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. •Cu-Doped Ring-Shaped Fe2O3 as high-capacity and high-rate anode for lithium-ion batteries.•The Fe2O3 material doped with 3% Cu had the best electrochemical performance, and its specific capacity was 862.6 m Ahg-1 after 100 cycles.•Benefiting from the synergistic effect in the composite, the Cu doped ring-shaped Fe2O3 composite has a high specific capacity and good cycling stability.