期刊
JOURNAL OF POWER SOURCES
卷 196, 期 16, 页码 6978-6981出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.10.101
关键词
Lithium-ion batteries; Cobalt ferrite; Conversion reaction; Mossbauer spectroscopy
资金
- MICINN [MAT2008-0558]
- Government of Andalusia [FQM1447, FQM288]
The reverse micelles method has been employed to obtain cobalt ferrite samples. The effect of the type of surfactant and volumetric proportion of the aqueous and organic phases on the electrochemical behavior has been evaluated. The sample prepared using Span 80 as a surfactant and equivalent volumes of the aqueous and organic phases showed the highest capacity values and rate capabilities. It has been correlated to the better stability of the faradaic conversion process upon cycling for this sample. Based on the Fe-57 Mossbauer spectra of discharged electrodes, this result has been associated to the preservation of reduced iron atoms into the core of the particles. The metallic atoms are ready to be oxidized, thus sustaining the reversible electrochemical reaction in further cycles. (C) 2010 Elsevier B.V. All rights reserved.
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