| abstract |
(57) Abstract: Provided is a driving electrolytic solution capable of suppressing a decrease in capacitance due to hydration deterioration of a cathode electrode foil of an aluminum electrolytic capacitor. SOLUTION: A mixed solvent containing ethylene glycol as a main solvent and water as a sub-solvent is mixed with at least one of boric acid, an organic acid, or a salt thereof, 1st, 4th, 1st and 5th, 1st and 6th, 1st and 7th One or more naphthalene-based compounds having hydroxyl groups at the 2-, 6-, and 2-positions are mixed at 0.1 to 5.0 wt%. |