| abstract |
(57) [Problem] To provide an aluminum electrolytic capacitor having good liquid leakage characteristics, and further having good dielectric loss and low-temperature characteristics. SOLUTION: An insulating film is formed on part or all of the surface of a cathode extraction means, and a quaternized imidazolinium salt or a quaternary pyrimidinium is mixed in a mixed solvent containing sulfolane, γ-butyrolactone, and ethylene glycol. Dissolve the salt and add boric acid to the electrolyte in the amount of 0.5 to 2.5 wt. % And mannitol in an amount of 0.5 to 2.5 wt% are used, so that the liquid leakage characteristics are good, the withstand voltage characteristics of 50 V or more, and the low temperature characteristics are also good. |