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α-Fe 2 O 3  has high potential energy storage capacity and can serve as a green and low-cost anode material for lithium-ion batteries. However, α-Fe 2 O 3  suffers large volume expansion and pulverization. Based on DFT calculations, TiO 2  can effectively maintain the integrity of the crystal structure during the discharge/charge process. Well-defined cubic α-Fe 2 O 3  is coated with a TiO 2  layer using the hydrothermal method with the assistance of oxalic acid surface treatment, and then α-Fe 2 O 3 @TiO 2  with tunable buffer chambers is obtained by altering the hydrochloric acid etching time. With the joint efforts of the buffer chamber and the robust structure of the TiO 2  layer, α-Fe 2 O 3 @TiO 2  alleviates the expansion of α-Fe 2 O 3  during the discharge/charge process. The optimized sample (FT-1h) achieves good cycling performance. 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 . Furthermore, the reversible specific capacity can return to 555.5 mA h g −1  at 100 mA g −1  after cycling at a high current density. Hence, the buffer chamber and the robust TiO 2  layer can effectively improve the cycling stability and rate performance of α-Fe 2 O 3 .

Robust α-Fe2O3@TiO2 Core–Shell Structures With Tunable Buffer Chambers for High-Performance Lithium Storage