Differentiating allotropic LiCoO2/Li2Co 2O4 : A structural and electrochemical study

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yongchun Kan
  • Yuan Hu
  • Javier Bareño
  • Ira Bloom
  • Yang-Kook Sun
  • Khalil Amine
  • Zonghai Chen

Detail(s)

Original languageEnglish
Pages (from-to)97-103
Journal / PublicationJournal of Power Sources
Volume271
Publication statusPublished - 19 Aug 2014
Externally publishedYes

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 °C and 650 °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, ∼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 Li 2Co2O4 domain was also identified by ex situ high-resolution X-ray diffraction. © 2014 Published by Elsevier B.V.

Research Area(s)

  • Allotropic structure, Cation mixing, Lithium battery, Lithium cobalt oxide, Structure property relationship

Bibliographic Note

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Citation Format(s)

Differentiating allotropic LiCoO2/Li2Co 2O4 : A structural and electrochemical study. / Kan, Yongchun; Hu, Yuan; Ren, Yang; Bareño, Javier; Bloom, Ira; Sun, Yang-Kook; Amine, Khalil; Chen, Zonghai.

In: Journal of Power Sources, Vol. 271, 19.08.2014, p. 97-103.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review