Patent Number: 6,166,899

Title: Electrolyte for electrolytic capacitor and electrolytic capacitor having the same

Abstract: And electrolytic capacitor having excellent high temperature life characteristics and excellent low temperature properties, an aluminum electrolytic capacitor having excellent high temperature life characteristics and moisture resistance, a low dielectric loss and good low temperature properties, and an electrolyte therefor. A first electrolyte which includes a mixed solvent of sulfolane and at least one 3-methyl sulfolane and 2,4-dimethyl sulfolane, a second electrolyte in which a quaternized imidazolinium salt or a quaternized pyrimidinium salt is dissolved in a mixed solvent containing sulfolane and .gamma.-butyrolactone, and a third electrolyte which includes a mixed solvent containing .gamma.-butyrolactone and at least two of sulfolane, 3-methyl sulfolane and 2,4-dimethyl sulfolane and a quaternized imidazolinium salt or a quaternized pyrimidinium. An aluminum electrolytic capacitor constructed by winding, via a separator, an anodic electrode foil provided with an anode leading means and a cathodic electrode foil provided with a cathode leading means made of aluminum to thereby form a capacitor device, and then impregnating the capacitor device with each of the above-specified electrolytes.

Inventors: Tamamitsu; Kenji (Tokyo, JP)

Assignee: Nippon Chemi-Con Corporation

International Classification: H01G 9/02 (20060101); H01G 009/02 (); H01M 006/04 ()

Expiration Date: 12/26/2017