ELECTRIC-DOUBLE-LAYER CAPACITOR AND ELECTROLYTE THEREFOR

PROBLEM TO BE SOLVED: To provide an electrolyte wherein the coefficient of its viscosity is low, and it exhibits an excellent low-temperature characteristic, and further, it exhibits a high conductivity over a wide temperature range, and moreover, it is excellent in a long-term reliability, and provide an electric-double-layer capacitor using the electrolyte. SOLUTION: In the electrolyte for electric-double-layer capacitors and an electric-double-layer capacitor created by using the electrolyte, there is dissolved as the electrolyte in the mixed solvent of DMC, EC, and PC, a tetrafluoroboric acid fourth spiroammonium represented by a general formula (1). In the formula, each of n and m is the positive integer of 3-7, and each of X and Y represents hydrogen atom or either one substituent selected from the group comprising a halogen group and alkyl groups of the carbon numbers of 1-4. The n pieces of X and the m pieces of Y which are existent in a ring may be respectively identical with each other or different from each other. COPYRIGHT: (C)2007,JPO&INPIT