Stabilizing the oxygen anionic redox chemistry using a Li-deficient and Li-rich biphasic structure for high-energy Li-ion batteries.

ABSTRACT: Li-rich layered oxides (LLOs) with a large specific capacity of ∼300 mAh g^-1 show promise for developing high-energy Li-ion batteries (LIBs). However, the thermodynamic instability of the oxygen-anionic redox couple leads to lattice oxygen loss and structural transformation, resulting in a rapid decline in voltage and capacity. In this work, we rationally engineer Li-deficient phase formation in LLOs to stabilize oxygen-anionic redox chemistry and improve structural stability. The Li-deficient and Li-rich biphasic intergrowth composite is synthesized via ion exchange from the P3/O3 intermediate mixed-phase oxides. It is found that the incorporation of the Li-deficient phase makes the movement of the O 2p non-bonding energy band toward lower energy, which further alleviate

SUBMITTER: Li F 

PROVIDER: S-EPMC12512871 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature