Core–shell Fe2O3@MnO2 nanoring composites as anode materials for high-performance lithium-ion batteries

The combination of Fe₂O₃ with other transition metal oxides can effectively improve the electrochemical performance of Fe₂O₃. Transition metal oxide MnO₂ was used to modify ring-like Fe₂O₃. Core–shell Fe₂O₃@MnO₂ nanoring composites were synthesized by hydrothermal method. The Fe₂O₃@MnO₂ composite exhibits excellent electrochemical performance in cycling and rate performance tests due to the synergistic effect of the Fe₂O₃ ring and MnO₂ shell. After 100 cycles at 0.1 C current density, the specific discharge capacity can reach 893.6 mAh g⁻¹. After cycling at 2 C high current density, when the current density is restored to 0.1 C, the reversible specific capacity can reach 867.1 mAh g⁻¹. The experimental results show that the core–shell composite with other transition metal oxides can effectively improve the cycle stability and rate performance of Fe₂O₃ anode materials.