材料科学
阴极
氧气
尖晶石
离子
化学物理
化学工程
氧化物
锂(药物)
动力学
化学
物理化学
内分泌学
有机化学
冶金
工程类
物理
医学
量子力学
作者
Chaofan Li,Kangning Zhao,Xiaobin Liao,Zhi‐Yi Hu,Lei Zhang,Yan Zhao,Sai Mu,Yanxi Li,Yu Li,Gustaaf Van Tendeloo,Congli Sun
标识
DOI:10.1016/j.ensm.2020.12.018
摘要
The irreversible release of the lattice oxygen in layered cathodes is one of the major degradation mechanisms of lithium ion batteries, which accounts for a number of battery failures including the voltage/capacity fade, loss of cation ions and detachment of the primary particles, etc. Oxygen release is generally attributed to the stepwise thermodynamic controlled phase transitions from the layered to spinel and rock salt phases. Here, we report a strong kinetic effect from the mobility of cation ions, whose migration barrier can be significantly modulated by the phase epitaxy at the degrading interface. It ends up with a clear oxygen release heterogeneity and completely different reaction pathways between the thin and thick areas, as well as the interparticle valence boundaries, both of which widely exist in the mainstream cathode design with the secondary agglomerates. This work unveils the origin of the heterogenous oxygen release in the layered cathodes. It also sheds light on the rational design of cathode materials with enhanced oxygen stability by suppressing the cation migration.
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