Patent ID: 8405956

Claim:
A wet electrolytic capacitor comprising: a porous anode body that is formed from tantalum or niobium oxide, wherein the anode body further contains a dielectric layer formed by anodic oxidation; a cathode comprising a metal substrate coated with a conductive polymer, wherein a surface of the metal substrate is in direct contact with the conductive polymer coating; and an aqueous electrolyte disposed in contact with the cathode and the anode, wherein the electrolyte comprises a salt of a weak organic acid and water, wherein the electrolyte has a pH of from about 4.5 to about 7.0, determined at a temperature of 25° C., wherein the organic acid has a first acid dissociation constant of from 2 to 10, determined at a temperature of 25° C., and further wherein the weak organic acid is a polyprotic acid.