High lithium storage performance of Co-Fe2O3 materials with different cobalt doping contents as negative electrode materials for lithium-ion batteries

The practical application of Fe2O3 as the anode material in LIBs is greatly hindered by several severe issues, such as drastic capacity falloff, short cyclic life, and huge volume change during the charge/discharge process. To tackle these limitations, cobalt-doped mesoporous Fe2O3 nanoparticles were successfully synthesized using the hydrothermal method. The mesoporous structure can alleviate the volume expansion and stress during the charge-discharge process and improve cycle stability. When Co-Fe2O3(1:1) is used as the anode of a lithium-ion battery, the first discharge capacity is 873.20 mAh g(-1) at a current density of 50 mA g(-1). Under a current density of 200 mA g(-1), after 100 charge-discharge cycles, the specific discharge capacity of Co-Fe2O3(1:1) reached 576.12 mAh g(-1), with the Coulombic efficiency still maintained at 97.83%. Therefore, Co-Fe2O3(1:1) has great potential as an anode material for high-performance lithium-ion batteries.