Gradient and De‐Clustered Anionic Redox Enabled Undetectable O2 Formation in 4.5 V Sodium Manganese Oxide Cathodes

formation suppresses the typical P2-O2 phase transition, resulting in a minimal lattice volume change of only 0.5%. Ex situ neutron diffraction studies and theoretical calculations further elucidate that the locally ordered lattice is well-preserved, attributable to reduced cationic migrations during cycling.