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A 57Fe Mössbauer spectroscopy study of iron nanoparticles obtained in situ in conversion ferrite electrodes

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Abstract

Transmission Mössbauer spectroscopy and CEMS are powerful tools to study the changes in which iron-containing active materials of conversion electrodes are involved during lithium cell charge and discharge. The usual spectrum of pristine CoFe2O4 spinel with two sextets ascribable to Fe3 +  ions in both tetrahedral and octahedral environments, changes dramatically after cell discharge to 0 V vs. Li, and can be interpreted as the result of iron reduction to the metallic state in the form of superparamagnetic metal nanoparticles dispersed in a Li2O matrix. After cell charge to 3 V, the MS of the pristine sample is not recovered. Instead, two new doublets are visible with IS ascribable to Fe3 +  ions. 57Fe CEMS evidences the different environment of iron atoms in the surface of the nanodispersed material found in the used electrodes.

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Authors and Affiliations

  1. Institut Charles Gerhardt (UMR 5253), Equipe Agrégats, Interfaces et Matériaux pour l’Energie, Université Montpellier II, CC 15, Place E. Bataillon, 34095, Montpellier Cedex 5, France

    Jean-Claude Jumas & Manfred Womes

  2. Laboratorio de Química Inorgánica, Universidad de Córdoba. Edif. C3, Campus de Rabanales, 14071, Córdoba, Spain

    Ricardo Alcántara, Pedro Lavela & José L. Tirado

Authors
  1. Jean-Claude Jumas
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  2. Manfred Womes
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  3. Ricardo Alcántara
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  4. Pedro Lavela
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  5. José L. Tirado
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Correspondence to José L. Tirado.

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Jumas, JC., Womes, M., Alcántara, R. et al. A 57Fe Mössbauer spectroscopy study of iron nanoparticles obtained in situ in conversion ferrite electrodes. Hyperfine Interact 183, 1–5 (2008). https://doi.org/10.1007/s10751-008-9728-3

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  • DOI: https://doi.org/10.1007/s10751-008-9728-3

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