The effects of salts in methyl difluoroacetate (MFA)-based electrolytes on their ionic conductivity and their thermal stability were investigated. When LiPF6 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 LiPF6 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 LiCoO2 coexisting with an electrolyte of 1 mol dm-3 LiPF6/MFA is also reported.
All Science Journal Classification (ASJC) codes