Raman Imaging Analysis of Local Crystal Structures in LiCoO₂ Thin Films Calcined at Different Temperatures Raman Imaging Analysis of Local Crystal Structures in LiCoO<sub>2</sub> Thin Films Calcined at Different Temperatures

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Author(s)

    • HARA Kosuke HARA Kosuke
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • YANO Taka-aki YANO Taka-aki
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology|RIKEN
    • SUZUKI Kota SUZUKI Kota
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • KANNO Ryoji KANNO Ryoji
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • HARA Masahiko HARA Masahiko
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology|RIKEN|Earth-Life Science Institute, Tokyo Institute of Technology

Abstract

Local crystalline structures of LiCoO<sub>2</sub> nanothin film cathodes in a lithium ion battery have been spectroscopically elucidated through confocal Raman imaging analysis at high spatial resolution of several hundred nanometers. A significant difference in the crystalline structure is found between the nanometric thin films and bulk powders. Thermally induced local decomposition of LiCoO<sub>2</sub> into an impurity phase on the films has also been revealed along with the mechanism of the temperature-triggered decomposition process. Moreover, frequency-based Raman imaging enables us to locally probe spatial separation between stoichiometric (LiCoO<sub>2</sub>) and non-stoichiometric (Li<sub>1-x</sub>CoO<sub>2</sub>, 0 < <i>x</i> < 1) crystal phases on the thin films. Such local crystalline analysis is a promising approach to provide new insights into the degradation mechanism of lithium-ion batteries, which would result in improving the performance of thin film-based lithium ion batteries.

Journal

  • Analytical Sciences

    Analytical Sciences 33(7), 853-858, 2017

    The Japan Society for Analytical Chemistry

Codes

  • NII Article ID (NAID)
    130005796374
  • NII NACSIS-CAT ID (NCID)
    AA10500785
  • Text Lang
    ENG
  • ISSN
    0910-6340
  • NDL Article ID
    028340123
  • NDL Call No.
    Z54-F482
  • Data Source
    NDL  J-STAGE 
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