Ricerc@Sapienza

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.

The presence of fluorous tails in room-temperature ionic liquids imparts new properties to their already rich spectrum of appealing features. The interest towards this class of compounds that are of ionic nature with melting point less than 25 °C is accordingly growing; in particular, compounds bearing relatively long fluorous tails have begun to be considered. In this invited presentation, we show recent results arising from the systematic study of structural properties of a series of fluorinated room temperature ionic liquids, with growing fluorous chain length.