| 摘要 |
PROBLEM TO BE SOLVED: To provide electrolyte solution for driving aluminum electrolytic capacitor, whose specific resistance is low and reliability at a high temperature, is improved. SOLUTION: At least one type from among adipic acid, benzoic acid and their salts is dissolved as a solute in a solvent, which is a mixture of ethylene glycol and water, then a phosphite as shown in the formula is added. It is desirable that the added quantity of the phosphite be 0.01 to 3.0 wt.% and the mixing quantity of water added to electrolyte solution be 10 to 50 wt.%. As the phosphite, methyl phosphite, ethyl phosphite, isopropyl phosphite, butyl phosphite, dimethyl phosphite, diethyl phosphite, diisopropyl phosphite, dibutyl phosphite, trimethyl phospphite, triethyl phosphite, triisopropyl phosphite and tributyl phosphite may be used.
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