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Title
Japanese: 
English:Raman Imaging Analysis of Local Crystal Structures in LiCoO2 Thin Films Calcined at Different Temperatures 
Author
Japanese: 原康介, 矢野隆章, 鈴木耕太, 平山雅章, 林智広, 菅野了次, 原正彦.  
English: Kosuke Hara, Takaaki Yano, Kouta Suzuki, Masaaki Hirayama, Tomohiro HAYASHI, Ryoji KANNO, Masahiko Hara.  
Language English 
Journal/Book name
Japanese: 
English:Anal. Sci. 
Volume, Number, Page Vol. 33    No. 7    pp. 853-858
Published date July 10, 2017 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://www.ncbi.nlm.nih.gov/pubmed/28690265
 
DOI https://doi.org/10.2116/analsci.33.853
Abstract Hara, Kosuke Yano, Taka-Aki Suzuki, Kota Hirayama, Masaaki Hayashi, Tomohiro Kanno, Ryoji Hara, Masahiko eng Japan Anal Sci. 2017;33(7):853-858. doi: 10.2116/analsci.33.853. Local crystalline structures of LiCoO2 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 LiCoO2 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 (LiCoO2) and non-stoichiometric (Li1-xCoO2, 0 < x < 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.

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