Li-ion diffusion in Li4Ti5 O12 and LiTi2 O4 battery materials detected by muon spin spectroscopy

Jun Sugiyama, Hiroshi Nozaki, Izumi Umegaki, Kazuhiko Mukai, Kazutoshi Miwa, Susumu Shiraki, Taro Hitosugi, Andreas Suter, Thomas Prokscha, Zaher Salman, James S. Lord, Martin Månsson

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    22 Citations (Scopus)

    Abstract

    Lithium diffusion in spinel Li4Ti5O12 and LiTi2O4 compounds for future battery applications has been studied with muon spin relaxation (μ+SR). Measurements were performed on both thin-film and powder samples in the temperature range between 25 and 500 K. For Li4Ti5O12 and above about ∼200K, the field distribution width (Δ) is found to decrease gradually, while the field fluctuation rate (ν) increases exponentially with temperature. For LiTi2O4, on the contrary, the Δ(T) curve shows a steplike decrease at ∼350K, around which the ν(T) curve exhibits a local maximum. These behaviors suggest that Li+ starts to diffuse above around 200 K for both spinels. Assuming a jump diffusion of Li+ at the tetrahedral 8a site to the vacant octahedral 16c site, diffusion coefficients of Li+ at 300 K in the film samples are estimated as (3.2±0.8)×10-11 cm2/s for Li4Ti5O12 and (3.6±1.1)×10-11 cm2/s for LiTi2O4. Further, some small differences are found in both thermal activation energies and Li-ion diffusion coefficients between the powder and thin-film samples.

    Original languageEnglish
    Article number014417
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume92
    Issue number1
    DOIs
    Publication statusPublished - 2015 Jul 20

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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  • Cite this

    Sugiyama, J., Nozaki, H., Umegaki, I., Mukai, K., Miwa, K., Shiraki, S., Hitosugi, T., Suter, A., Prokscha, T., Salman, Z., Lord, J. S., & Månsson, M. (2015). Li-ion diffusion in Li4Ti5 O12 and LiTi2 O4 battery materials detected by muon spin spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 92(1), [014417]. https://doi.org/10.1103/PhysRevB.92.014417