High-Entropy Mn/Fe-Based Layered Cathode with Suppressed P2–P′2 Transition and Low-Strain for Fast and Stable Sodium Ion Storage

Mn/Fe-based layered oxides are deemed to be a highly suitable cathode for sodium-ion batteries (SIBs) due to their high capacity and abundant Mn/Fe resources, but they still suffer from a complicated phase transition and large volume variation. To conquer these problems, high-entropy Mn/Fe-based layered oxide P2-Na