• Fe-containing high-entropy oxides (Fe-HEOs) leverage entropy-stabilized multi-cation frameworks to overcome the capacity degradation caused by volume changes in conventional transition-metal oxide anodes.
• The synergistic interaction between electrochemically active Fe and inert stabilizers (Mg, Cr) or transport modulators (Zn, Cu) enables high reversible capacity and durable cyclability, with representative systems retaining >80% capacity after 300 cycles.
• Versatile solid-state, liquid-phase, and gas-phase synthesis routes provide scalable pathways for designing Fe-HEO anodes with tailored composition, morphology, and electrochemical performance.
• Advanced characterization techniques are essential for unraveling composition–structure–performance relationships and guiding the development of low-cost, high-performance Fe-HEO anode materials for next-generation lithium-ion batteries.