Enhanced safety and galvanostatic performance of high voltage lithium batteries by using ionic liquids
We demonstrate that the addition of 1-butyl-1-methylpyrrolidinium hexafluorophosphate ([Py14]PF6)to1.0 M LiPF6in ethylene carbonate-dimethyl carbonate (LP30) widens the temperature range, in which theelectrolyte mixtures are ion conductive and safe. Specifically, at the concentrations of [Py14]PF6above50 wt%, the electrolyte mixtures exhibit aflash point higher than room temperature and fulfill the re-quirements of liquids having controlledflammability.