Patent ID: 6902684

Claim:
A non-aqueous electrolyte for electric storage devices which comprises a nitrile solvent and a conductive salt comprising a cation selected from the group consisting of (a) an imidazolium compound of the formula: wherein R 1 , R 2 , R 3 , R 4 , and R 5 are the same or different and are selected from the group consisting of hydrogen, an alkyl of 1-4 carbon atoms, and fluoroalkyl, with the proviso that at least one of R 1 , R 2 , R 3 , R 4 and R 5 is hydrogen, (b) an ammonium compound of the formula: wherein R 5 , R 6 , R 7 , and R 8 , are the same or different and consists of alkyl of 1-4 carbon atoms, or fluoroalkyl, and (c) a tetraalkylammonium compound of the formula: R 6 R 7 R 8 R 9 N+ wherein R 6 , R 7 , R 8 , and R 9 are the same or different and consists of alkyl of 1-4 carbon atoms and an anion which is fluoro hydrogen fluoride (F(HF)x wherein x is 1-4), said salt being present in a molar concentration of 0.4 to 3.0.