Electrolytic solution for electrolytic capacitor and electrolytic capacitor using the same

Abstract

An electrolytic solution for an electrolytic capacitor, which includes (1) a solvent made up of 20 to 80% by weight of an organic solvent and 80 to 20% by weight of water, (2) at least one electrolyte selected from the group consisting of carboxylic acids, salts of carboxylic acids, inorganic acids, and salts of inorganic acids, and (3) a chelate compound. Preferably, an organic acid or salt thereof and an inorganic acid or salt thereof are used in combination. The chelate compound may be selected from the group consisting of ethylenediamine-N,N,N′,N′-tetraacetic acid, trans-1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid monohydrate, N,N-bis(2-hydroxyethyl)glycine, ethylenediamine-N,N,N′,N′-tetrakis(methylenephosphonic acid), diethylenetriamine-N,N,N′,N″,N″-pentaacetic acid, 1,3-diamino-2-hydroxypropane-N,N,N′,N′-tetraacetic acid, ethylenediamine-N,N′-diacetic acid, ethylenediamine-N,N′-bis(methylenephosphonic acid) hemihydrate, O,O′-bis(2-aminoethyl)ethyleneglycol-N,N,N′,N′-tetraacetic acid, and N-(2-hydroxyethyl)ethylenediamine-N,N′,N′-triacetic acid. An electrolytic capacitor using, as its electrolytic solution, the disclosed electrolytic solution is also disclosed.

Dependencies are inferred from the claim text.