Hydrothermal Synthesis of Fe_3O_4@C Spheres as Anode Material for Lithium-Ion Batteries

摘要

Fe_3O_4@C spheres were synthesized by hydrothermal reaction at 190°C followed by a low temperature heat annealing at 600 °C and applied as an anode material for lithium-ion batteries. The samples were characterized by XRD and SEM. The electrochemical performances of as-synthesized Fe_3O_4@C were systemically investigated. A reversible capacity of 873 mAh g~(-1) is obtained in the second cycle at 400 mA g~(-1). More importantly, the discharge specific capacity can still maintain at about 767 mAh g~(-1) after 80 cycles. Moreover, Fe_3O_4@C spheres electrode shows satisfactory rate capability even at a rate up to 2000 mA g~(-1). Thus, the results demonstrate that Fe_3O_4@C spheres show encouraging application potential to be an advanced anode material for lithium storage.