Reconstruction of R 3¯ m Disordered Phase Homogenizing Li + Distribution Toward Mitigating H2‐H3 Phase Transition in LiNi 0.95 Co 0.02 Mn 0.03 O 2

, and 83% after 900 cycles in all-solid-state battery system. This work clarifies the "double-edged" nature of cation disorder and provides a structurally stable, lattice-matched interface design scheme for ultrahigh nickel content layered cathodes.