Differentiating allotropic LiCoO2/Li2Co2O4: A structural and electrochemical study

Title
Differentiating allotropic LiCoO2/Li2Co2O4: A structural and electrochemical study
Other Titles
Li2Co2O4: A structural and electrochemical study
Author
선양국
Keywords
Allotropic structure; Lithium cobalt oxide; Structure property relationship; Cation mixing; Lithium battery
Issue Date
2014-12
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, 권: 271, 페이지: 97-103
Abstract
In situ high-energy X-ray diffraction was carried out to investigate the structural transformation of lithium cobalt oxides during the solid-state synthesis. Two allotropic phases were observed during the synthesis process; Li2Co2O4 with a spinel structure was formed within the temperature window between 450 degrees C and 650 degrees C, beyond which Li2Co2O4 was converted to its hexagonal counterpart, layered LiCoO2, through a cation exchange between Li and Co. In electrochemical tests, the Li2Co2O4 was estimated to have a very low reversible capacity, similar to 20 mAh g(-1), and a high initial irreversible capacity loss of about 80 mAh g(-1). An interfacial phase between layered LiCoO2 domain and spinel Li2Co2O4 domain was also identified by ex situ high-resolution X-ray diffraction. (C) 2014 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0378775314012348?via%3Dihubhttp://hdl.handle.net/20.500.11754/49142
ISSN
0378-7753; 1873-2755
DOI
10.1016/j.jpowsour.2014.07.178
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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