Metal-to-metal charge transfer for stabilizing high-voltage redox in lithium-rich layered oxide cathodes.

ABSTRACT: Apart from conventional redox chemistries, exploring high-voltage anionic redox processes, such as pure oxygen or high-valent transition metal ion redox, poses challenges due to the instability of O nonbonding or O-dominant energy states. These states are associated with destructive behaviors in layered oxide cathodes, including local structural distortion, cationic disordering, and oxygen gas evolution. In this study, we suppress first-cycle voltage hysteresis and irreversible O₂ evolution in Li-rich oxide cathodes through covalency competition induced by the substitution of electropositive groups. We found that the nonequivalent electron distribution within an asymmetric M_A-O-M_B backbone (metal-to-metal charge transfer via oxygen ligands) increases electr

SUBMITTER: Kim MH 

PROVIDER: S-EPMC11838003 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature