| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrolytic capacitor having low impedance characteristics, suppressed in the characteristic change of an electrostatic capacity or the like even after the lapse of 10,000 hours in a load test at a high temperature of 105°C, and having a long lifetime. SOLUTION: A capacitor element is configured by winding an anode including an oxide film on a surface and composed of a valve metal and a cathode composed of the valve metal via a separator. The capacitor element is impregnated with an electrolyte, and housed in a sealed case, thus configuring the electrolytic capacitor. The electrolyte is obtained by dissolving a salt of an azelaic acid and secondary amine having a hydrophobic substitutional group to a solvent containing water and ethylene glycol, and the content of the salt is kept within a range of 14 to 22 mass% of the whole electrolyte. Since a large quantity of an azelaic acid salt having a large electrode deterioration-restraining effect is contained in the electrolyte and the secondary amine is further adsorbed on the surface of the anode and forms a hydrophobic layer, the hydration deterioration of an electrode is hardly caused, and the capacitor having excellent high-temperature lifetime characteristics is obtained. COPYRIGHT: (C)2011,JPO&INPIT |
