Coralloid Fe₂O₃/MgFe₂O₄ composite was synthesized via a simple gel-cast method.

It exhibits excellent electrochemical performance as anode material for LIBs.

The capacity stabilizes at 1700 mAh g⁻¹ after 500 cycles at 1 A g⁻¹.

Even cycled at 20 A g⁻¹, a capacity of 760 mAh g⁻¹ can still be achieved.