2014年10月
Stabilization of the Electronic Structure at the Cathode/Electrolyte Interface via MgO Ultra-thin Layer during Lithium-ions Insertion/Extraction
ELECTROCHEMISTRY
- 巻
- 82
- 号
- 10
- 開始ページ
- 891
- 終了ページ
- 896
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.5796/electrochemistry.82.891
- 出版者・発行元
- ELECTROCHEMICAL SOC JAPAN
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. (C) The Electrochemical Society of Japan, All rights reserved.
- リンク情報
- ID情報
-
- DOI : 10.5796/electrochemistry.82.891
- ISSN : 1344-3542
- eISSN : 2186-2451
- Web of Science ID : WOS:000342862400016