C80 Calorimeter Studies of the Thermal Behavior of LiPF6 Solutions

The thermal behavior of several LiPF6 solutions was studied using a C80 calorimeter. It was found that oxygen might react with the solvents and decrease their thermal stability. The dissolution of LiPF6 influences the thermal behavior remarkably with more heat generation and a lower onset temperature. Furthermore, the exothermic peak of LiPF6 based on an electrolyte containing diethyl carbonate (DEC) was found around 185 ∘C, which is 9.5–13.6 ∘C lower than that containing dimethyl carbonate (DMC), which may be due to the relative activity of C2H5— and CH3— in DEC and DMC, respectively.