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- W2510278010 abstract "Deterioration mechanisms of LiCoO2 electrode materials for lithium ion batteries remain unclear. Using electron energy-loss spectroscopy and transmission electron microscopy, this study investigated chemical states of LiCoO2 particles on first overcharging. We present a scheme for quantification of the Li/Co atomic ratio. Using quantitative Li mapping and comprehensive probing of Li–K, Co–M2,3, Co–L3, and O–K edges, we observed that overcharging causes the progression of Co3+/Co2+ reduction with oxygen extraction from the particle surface to the interior. A gradual change in the chemical composition at and around the particle surfaces after charging of 60% revealed the presence of Co3O4-like and CoO-like phases at surface regions. We also observed nanocracks with deficient Li ions. These results are key factors affecting degradation on overcharging." @default.
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- W2510278010 date "2015-07-01" @default.
- W2510278010 modified "2023-10-14" @default.
- W2510278010 title "Chemical States of Overcharged LiCoO<sub>2</sub> Particle Surfaces and Interiors Observed Using Electron Energy-Loss Spectroscopy" @default.
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- W2510278010 doi "https://doi.org/10.1021/acs.jpcc.5b02303" @default.
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