Stabilizing oxygen by high‐valance element doping for high‐performance Li‐rich layered oxides

Lithium-rich layered oxides (LLOs) with high energy density and low cost are regarded as promising candidates for the next-generation cathode materials lithium-ion batteries (LIBs). However, there still some drawbacks of LLOs such oxygen instability irreversible structure reconstruction, which seriously limit their electrochemical performance practical applications. Herein, high-valence Ta doping is proposed to adjust electronic structures transition metals, form strong Ta-O bonds reduce covalency Ni-O bonds, thereby stabilizing lattice enhancing structural/thermal stabilities during cycling. As a result, optimized Ta-doped LLO can deliver capacity retention 80% voltage decay 0.34 mV cycle−1 after 650 cycles at 1C. This study enriches fundamental understanding adjustment contributes optimization high-energy LIBs.