Toward Stable, High-Energy, Partially Disordered Mn-Rich Spinel Cathodes by Revealing and Mitigating Surface Degradation.

ABSTRACT: Mn-rich cathodes balance performance and sustainability but suffer from limited cyclability due to Mn dissolution and cathode-to-anode crosstalk. The Jahn-Teller (J-T) effect of Mn³⁺ is often linked to the above phenomena, such as in spinel LiMn₂O₄. However, in typical voltage ranges, significant Mn³⁺ only appears near the end of discharge, highlighting the need to reassess its role in driving Mn dissolution, structural degradation, and battery performance. Here, the spinel cathode's degree of disorder is tailored to expand the Mn redox range, enabling segmentation into J-T active and less active voltage ranges. Cycling at segmented voltage windows reveals surface degradation mechanisms with and without the major J-T effect. Despite a stronger J-

SUBMITTER: Xia D 

PROVIDER: S-EPMC12392868 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature