Sodium-ion batteries are emerging as a promising alternative to lithium-based systems for large-scale energy storage, but their energy density has long been limited by the shallow redox activity of iron in layered oxide cathodes. A new materials design strategy now demonstrates that iron can contribute far more charge than previously thought. By deliberately altering the balance of transition metals, researchers unlocked a much deeper iron redox reaction, enabling significantly higher reversible capacity and energy density. The redesigned cathode combines enhanced electrochemical activity with structural stability, wide-temperature operability, and improved durability, offering a practical pathway toward next-generation sodium-ion batteries with performance levels once considered unattainable.
Unlocking Hidden Iron Power Boosts Sodium-Ion Battery Performance
