Electrolyte solute, electrolyte and high-voltage supercapacitor

The invention discloses an electrolyte solute used for a high-voltage supercapacitor. The anion A is one or more than one of tetrafluoroboric acid, hexafluorophosphate, bis (trifluoromethane) sulfonamide, bis (trifluoromethane) methyl and perfluoroalkyl group sulfonate. The cation of the solute is one or more than one of trimethyl ethyl ammonium, trimethyl propyl ammonium, trimethyl butyl ammonium and trimethyl amyl ammonium. The invention further discloses an electrolyte and a supercapacitor using the electrolyte. The electrolyte solute, the electrolyte and the high-voltage supercapacitor have the advantages that the high-voltage supercapacitor manufactured through the electrolyte prepared with the solute can work stably for a long time under 2.7V - 3.2V voltage, energy density is improved greatly, the high-power-density property is kept, and the service life of the capacitor is prolonged greatly.