Realizing Long-Term Cycling Stability of O3-Type Layered Oxide Cathode for Sodium-Ion Batteries

The synergistic regulation of the electronic structure based on Li/Sn co-substitution effectively activates more Ni 2+/3+ and Fe 3+/4+ redox reactions in the high-voltage area and suppresses the redox reactivity of Mn 3+/4+ below 2.5 V.