Cathode properties of amorphous and crystalline FePO4

FePO4 is an attractive rare-metal-free cathode active material. Simple and inexpensive new synthesis routes obtained from solution were investigated. P2O5 and Fe metal powders, both of which react in water at room temperature, were selected as inexpensive starting materials. Amorphous powders obtain...

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Bibliographic Details
Published in:Journal of power sources 2005-08, Vol.146 (1-2), p.570-574
Main Authors: OKADA, Shigeto, YAMAMOTO, Takafumi, OKAZAKI, Yasunori, YAMAKI, Jun-Ichi, TOKUNAGA, Masahiro, NISHIDA, Tetsuaki
Format: Article
Language:English
Subjects:
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
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Summary:FePO4 is an attractive rare-metal-free cathode active material. Simple and inexpensive new synthesis routes obtained from solution were investigated. P2O5 and Fe metal powders, both of which react in water at room temperature, were selected as inexpensive starting materials. Amorphous powders obtained through ball milling were annealed at various temperatures (100-650 deg C) in air. IR spectra showed that PO4 tetrahedra units existed even in the amorphous matrix. XRD peaks of the trigonal FePO4 phase appeared above 500 deg C. Reversible Fe3+/Fe2+ redox reactions in the amorphous and crystalline FePO4 were confirmed by 57Fe Mossbauer spectroscopy. The heating temperature dependence of the cathode properties is reported.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2005.03.200