Sustainable LiCoO2 by collective glide of CoO6 slabs upon charge/discharge.
Proc Natl Acad Sci U S A
; 119(20): e2120060119, 2022 May 17.
Article
em En
| MEDLINE
| ID: mdl-35561218
ABSTRACT
SignificanceTraditional views indicate that the well-known layered LiCoO2 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 CoO6 slabs in layered LiCoO2 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.
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MEDLINE
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2022
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Article