Halide‐Ion‐Assisted Synthesis of Different α‐Fe2O3 Hollow Structures and Their Lithium‐Ion Storage Properties

Various α‐Fe2O3 hollow structures, such as wormlike shapes, ellipsoids, and quasicubes, were synthesized successfully by a halide‐ion‐assisted solvothermal method. The self‐assembly assisted by selective absorption of halide ions and Ostwald ripening speeded up by acidic etching commonly determine the final unique structures. The electrochemical performance of the α‐Fe2O3 with different structures in reversible lithium‐ion storage was investigated, and showed that the hollow Fe2O3 quasicubes exhibit the best cycling performance with a charge capacity of 401.6 mAh g−1 after 100 cycles at 0.2 C. The superior cycling stability and high specific capacity can be ascribed to the higher specific surface area, lower charge‐transfer resistance, and adequate alleviation of volume variation.