Capacitor including a cathode having a nitride coating

• US 5,754,394 A
• Filed: 11/04/1996
• Issued: 05/19/1998
• Est. Priority Date: 03/22/1993
• Status: Expired due to Term

• Current Assignee: Evans Capacitor Co.
• Original Assignee: Evans Capacitor Co.
• Inventors: Evans, David A., Miller, John R.
• Primary Examiner(s): Ledynh, Bot L.
• Application Number:
  US08/743,037
• Time in Patent Office: 561 Days
• Field of Search: 361/502-503, 361/508-509, 361/516, 361/523, 361/528-529, 361/532, 429/209-210, 429/218
• US Class Current: 361/516
• CPC Class Codes: H01G 9/00 Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
• CPC Class Codes: H01G 9/042 characterised by the material H01G11/22 takes precedence
• CPC Class Codes: H01G 9/0425 specially adapted for cathode
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A capacitor includes a cathode having a coating including an oxide of one of cobalt, molybdenum, and tungsten, a nitride of a metal selected from the group consisting of titanium, vanadium, zirconium, niobium, molybdenum, and tungsten, a carbide of a metal selected from the group consisting of vanadium, niobium, molybdenum, and tungsten, an intercalation carbon cathode, or an electrically conducting polymer selected from polyacetylene, polypyrrole, poly-p-phenylene, polythiophene, poly-3-phenylthiophene, and poly-3-(4-fluorophenyl)-thiophene, an anode including a metal selected from tantalum, aluminum, niobium, zirconium, and titanium, spaced from the coating, and an electrolyte in contact with the coating and the anode.

Claims

1. A capacitor comprising:

a cathode comprising a coating including a nitride of a metal selected from the group consisting of titanium, vanadium, zirconium, niobium, molybdenum, and tungsten;

an anode spaced from the coating and including a metal selected from the group consisting of tantalum, aluminum, niobium, zirconium, and titanium; and

an electrolyte disposed between and in contact with the coating and the anode.

2. The capacitor of claim 1 including a metal container containing the anode and electrolyte and on which the coating is disposed.

3. The capacitor of claim 1 wherein the cathode comprises two opposed electrically conducting plates, each plate including the coating, the coatings facing each other, the anode is disposed between and spaced from each of the coatings, and the electrolyte is in contact with each of the coatings.

4. A capacitor cell comprising:

a first metal body;

a cathode comprising a coating including a nitride of a metal selected from the group consisting of titanium, vanadium, zirconium, niobium, molybdenum, and tungsten;

a second metal body spaced from the coating;

an anode including a metal selected from the group consisting of tantalum, aluminum, niobium, zirconium, and titanium disposed on the second metal body opposite the first metal body; and

an electrolyte disposed between and in contact with the coating and the anode.