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Characterization of the Carbon-Coating of LiFePO4 by Transmission Electron Microscopy and Raman Spectroscopy

Published online by Cambridge University Press:  26 February 2011

Michel Massot ,
Karim Zaghib ,
Alain Mauger ,
François Gendron  and
Christian M Julien
Michel Massot
Affiliation:
Christian.Julien@insp.jussieu.fr, University Paris 6, INSP, 140 rue de Lourmel, Paris, 75015, France, 33144274561, 33144273882
Karim Zaghib
Affiliation:
karimz@ireq.ca, IREQ, 1800 Bd Lionel-Boulet, Varennes, J3X 1S1, Canada
Alain Mauger
Affiliation:
mauger@ccr.jussieu.fr, CNRS, MPPU, 140 rue de Lourmel, Paris, 75015, France
François Gendron
Affiliation:
gendron@ccr.jussieu.fr, University Paris 6, INSP, 140 rue de Lourmel, Paris, 75015, France
Christian M Julien
Affiliation:
Christian.Julien@insp.Jussieu.fr, University Paris 6, INSP, 140 rue de Lourmel, Paris, 75015, France
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Abstract

We present the properties of the carbon layer deposited at the surface of the LiFePO4 particles. Characterizations include scanning electron microscopy, high-resolution transmission electron microscopy, and Raman scattering spectroscopy. Analuysis of Raman spectra reveals that the carbon deposit is hydrogenated with very small hydrogen/carbon ratio, so that it belongs to the family of the amorphous graphitic carbon. It is expected to have the same properties (small hardness, high electronic conductivity) that favor both the Li diffusion from the LiFePO4 bulk and the charge-discharge rate of the cell.

Keywords

coatingRaman spectroscopypyrolysis
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA13-07
Copyright
Copyright © Materials Research Society 2007

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