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Unfolding the role of iron in Li-ion conversion electrode materials by 57Fe Mössbauer spectroscopy

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Abstract

57Fe Mössbauer spectroscopy is particularly useful in the study of oxide and oxalate conversion anode materials for Li-ion batteries. After reduction in lithium test cells, all these materials showed Mössbauer spectra ascribable to iron atoms in two different environments with superparamagnetic relaxation. The spectra recorded at 12 K revealed the ferromagnetic character in agreement with particle sizes of ca. 5 nm. The two types of iron can be ascribed then to surface and core atoms. Core iron atoms play an important role to retain high faradic capacity values for a large number of cycles. These atoms are preserved from irreversible reactions with the electrolyte and hence they promote a high reversibility and rate capability.

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Authors and Affiliations

  1. Laboratorio de Química Inorgánica, Universidad de Córdoba, Edificio Marie Curie, Campus de Rabanales, 14071, Córdoba, Spain

    José L. Tirado, Pedro Lavela, Carlos Pérez Vicente, Bernardo León & Candela Vidal-Abarca

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  1. José L. Tirado
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  2. Pedro Lavela
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  3. Carlos Pérez Vicente
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  4. Bernardo León
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  5. Candela Vidal-Abarca
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Correspondence to José L. Tirado.

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Tirado, J.L., Lavela, P., Pérez Vicente, C. et al. Unfolding the role of iron in Li-ion conversion electrode materials by 57Fe Mössbauer spectroscopy. Hyperfine Interact 207, 53–59 (2012). https://doi.org/10.1007/s10751-011-0421-6

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