期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 114, 期 7, 页码 3323-3328出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp911994b
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资金
- K. C. Wong Magna Fund
The electrochemical behaviors and lithium-storage mechanism of LiCoO2, in a broad voltage window (1.0-4.3 V) are Studied by charge-discharge cycling, XRD, XPS, Raman, and HRTEM. It is found that the reduction mechanism of LiCoO, with lithium is associated with the irreversible formation of metastable phase Li1+xCoII O-III(2-y) and then the final products of Li2O and Co metal. During the charging process, the Li2O/Co mixture can be oxidized into CoO, and then the LiO/CoO mixture can result in the formation of Co3O4 in the higher-voltage region. LixCoOy is the final product when the active material is charged to 4.3 V. During the subsequent cycles, the lithium uptake/release reactions ire related to the reversible conversion of Co <-> CoO <-> Co3O4 <-> LixCoOy.
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