The use of accelerating rate calorimetry (ARC) for the study of the thermal reactions of Li-ion battery electrolyte solutions

J. S. Gnanaraj, E. Zinigrad, L. Asraf, H. E. Gottlieb, M. Sprecher, D. Aurbach*, M. Schmidt

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

122 Scopus citations

Abstract

The thermal stability of 1M LiPF6, LiClO4, LiN(SO2CF2CF3)2 (LiBETI) and LiPF3(CF2CF3)3 (LiFAP) solutions in mixtures of ethylene carbonate, diethyl carbonate and dimethyl carbonate in the temperature range 40-350°C was studied by ARC and DSC. NMR was used to analyze the reaction products at different reaction stages. The least thermally stable are LiClO4 solutions. LiPF3(CF2CF3)3 solutions showed higher thermal stability than LiPF6 solutions. The highest thermal stability was found for LiN(SO2CF2CF3)2 solutions. Studies by DSC and pressure measurements during ARC experiments with LiPF6 and LiFAP solutions detected an endothermic reaction, which occurs before a number of exothermic reactions as the temperature increases. Fluoride ions are formed and react with the alkyl carbonate molecules both as bases and as nucleophiles.

Original languageAmerican English
Pages (from-to)794-798
Number of pages5
JournalJournal of Power Sources
Volume119-121
DOIs
StatePublished - 1 Jun 2003
Externally publishedYes
EventSelected Papers Presented at the 11th IMLB - Monterey, CA, United States
Duration: 22 Jun 200228 Jun 2002

Keywords

  • Accelerating rate calorimetry (ARC)
  • Alkyl carbonate solutions
  • Differential scanning calorimetry (DSC)
  • Thermal stability

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