High resolution x-ray absorption and emission spectroscopy of LixCoO2 single crystals as a function delithiation

L. Simonelli, E. Paris, C. Iwai, K. Miyoshi, J. Takeuchi, T. Mizokawa, N. L. Saini*

*この研究の対応する著者

研究成果: Article査読

3 被引用数 (Scopus)

抄録

The effect of delithiation in LixCoO2 is studied by high resolution Co K-edge x-ray absorption and x-ray emission spectroscopy. Polarization dependence of the x-ray absorption spectra on single crystal samples is exploited to reveal information on the anisotropic electronic structure. We find that the electronic structure of LixCoO2 is significantly affected by delithiation in which the Co ions oxidation state tending to change from 3+ to 4+. The Co intersite (intrasite) 4p-3d hybridization suffers a decrease (increase) by delithiation. The unoccupied 3d t 2g orbitals with a 1g symmetry, containing substantial O 2p character, hybridize isotropically with Co 4p orbitals and likely to have itinerant character unlike anisotropically hybridized 3d e g orbitals. Such a peculiar electronic structure could have significant effect on the mobility of Li in LixCoO2 cathode and hence the battery characteristics.

本文言語English
論文番号105702
ジャーナルJournal of Physics Condensed Matter
29
10
DOI
出版ステータスPublished - 2017 1 31

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学

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