Patent ID: 7667953
Filing Date: 2010-02-23
Classification: H01G,Y02E

Abstract:
1. An electrolytic capacitor comprising a capacitor element, a case containing the capacitor element, and a sealant with which the case is sealed, the capacitor element comprising a pair of electrode foils each comprising a dielectric, a separator for isolating the electrode foils from each other, and an electrolytic solution filled between the electrode foils, wherein the electrolytic solution comprising a solvent and a solute, wherein water accounts for from more than 80% to 100% by weight of the solvent, the solute is selected from a carboxylic acid or a salt thereof and an inorganic acid or a salt thereof, and further comprises one or more compounds selected from a nitro compound, a nitroso compound or a salt thereof, a chelete forming compound or a salt thereof, saccharides, a phosphoric acid compound or a derivative thereof, a watersoluble polymer and a silane coupling agent alone or in combination, and ‘the total solute content is from 1.5 to 44% by weight, and in which the content of the carboxylic acid-based electrolytes is within a range from 0.5 to 35% by weight, and wherein the electrolytic solution has a specific resistance at 30° C. of 65 Ωcm or less, and wherein the separator of the capacitor has a space in which ions are capable of migrating between the electrode foils even under low temperature conditions, and has a density of 0.3 to 0.5 g/cm 3 .