TY - JOUR
T1 - A detailed investigation of the thermal reactions of LiPF6 solution in organic carbonates using ARC and DSC
AU - Gnanaraj, J. S.
AU - Zinigrad, E.
AU - Asraf, L.
AU - Gottlieb, H. E.
AU - Sprecher, M.
AU - Schmidt, M.
AU - Geissler, W.
AU - Aurbach, D.
PY - 2003/11
Y1 - 2003/11
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0242582187&partnerID=8YFLogxK
U2 - 10.1149/1.1617301
DO - 10.1149/1.1617301
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AN - SCOPUS:0242582187
SN - 0013-4651
VL - 150
SP - A1533-A1537
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 11
ER -