Local structure of LiCoO 2 nanoparticles studied by Co K-edge x-ray absorption spectroscopy

L. Maugeri, A. Iadecola, B. Joseph, L. Simonelli, L. Olivi, M. Okubo, I. Honma, H. Wadati, T. Mizokawa, N. L. Saini

    研究成果: Article査読

    12 被引用数 (Scopus)

    抄録

    We have studied the local structure of LiCoO 2 nanoparticles by Co K-edge x-ray absorption spectroscopy as a function of particle size. Extended x-ray absorption fine structure data reveal substantial changes in the near neighbor distances and the associated mean square relative displacements with decreasing particle size. X-ray absorption near edge structure spectra show clear local geometrical changes with decreasing particle size, similar to those that appear in the charging (delithiation) process. The results suggest that the LiCoO 2 nanoparticles are characterized by a large atomic disorder confined to the Co-O octahedra, similar to the distortions generated during the delithiation, and this disorder should be the primary limiting factor for a reversible diffusion of Li ions when nanoparticles of LiCoO 2 are used as cathode material in rechargeable Li ion batteries.

    本文言語English
    論文番号335305
    ジャーナルJournal of Physics Condensed Matter
    24
    33
    DOI
    出版ステータスPublished - 2012 8月 22

    ASJC Scopus subject areas

    • 材料科学(全般)
    • 凝縮系物理学

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