Investigation of methoxypropionitrile as co-solvent for ethylene carbonate based electrolyte in supercapacitors. A safe and wide temperature range electrolyte

► Electrolytes EC/MP exhibit relevant properties for supercapacitor application. ► Secure electrolytes can be obtain with high conductivities in a large temperature window. ► Spiro-(1,1′)-bipyrrolidinium tetrafluoroborate (SBPBF4) as salt permit to improve cycle life, and performances at low temperature.