Patent ID: 8675347

Claim:
An electrolytic solution for an aluminum electrolytic capacitor comprising: a solvent containing water; electrolytes selected from the group consisting of a carboxylic acid and a carboxylic salt; a phosphorus oxoacid ion-generating compound which can generate a phosphorus oxoacid ion in an aqueous solution; and a chelating agent which can coordinate with aluminum to form an aqueous aluminum chelate complex, wherein the electrolytic solution comprises, as the electrolytes, at least one compound selected from the group consisting of azelaic acid and an azelaic acid salt and at least one compound selected from the group consisting of formic acid, a formic acid salt, adipic acid, an adipic acid salt, glutaric acid and a glutaric acid salt, and the content of the at least one compound selected from the group consisting of azelaic acid and an azelaic acid salt is at least 0.03 moles per kg of the solvent and at most a saturated amount at 50° C. in the electrolytic solution.