阴极
扩散
电化学
化学物理
锂(药物)
氧化物
离子
空位缺陷
过渡金属
氧气
电池(电)
冷凝
材料科学
无机化学
金属
化学
物理化学
结晶学
电极
热力学
冶金
催化作用
有机化学
功率(物理)
医学
内分泌学
物理
作者
Sanghan Lee,Wooyoung Jin,Su Hwan Kim,Se Hun Joo,Gyutae Nam,Pilgun Oh,Young‐Ki Kim,Sang Kyu Kwak,Jaephil Cho
标识
DOI:10.1002/anie.201904469
摘要
Abstract Oxygen vacancies (OV) are native defects in transition metal (TM) oxides and their presence has a critical effect on the physicochemical properties of the oxide. Metal oxides are commonly used in lithium‐ion battery (LIB) cathodes and there is still a lack of understanding of the role of OVs in LIB research field. Here, we report on the behavior of OVs in a single‐crystal LIB cathode during the non‐equilibrium states of charge and discharge. We found that microcrack evolution in a single crystal occurs due to OV condensation in specific crystallographic orientations generated by the continuous migration of OVs and TM ions. Moreover, understanding the effects of the presence and diffusion of OVs in metal oxides enables the elucidation of most of the conventional mechanisms of capacity fading in LIBs and provides new insights for new electrochemical applications.
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