Differentiating allotropic LiCoO2/Li2Co2O4: A structural and electrochemical study
- Authors
- Kan, Yongchun; Hu, Yuan; Ren, Yang; Bareno, Javier; Bloom, Ira; Sun, Yang Kook; Amine, Khalil; Chen, Zonghai
- Issue Date
- Dec-2014
- Publisher
- ELSEVIER
- Keywords
- Allotropic structure; Lithium cobalt oxide; Structure property relationship; Cation mixing; Lithium battery
- Citation
- JOURNAL OF POWER SOURCES, v.271, pp.97 - 103
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 271
- Start Page
- 97
- End Page
- 103
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/25711
- DOI
- 10.1016/j.jpowsour.2014.07.178
- ISSN
- 0378-7753
- 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.
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