Role of AlF3 coating on LiCoO2 particles during cycling to cutoff voltage above 4.5 v

Yang Kook Sun, Chong Seung Yoon, Seoung Taek Myung, Ilias Belharouak, Khalil Amine

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Cell tests demonstrated that the use of an AlF3 coating enabled a LiCoO2 electrode to deliver a higher discharge capacity (208 mAh g-1) at an upper cutoff voltage of 4.54 V. About 94% of the initial capacity was retained after 50 cycles, while the capacity retention of pristine LiCoO2 was only 60% at 4.5 V. The improved electrochemical performance with the AlF3 coating was attributed to the delay of structural degradation of LiCoO2 during cycling. A structural analysis of the cycled LiCoO2 electrode revealed that the pristine LiCoO2 transforms to a cubic spinel phase via an intermediate phase triggered by progressive chemical leaching of Co during cycling. The AlF 3 coating protected LiCoO2 from the chemical attack by HF and thus helped to delay the eventual phase transformation to a spinel phase. By delaying this transformation, the AlF3 coating was able to reduce the charge-transfer resistance and maintain the structural stability when cycled above 4.5 V.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume156
Issue number12
DOIs
Publication statusPublished - 10 Nov 2009
Externally publishedYes

Fingerprint

cut-off
coatings
Coatings
cycles
Electric potential
electric potential
spinel
chemical attack
Chemical attack
Electrodes
electrodes
structural stability
leaching
structural analysis
Structural analysis
Leaching
phase transformations
Charge transfer
Phase transitions
charge transfer

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Role of AlF3 coating on LiCoO2 particles during cycling to cutoff voltage above 4.5 v. / Sun, Yang Kook; Yoon, Chong Seung; Myung, Seoung Taek; Belharouak, Ilias; Amine, Khalil.

In: Journal of the Electrochemical Society, Vol. 156, No. 12, 10.11.2009.

Research output: Contribution to journalArticle

Sun, Yang Kook ; Yoon, Chong Seung ; Myung, Seoung Taek ; Belharouak, Ilias ; Amine, Khalil. / Role of AlF3 coating on LiCoO2 particles during cycling to cutoff voltage above 4.5 v. In: Journal of the Electrochemical Society. 2009 ; Vol. 156, No. 12.
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