Nonaqueous electrolytic solution for electric double layer capacitors
AssigneeOtsuka Chemical Co., Ltd.
InventorsYoshihisa TOKUMARU, Yoshihiro OKADA, Taiji NAKAGAWA, Shoji HIKETA, Koichi SORAJO
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Abstract
The present invention provides a nonaqueous electrolytic solution that provides an electric double layer capacitor having excellent durability. The nonaqueous electrolytic solution of the present invention is a nonaqueous electrolytic solution for electric double layer capacitors prepared by dissolving a quaternary ammonium salt as an electrolyte in a nonaqueous solvent, and the nonaqueous electrolytic solution has an alkali metal cation concentration of 0.1 to 30 ppm.
Claims10
A nonaqueous electrolytic solution for electric double layer capacitors prepared by dissolving a quaternary ammonium salt represented by the general formula (I):
- Q+X− (I)
- (wherein Q+ represents a quaternary ammonium cation, X− represents a counter ion selected from the group consisting of PF6−, BF4−, AsF6−, N(CF3SO3)2−, SbF6−, and RfSO3− (Rf is a fluoroalkyl group having 1 to 8 carbon atoms)) as an electrolyte in a nonaqueous solvent, the quaternary ammonium salt excluding spiro quaternary ammonium tetrafluoroborate, the nonaqueous electrolytic solution having an alkali metal cation concentration of 0.1 to 30 ppm.
Dependencies are inferred from the claim text.