Wet electrolytic capacitor containing a gelled working electrolyte
AssigneeAVX Corporation
InventorsDirk H. Dreissig, James Steven Bates, Andrew Paul Ritter, Zebbie Lynn Sebald, Mitchell D. Weaver, Robert Hazen Pease
Life of this patent
Estimating the term…
Abstract
A wet electrolytic capacitor is provided. The capacitor contains an anode comprising an anodically oxidized pellet formed from a pressed and sintered powder, a cathode that contains a metal substrate coated with a conductive polymer, and a working electrolyte in communication with the anode and the cathode. The working electrolyte is in the form of a gel and comprises an ammonium salt of an organic acid, inorganic oxide particles, an acid, and a solvent system that comprises water. The working electrolyte has a pH value of from about 5.0 to about 8.0.
Claims34
A wet electrolytic capacitor comprising:
- an anode comprising an anodically oxidized pellet formed from a pressed and sintered powder, wherein the powder is formed from tantalum particles;
- a cathode that comprises a metal substrate coated with a conductive polymer;
- and
- a working electrolyte in communication with the anode and the cathode, wherein the working electrolyte is in the form of a gel and comprises an ammonium salt of an organic acid, inorganic oxide particles, an acid, and an aqueous solvent system that comprises water, wherein the working electrolyte has a pH value of from about 5.0 to about 8.0.
A method for forming a wet electrolytic capacitor, the method comprising:
- forming a mixture that comprises an ammonium salt of an organic acid, inorganic oxide particles, an acid, and an aqueous solvent system that comprises water;
- inducing gelation of the mixture so that it exhibits a first phase angle δ of from about 50° to 90°;
- placing the gelled mixture into communication with an anode, cathode, or both, wherein the anode comprises an anodically oxidized pellet formed from a pressed and sintered powder wherein the powder is formed from tantalum particles, and the cathode comprises a metal substrate coated with a conductive polymer;
- and
- thereafter, allowing the mixture to further gel to form a working electrolyte that exhibits a second phase angle δ of from 0° to about 20°, wherein the working electrolyte further has a pH value of from about 5.0 to about 8.0.
Dependencies are inferred from the claim text.