Stabilization of the Electronic Structure at the Cathode/Electrolyte Interface via MgO Ultra-thin Layer during Lithium-ions Insertion/Extraction

  • YAMAMOTO Kentaro
    Graduate School of Human and Environmental Studies, Kyoto University
  • ORIKASA Yuki
    Graduate School of Human and Environmental Studies, Kyoto University
  • TAKAMATSU Daiko
    Office of Society-Academia Collaboration for Innovation, Kyoto University
  • KOYAMA Yukinori
    Office of Society-Academia Collaboration for Innovation, Kyoto University
  • MORI Shinichiro
    Graduate School of Human and Environmental Studies, Kyoto University
  • MASESE Titus
    Graduate School of Human and Environmental Studies, Kyoto University
  • MORI Takuya
    Graduate School of Human and Environmental Studies, Kyoto University
  • MINATO Taketoshi
    Office of Society-Academia Collaboration for Innovation, Kyoto University
  • TANIDA Hajime
    Office of Society-Academia Collaboration for Innovation, Kyoto University
  • URUGA Tomoya
    Japan Synchrotron Radiation Research Institute
  • OGUMI Zempachi
    Office of Society-Academia Collaboration for Innovation, Kyoto University
  • UCHIMOTO Yoshiharu
    Graduate School of Human and Environmental Studies, Kyoto University

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抄録

Degradation mechanism of surface coating effects at the cathode/electrolyte interface is investigated using thin-film model electrodes combined with operando X-ray absorption spectroscopy (XAS). MgO-coated LiCoO2 thin-film electrodes prepared via pulsed laser deposition at room temperature and high temperature are used as model systems. The MgO coating improves the durability of the cathode during high-potential cycling. Operando total reflection fluorescence XAS reveals that initial deterioration due to reduction of Co ions at the surface of the uncoated-LiCoO2 thin film upon electrolyte immersion is inhibited by the MgO coating. Operando depth-resolved XAS reveals that the MgO coating suppresses drastic distortions of local structure at the LiCoO2 surface as observed in the uncoated-LiCoO2 during charging process. The electronic and local structure changes at the electrode/electrolyte interface for two types of surface coating morphologies are discussed.

収録刊行物

  • Electrochemistry

    Electrochemistry 82 (10), 891-896, 2014

    公益社団法人 電気化学会

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