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Structure and Stability of Olivine Phase FePO4

Published online by Cambridge University Press:  30 August 2011

Gene M. Nolis ,
Natalya A. Chernova ,
Shailesh Upreti  and
M. Stanley Whittingham
Gene M. Nolis
Affiliation:
Department of Chemistry and Institute for Materials Research, State University of New York at Binghamton, Binghamton, NY 13902-6000, USA.
Natalya A. Chernova
Affiliation:
Department of Chemistry and Institute for Materials Research, State University of New York at Binghamton, Binghamton, NY 13902-6000, USA.
Shailesh Upreti
Affiliation:
Department of Chemistry and Institute for Materials Research, State University of New York at Binghamton, Binghamton, NY 13902-6000, USA.
M. Stanley Whittingham
Affiliation:
Department of Chemistry and Institute for Materials Research, State University of New York at Binghamton, Binghamton, NY 13902-6000, USA.
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Abstract

LiFePO4 has shown considerable promise as a cathode material in Li-ion batteries due to its stability, low toxicity and high cyclability. However, the data on thermodynamic stability of olivine phase FePO4 (o-FePO4), the delithiated form of o-LiFePO4, remains scarce and contradictory. In this work, o-FePO4 was synthesized by chemical delithiation of o-LiFePO4 and characterized structurally and thermally. X-ray diffraction and absorption data indicate pure olivine phase, but with residual amount of Fe2+, most likely due to incomplete delithiation. Differential scanning calorimetry and thermal gravimetric analysis reveal that o-LixFePO4 decomposes exothermally above 550 °C with about 9% weight loss, the products being trigonal phase FePO4, Fe7(PO4)6, and LiPO3.

Keywords

energy storagex-ray diffraction (XRD)phase transformation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1333: Symposium M – Nanostructured Materials for Energy Storage , 2011 , mrss11-1333-m03-03
Copyright
Copyright © Materials Research Society 2011

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