期刊
JOURNAL OF POWER SOURCES
卷 196, 期 16, 页码 6893-6897出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.12.095
关键词
Lithium-ion battery; Amorphous FePO4; Mossbauer spectroscopy; Lithiation
资金
- NSERC
- Phostech Lithium
- Industrial Research Chair program
LiFePO4 was prepared using two synthetic routes which involved the precipitation and lithiation of an amorphous FePO4 precursor followed by a thermal treatment. Both hydrated and dehydrated FePO4 were used. The XRD patterns confirm the amorphous nature of both the precipitated and the lithiated product, while a crystalline LiFePO4 product is obtained after thermal treatment. Mossbauer spectroscopy was used to analyse the oxidation state of iron during various stages of the reaction. The Mossbauer data demonstrates a large amount of Fe3+ ions in the lithiated samples which suggest that the lithiation reaction does not go to completion. Therefore, the formation of LiFePO4 may be in part associated with the thermal treatment and not the lithiation step. (C) 2011 Elsevier B.V. All rights reserved.
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