质子化
阴极
材料科学
电解质
溶解
氧化物
过渡金属
化学物理
相变
多孔性
相(物质)
离子
无机化学
化学工程
化学
有机化学
复合材料
物理化学
热力学
冶金
电极
物理
工程类
催化作用
作者
Biwei Xiao,Yu Zheng,Miao Song,Xiang Liu,Gi‐Hyeok Lee,Fred Omenya,Xin Yang,Mark H. Engelhard,David Reed,Wanli Yang,Khalil Amine,Gui‐Liang Xu,Perla B. Balbuena,Xiaolin Li
标识
DOI:10.1002/adma.202308380
摘要
Abstract Protonation of oxide cathodes triggers surface transition metal dissolution and accelerates the performance degradation of Li‐ion batteries. While strategies are developed to improve cathode material surface stability, little is known about the effects of protonation on bulk phase transitions in these cathode materials or their sodium‐ion battery counterparts. Here, using NaNiO 2 in electrolytes with different proton‐generating levels as model systems, a holistic picture of the effect of incorporated protons is presented. Protonation of lattice oxygens stimulate transition metal migration to the alkaline layer and accelerates layered‐rock‐salt phase transition, which leads to bulk structure disintegration and anisotropic surface reconstruction layers formation. A cathode that undergoes severe protonation reactions attains a porous architecture corresponding to its multifold performance fade. This work reveals that interactions between electrolyte and cathode that result in protonation can dominate the structural reversibility/stability of bulk cathodes, and the insight sheds light for the development of future batteries.
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