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

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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.

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Authors and Affiliations

  1. IMPMC, University Paris 6, 4 place Jussieu, 75252, Paris, France

    Michel Massot

  2. IREQ, 1800 Bd Lionel-Boulet, J3X 1S1, Varennes, Canada

    Karim Zaghib

  3. MPPU, CNRS, 140 rue de Lourmel, 75015, Paris, France

    Alain Mauger

  4. INSP, University Paris 6, 140 rue de Lourmel, 75015, Paris, France

    François Gendron & M. Julien Christian

Authors
  1. Michel Massot
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  2. Karim Zaghib
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  3. Alain Mauger
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  4. François Gendron
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  5. M. Julien Christian
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Massot, M., Zaghib, K., Mauger, A. et al. Characterization of the Carbon-Coating of LiFePO4 by Transmission Electron Microscopy and Raman Spectroscopy. MRS Online Proceedings Library 972, 1307 (2006). https://doi.org/10.1557/PROC-0972-AA13-07

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  • DOI: https://doi.org/10.1557/PROC-0972-AA13-07

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