Reasons for capacity fading of LiCoPO 4 cathodes in LiPF 6 containing electrolyte solutions

E. Markevich, R. Sharabi, H. Gottlieb, V. Borgel, K. Fridman, G. Salitra, D. Aurbach, G. Semrau, M. A. Schmidt, N. Schall, C. Bruenig

Research output: Contribution to journalArticlepeer-review

137 Scopus citations

Abstract

The reasons for capacity fading of LiCoPO 4 cathodes in 1 M LiPF 6 EC/DMC 1:1 electrolyte solutions were investigated using 19F, 31P NMR and XPS spectroscopy. The origin of the poor performance of LiCoPO 4 cathodes in LiPF 6 containing electrolyte solutions is a nucleophilic attack of F - anions in solution on the P atoms, resulting in the breaking of the P - O bonds of the phosphate anions and the formation of soluble LiPO 2F 2 moieties.

Original languageEnglish
Pages (from-to)22-25
Number of pages4
JournalElectrochemistry Communications
Volume15
Issue number1
DOIs
StatePublished - Feb 2012

Keywords

  • Difluorophosphates
  • F NMR spectroscopy
  • Lithium batteries
  • Lithium-cobalt phosphate
  • Olivines
  • P NMR spectroscopy

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