Lattice-Distortion-Driven <i>In Situ</i> Formation of Coherent Structural Bands Lithium-Rich Oxides as Lithium-Ion Battery Cathodes

Lithium-rich oxides (LROs) offer theoretical energy densities exceeding 1000 Wh kg–1. Nonetheless, their poor electron/ion conduction properties, as well as severe structural instability during high-voltage cycling, result in limited capacity and rapid performance degradation. Herein, coherent spinel structure bands are in situ constructed in the LRO matrix by lattice distortion relaxation after initial activation. These bands significantly enhance Li+ and electron transport while mitigating cyclic stress through coherent effects. As a result, the modified LRO delivers a specific capacity of 294 mAh g–1 at 0.1C, with an initial energy density reaching 1049.6 Wh kg–1. Furthermore, it shows a capacity retention of 90.5% after 500 cycles at 1 C. This study demonstrates lattice coherent engineering driven by distortion relaxation as an effective strategy for developing lithium-ion battery cathodes.