Sustainable LiCoO 2 by collective glide of CoO 6 slabs upon charge/discharge

作者：Shuai Li, Yang Sun, Ang Gao, Qinghua Zhang, Xueyi Lu, Xia Lu · 发表于：Proceedings of the National Academy of Sciences · 年份：2022 · DOI：10.1073/pnas.2120060119 · 被引用次数：63 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Supercapacitor Materials and Fabrication

Significance Traditional views indicate that the well-known layered LiCoO 2 cathode delivers a typical solid-solution reaction upon delithiation. The problem is that “solid solution” is a vague concept, and the phase transition remains ambiguous. Here, we reveal a mechanism with the collective and quasi-continuous glide of CoO 6 slabs in layered LiCoO 2 through combining in situ XRD and ex situ STEM characterizations. Such a delithiation mechanism does not involve the nucleation-and-growth-type delithiation process and represents a completely different manner from the conventional two-phase or solid solution–phase transition processes. The lessons provide a different insight into understanding the working mechanism of layered oxide materials.