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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Jumas, JC., Womes, M., Alcántara, R., Lavela, P., Tirado, J.L. (2008). A 57Fe Mössbauer spectroscopy study of iron nanoparticles obtained in situ in conversion ferrite electrodes. In: Gajbhiye, N.S., Date, S.K. (eds) ICAME 2007. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-78697-9_17
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DOI: https://doi.org/10.1007/978-3-540-78697-9_17
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