| abstract |
The present invention provides a novel low-melting-point onium salt that can be used as an electrolyte having physical properties suitable for various uses, has a low melting point, high ionic conductivity, and excellent oxidation resistance. SOLUTION: The following formula (I) such as trifluoromethylsulfuric acid (trifluoromethanesulfonic acid) imide / trimethylpropylammonium salt, trifluoromethylsulfuric acid (trifluoroacetic acid) imide / tetraethylammonium salt, etc. {R 1 -O-S (= O) 2 -} {R 2 -} N - · Z + (I) In the formula, R 1 is an unsubstituted or halogen-substituted hydrocarbon group, and R 2 is R 3 —OS (＝ O) 2 —, R 4 —S (＝ O) 2 — or R 5 — (C ＝ O) — (R 3 , R 4 and R 5 each represent an unsubstituted or halogen-substituted alkyl group, provided that R 3 is the same as R 1 . Or a cyano group, and Z + is an organic onium cation. ｝ An onium salt represented by the formula: [Selection diagram] None |