Exploring a phase-compatible surface engineering for enhancing the structural stability in Li-rich layered oxides

doi:10.1016/j.jmst.2025.06.020

Abstract

Abstract: Li-rich layered oxides (LLOs) show tremendous potential as cathode materials for next-generation Li-ion batteries (LIBs) due to their high energy density and cost-effectiveness. However, several challenges, including lattice oxygen release, interface side reactions, and structural transitions, lead to rapid performance degradation, which limits their widespread application. To address these issues, a phase-compatible spinel Li_1.25Cr_0.25Ti_1.5O₄ (LCTO) coating layer on LLOs, as well as Cr³⁺ and Ti⁴⁺ surface co-doping, is successfully constructed. Based on the synergetic effect of the coating and co-doping, we intend to effectively enhance the structure stability and electrochemical performance upon cycling. Consequently, the optimized LLOs-LCTO-1 exhibits a capacity retention of 85.6 % and a voltage decay of 0.309 mV cycle^-1 after 500 cycles at 1 C. In addition, an excellent rate capacity of 163.5 mAh g^-1 is delivered at 5 C. This study provides a promising solution for enhancing the performance and stability of LLOs, paving the way for their broader application in LIBs.

Key words: Li-rich layered oxides, Phase-Compatible Engineering, Li-ion batteries, Electrochemical performance

Errui Wang, Jing Yue, Hailiang Chu, Longde Duan, Jing Tang, Zhenzhen Hui, Xiangju Ye, Xu Zhang, Haijun Yu. Exploring a phase-compatible surface engineering for enhancing the structural stability in Li-rich layered oxides[J]. J. Mater. Sci. Technol., 2026, 250: 165-174.

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