High‐Energy Earth‐Abundant Cathodes with Enhanced Cationic/Anionic Redox for Sustainable and Long‐Lasting Na‐ion Batteries

Layered iron/manganese-based oxides are a class of promising cathode materials for sustainable batteries due to their high energy densities and earth abundance. However, the stabilization of cationic and anionic redox reactions in these cathodes during cycling at high voltage remain elusive. Here, an electrochemically/thermally stable P2-Na