Fe 2O 3 is coated with a TiO 2 layer using the hydrothermal method with the assistance of oxalic acid surface treatment, and then α-Fe 2O 2 with tunable buffer chambers is obtained by altering the hydrochloric acid etching time. Based on DFT calculations, TiO 2 can effectively maintain the integrity of the crystal structure during the discharge/charge process. However, α-Fe 2O 3 suffers large volume expansion and pulverization. Α-Fe 2O 3 has high potential energy storage capacity and can serve as a green and low-cost anode material for lithium-ion batteries. 6School of Environment, Henan Normal University, Xinxiang, China.5Collage of Pharmacy, College of Biomedical Engineering, Xinxiang Medical University, Xinxiang, China. ![]() 4School of Mechanical and Electrical Engineering, Xinxiang University, Xinxiang, China. ![]()
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