Yolk-shell structure Fe2O3@C nanocomposite anode material prepared from the leaching solution of iron concentrate for lithium-ion batteries

Yolk-shell structure Fe ₂ O ₃ @C composite by utilizing the iron concentrate leachate with a selective chemical precipitation method and illustrate its great potential as a high-performance anode material of lithium-ion batteries (LIBs). The Fe ₂ O ₃ @C composite exhibits superior cyclic performance (723.08 mA h g ^− 1 over 300 cycles at 1 A g ^− 1 ) and high-rate capability (322.01 mA h g ^− 1 even at a high current density of 5 A g ^− 1 ) in a half cell. The excellent performance of the Fe ₂ O ₃ @C can be attributed to particles contain abundant internal voids, which facilitates the infiltration of the electrolyte and alleviates the volume change of electrode material, thereby enhancing the electrochemical performance of the material. Due to the unique yolk-shell structure nanostructure, Fe ₂ O ₃ @C composite shows significant pseudocapacitive behavior during discharge/charge processes, which partially accounts for the excellent lithium-ion storage performance.