期刊
JOURNAL OF POWER SOURCES
卷 274, 期 -, 页码 748-754出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.10.108
关键词
Anode; Cobalt oxide; In situ X-ray absorption fine structure; X-ray absorption near-edge structure; Direct conversion
资金
- Dankook University
Co3O4 powders as anode active materials for Li-ion battery are synthesized by a simple precipitation method. Physical properties of the prepared Co3O4 are characterized by N-2 physisorption, transmission electron microscopy, and X-ray diffraction. Conversion mechanisms upon the structural changes of Co3O4 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 Co3O4 to Co metal, and the 2.0 V plateau of the charging to the conversion of Co metal to CoO and Co3O4. 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 Co3O4 anode material by minimizing the phase isolation. (C) 2014 Elsevier B.V. All rights reserved.
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