Patent ID: 8921589

Claim:
An electrolyte formulation comprising at least one compound of formula (I) Kt + [BF(CN) 3 ] − (I) in which Kt + is an organic cation selection from the group of where the substituents R 1′ to R 10′ each, independently of one another, denote H with the assumption that R 1′ and R 4′ are not simultaneously H and are not perfluorinated at the same time, straight-chain or branched alkyl having 1-20 C atoms, which optionally may be fluorinated or perfluorinated, straight-chain or branched alkenyl having 2-20 C atoms and one or more double bonds, which optionally may be fluorinated or perfluorinated, straight-chain or branched alkynyl having 2-20 C atoms and one or more triple bonds which optionally may be fluorinated or perfluorinated or straight-chain or branched alkoxyalkyl having 2 to 8 C atoms and wherein the anion fluorotricyanoborate is in molar concentrations from 0.1 to 5.5 M.