空位缺陷
材料科学
阴极
纳米团簇
化学物理
纳米尺度
氧化物
粒子(生态学)
电子
纳米技术
结晶学
物理化学
冶金
化学
物理
地质学
海洋学
量子力学
作者
Linze Li,Jiangtao Hu,Jie Xiao,Chongmin Wang
标识
DOI:10.1021/acsami.1c02294
摘要
Effects of nanoscale vacancy clusters on the electrochemical properties of cathodes critically depend on the dynamic characteristics of vacancies during the battery cycling. However, a fundamental understanding of vacancy clusters in the layer-structured cathode remains elusive. Here, using scanning transmission electron microscopy, we reveal a cycling-induced vacancy aggregation behavior in a layer-structured cathode. We discover that during the initial charging, vacancies aggregate to form nanoclusters at the outer layer of the secondary particle, which subsequently extend to the inner part of the particle when fully charged. With extended cycling, these nanoscale vacancy clusters become immobilized. We further reveal that the generation of these vacancy clusters is correlated to the material synthesis conditions. Our findings solve a long-standing puzzle on the origin, nature, and behavior of the commonly visible vacancy clusters in the layered cathode, providing insights into correlation between properties and dynamic behaviors of atomic-scale defects in layered oxide cathodes.
科研通智能强力驱动
Strongly Powered by AbleSci AI