Conversion mechanisms of cobalt oxide anode for Li-ion battery: In situ X-ray absorption fine structure studies

Co sub(3)O sub(4) powders as anode active materials for Li-ion battery are synthesized by a simple precipitation method. Physical properties of the prepared Co sub(3)O sub(4) are characterized by N sub(2) physisorption, transmission electron microscopy, and X-ray diffraction. Conversion mechanisms u...

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Bibliographic Details
Published in:Journal of power sources 2015-01, Vol.274, p.748-754
Main Authors: Chae, Byung-Mok, Oh, Eun-Suok, Lee, Yong-Kul
Format: Article
Language:English
Subjects:
Anodes
Charge
Conversion
Discharge
Fine structure
Lithium-ion batteries
Physical properties
Precipitation
X-rays
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Summary:Co sub(3)O sub(4) powders as anode active materials for Li-ion battery are synthesized by a simple precipitation method. Physical properties of the prepared Co sub(3)O sub(4) are characterized by N sub(2) physisorption, transmission electron microscopy, and X-ray diffraction. Conversion mechanisms upon the structural changes of Co sub(3)O sub(4) anode are thoroughly studied by an in situ X-ray absorption fine structure (XAFS) technique. In the first cycle of discharge/charge, the X-ray absorption near-edge structure of Co reveals that the 1.1 V plateau of the discharging is ascribed to the direct conversion of Co sub(3)O sub(4) to Co metal, and the 2.0 V plateau of the charging to the conversion of Co metal to CoO and Co sub(3)O sub(4). In the second cycle of discharge/charge, the XAFS analysis reveals that a part of Co metal phase remains unconverted due to the phase isolation. It is demonstrated that the addition of a conductive material can significantly improve the redox reaction of the Co sub(3)O sub(4) anode material by minimizing the phase isolation.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2014.10.108