Chemical States of Overcharged LiCoO2 Particle Surfaces and Interiors Observed Using Electron Energy-Loss Spectroscopy

Chemical States of Overcharged LiCoO2 Particle Surfaces and Interiors Observed Using Electron Energy-Loss Spectroscopy

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...

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Veröffentlicht in:Journal of physical chemistry. C 2015-07, Vol.119 (28), p.15823-15830
Hauptverfasser: Kikkawa, Jun, Terada, Shohei, Gunji, Akira, Nagai, Takuro, Kurashima, Keiji, Kimoto, Koji
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container_issue 28
container_start_page 15823
container_title Journal of physical chemistry. C
container_volume 119
creator Kikkawa, Jun
Terada, Shohei
Gunji, Akira
Nagai, Takuro
Kurashima, Keiji
Kimoto, Koji
description 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.
doi_str_mv 10.1021/acs.jpcc.5b02303
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title Chemical States of Overcharged LiCoO2 Particle Surfaces and Interiors Observed Using Electron Energy-Loss Spectroscopy
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