Cu-doped ring-shaped Fe2O3 as high-capacity and high-rate anode for lithium-ion batteries

In this paper, ring-shaped Fe₂O₃ anode materials were modified by using ion doping. Ring-shaped Fe₂O₃ anode materials doped with different concentrations of Cu were prepared by hydrothermal method. The overall morphology of ring-shaped Fe₂O₃ did not change after Cu doped while the lattice deformation led to the generation of more oxygen vacancies and thus enhanced the lithium storage capacity. The Cu doped ring-shaped Fe₂O₃ showed excellent cycling and multiplicity performance, and the Fe₂O₃ material with 3 % Cu doped had the best electrochemical performance, with a specific capacity of 862.6 mAh g⁻¹ after 100 cycles at a current density of 0.1C and a better multiplicity performance. The experimental results indicated that the electrochemical performance of Fe₂O₃ anode materials can be effectively improved by ion doping.