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.