A detailed investigation of the thermal reactions of LiPF6 solution in organic carbonates using ARC and DSC

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

141 Scopus citations

Abstract

The thermal stability of 1 M LiPF6 solutions in mixtures of ethylene carbonate, diethyl carbonate, and dimethyl carbonate in the temperature range of 40 to 350°C was studied by accelerating rate calorimeters (ARC) and differential scanning calorimeters (DSC). Nuclear magnetic resonance (NMR) was used to analyze the condensed reaction products at different reaction stages. Studies by DSC and pressure measurements during ARC experiments with LiPF6 solutions detected a gas-releasing endothermic reaction starting at ∼170°C, involving diethyl carbonate which occurs before a number of exothermic reactions, which follow as the temperature increases. Fluoride ions are released and react with the alkyl carbonate molecules both as bases and as nucleophiles. The bulk analysis by NMR shows that HO-CH2-CH2-OH, FCH2CH2-OH, F-CH2CH2-F, and polymer are major products. Gas analysis by NMR and Fourier transform infrared spectroscopy shows PF5, CO2, CH2F, CH3CH2F, and H2O as major gaseous products of the thermal reaction of these solutions.

Original languageAmerican English
Pages (from-to)A1533-A1537
JournalJournal of the Electrochemical Society
Volume150
Issue number11
DOIs
StatePublished - Nov 2003
Externally publishedYes

Fingerprint

Dive into the research topics of 'A detailed investigation of the thermal reactions of LiPF6 solution in organic carbonates using ARC and DSC'. Together they form a unique fingerprint.

Cite this