Electro-polymerized coating for a wet electrolytic capacitor

摘要

A wet electrolytic capacitor that contains a casing within which is positioned an anode formed from an anodically oxidized sintered porous body and a fluidic working electrolyte is provided. The casing contains a conductive coating disposed on a surface of a metal substrate. The casing contains a metal substrate coated with a conductive coating. The conductive coating contains a conductive polymer layer formed through anodic electrochemical polymerization (“electro-polymerization”) of a colloidal suspension on the surface of the metal substrate. The conductive coating also contains a precoat layer that is discontinuous in nature and contains a plurality of discrete projections of a conductive material that are deposited over the surface of the metal substrate in a spaced-apart fashion so that they form “island-like” structures.

主权项

1. A wet electrolytic capacitor comprising:
an anode formed from an anodically oxidized sintered porous body; a fluidic working electrolyte; and a casing within which the anode and working electrolyte are positioned, wherein the casing contains a conductive coating disposed on a surface of a metal substrate, the conductive coating containing:
a discontinuous precoat layer that contains a plurality of discrete projections of a conductive material deposited over the surface of the metal substrate in a spaced-apart fashion so that the projections cover from about 5% to about 80% of the surface of the metal substrate; anda conductive polymer layer that overlies the discontinuous precoat layer, wherein the conductive polymer layer is formed by electrolytic polymerization of a colloidal suspension that includes a precursor monomer.