Patent ID: 7279117

Claim:
An electrolyte solution for use in an electrolytic capacitor comprising a compound having an unsaturated carbon-carbon or carbon-nitrogen π bond containing chain which undergoes hydrogen addition reaction in the electrolyte solution, at least one type of electrolyte selected from the group consisting of carboxylic acids or their salts or inorganic acids or their salts, 10-80 wt % of an organic solvent and 90-20 wt % water, wherein the compound having an unsaturated carbon-carbon or carbon-nitrogen π bond containing chain which undergoes hydrogen addition reaction comprises alkyne, alkene or imine, and at least one substituent group selected from the group consisting of hydroxyl, formyl, carbonyl, acyl, carboxyl, sulfonyl, sulfinyl, sulfenyl, amido, amino, alkylamino, dialkylamino, alkoxysilyl, silanol, phenylcarboxyl, nitrile, nitro, nitroso, phenol, phosphono, esters and ethers.