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Effects of Salts in Methyl Difluoroacetate‐based Electrolytes on their Thermal Stability in Lithium‐ion Batteries
Author(s) -
Tanaka T.,
Doi T.,
Okada S.,
Yamaki J.i.
Publication year - 2009
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.200800085
Subject(s) - electrolyte , ethylene carbonate , dimethyl carbonate , thermal stability , lithium (medication) , chemistry , inorganic chemistry , exothermic reaction , ionic conductivity , thermal decomposition , salt (chemistry) , decomposition , organic chemistry , methanol , electrode , medicine , endocrinology
The effects of salts in methyl difluoroacetate (MFA)‐based electrolytes on their ionic conductivity and their thermal stability were investigated. When LiPF 6 was used as a salt, an MFA‐based electrolyte showed a higher ionic conductivity than an ethylene carbonate (EC) and dimethyl carbonate (DMC)‐based electrolyte from –30 to 25 °C. In DSC curves, while an MFA‐based electrolyte containing LiPF 6 gave only negligible exothermic heat up to 400 °C, a large exothermic peak due to the electrolyte decomposition was observed at about 270 °C for an EC + DMC‐based electrolyte. The thermal stability of lithium metal and de‐lithiated LiCoO 2 coexisting with an electrolyte of 1 mol dm –3 LiPF 6 /MFA is also reported.