Monodisperse Fe3O4 and γ-Fe2O3 Magnetic Mesoporous Microspheres as Anode Materials for Lithium-Ion Batteries

Monodisperse Fe3O4 and gamma-Fe2O3 magnetic mesoporous microspheres are prepared via a surfactant-free solvothermal combined with precursor thermal transformation method. The as-prepared Fe3O4 and gamma-Fe2O3 magnetic mesoporous microspheres have a relatively high specific surface area of 122.3 and 138.6 m(2)/g, respectively. The Fe3O4 and gamma-Fe2O3 magnetic mesoporous microspheres are explored as the anode materials for lithium-ion batteries, and they have a high initial discharge capacity of 1307 and 1453 mA h/g, respectively, and a good reversible performance (450 mA h/g for Fe3O4 and 697 mA h/g for gamma-Fe2O3 after 110 cycles) at the current density of 0.2C.