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Title
Japanese: 
English:Dynamic Behavior at the Interface between Lithium Cobalt Oxide and an Organic Electrolyte Monitored by Neutron Reflectivity Measurements 
Author
Japanese: 湊 丈俊, Hiroyuki Kawaura, 平山 雅章, 田港 聡, 鈴木 耕太, Norifumi L. Yamada, Hidetaka Sugaya, Kentaro Yamamoto, Koji Nakanishi, Yuki Orikasa, Hajime Tanida, 菅野 了次, 荒井 創, 内本 喜晴, Zempachi Ogumi.  
English: Taketoshi Minato, Hiroyuki Kawaura, Masaaki Hirayama, Sou Taminato, Kota Suzuki, Norifumi L. Yamada, Hidetaka Sugaya, Kentaro Yamamoto, Koji Nakanishi, Yuki Orikasa, Hajime Tanida, Ryoji Kanno, Hajime Arai, Yoshiharu Uchimoto, Zempachi Ogumi.  
Language English 
Journal/Book name
Japanese:The Journal of Physical Chemistry C 
English:The Journal of Physical Chemistry C 
Volume, Number, Page Vol. 120    No. 36    pp. 20082-20088
Published date Sept. 15, 2016 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1021/acs.jpcc.6b02523
Abstract Clarification of the interaction between the electrode and the electrolyte is crucial for further improvement of the performance of lithium-ion batteries. We have investigated the structural change at the interface between the surface of a 104- oriented epitaxial thin film of LiCoO2 (LiCoO2(104)), which is one of the stable surfaces of LiCoO2, and an electrolyte prepared using a carbonate solvent (1 M LiClO4 in ethylene carbonate and dimethyl carbonate) by in situ neutron reflectivity measurements. Owing to the decomposition of the organic solvent, a new interface layer was formed after contact of LiCoO2(104) with the electrolyte. The composition and thickness of the interface layer changed during Li+ extraction/insertion. During Li+ extraction, the thickness of the interface layer increased and the addition of an inorganic species is suggested. The thickness of the interface layer decreased during Li+ insertion. We discuss the relationship between battery performance and the dynamic behavior at the interface.

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