Stabilization of the Electronic Structure at the Cathode/Electrolyte Interface via MgO Ultra-thin Layer during Lithium-ions Insertion/Extraction
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- YAMAMOTO Kentaro
- Graduate School of Human and Environmental Studies, Kyoto University
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- ORIKASA Yuki
- Graduate School of Human and Environmental Studies, Kyoto University
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- TAKAMATSU Daiko
- Office of Society-Academia Collaboration for Innovation, Kyoto University
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- KOYAMA Yukinori
- Office of Society-Academia Collaboration for Innovation, Kyoto University
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- MORI Shinichiro
- Graduate School of Human and Environmental Studies, Kyoto University
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- MASESE Titus
- Graduate School of Human and Environmental Studies, Kyoto University
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- MORI Takuya
- Graduate School of Human and Environmental Studies, Kyoto University
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- MINATO Taketoshi
- Office of Society-Academia Collaboration for Innovation, Kyoto University
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- TANIDA Hajime
- Office of Society-Academia Collaboration for Innovation, Kyoto University
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- URUGA Tomoya
- Japan Synchrotron Radiation Research Institute
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- OGUMI Zempachi
- Office of Society-Academia Collaboration for Innovation, Kyoto University
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- 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
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- Electrochemistry
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Electrochemistry 82 (10), 891-896, 2014
公益社団法人 電気化学会
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詳細情報
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- CRID
- 1390001206498041600
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- NII論文ID
- 130004697486
- 40020212802
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- NII書誌ID
- AN00151637
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- ISSN
- 21862451
- 13443542
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- HANDLE
- 2433/191119
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- NDL書誌ID
- 025815820
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用可