Electrolytic capacitor with codeposited noble metal/base metal cathode element and method for making
First Claim
1. An electrolytic capacitor having a volumetric efficiency greater than about 2500 microfarad-volts per cubic centimeter, said capacitor comprising, in cooperative combination, a metal case having at least one open end and having first lead means attached thereto, a noble metal/base metal electrode element codeposited on the interior of said case from a solution of the metal salts including a molar ratio of noble metal ion to base metal ion between about 0.5 and 1.2, an electrolyte substantially filling the case, a second electrode disposed within said case and separated therefrom by an insulating support, said second electrode having second lead means attached thereto, and means for sealing said open end.
1 Assignment
0 Petitions
Accused Products
Abstract
Codeposited noble metal/base metal cathode elements provide electrolytic capacitors with high volumetric efficiencies. The requisite codeposition is obtained by electrodeposition of the metals onto the interior surface of capacitor cases from solutions of the metal salts.
-
Citations
25 Claims
- 1. An electrolytic capacitor having a volumetric efficiency greater than about 2500 microfarad-volts per cubic centimeter, said capacitor comprising, in cooperative combination, a metal case having at least one open end and having first lead means attached thereto, a noble metal/base metal electrode element codeposited on the interior of said case from a solution of the metal salts including a molar ratio of noble metal ion to base metal ion between about 0.5 and 1.2, an electrolyte substantially filling the case, a second electrode disposed within said case and separated therefrom by an insulating support, said second electrode having second lead means attached thereto, and means for sealing said open end.
- 16. An electrolytic capacitor having a volumetric efficiency greater than about 2500 microfarad-volts per cubic centimeter, said capacitor comprising, in cooperative combination, a metal case having at least one open end and having cathode lead means attached thereto, a platinum family metal/base metal cathode element codeposited on the interior of said case from a solution of the metal salts including a molar ratio of noble metal ion to base metal ion between about 0.5 and 1.2, an electrolyte substantially filling the case, an anode disposed within said case and separated therefrom by an insulating support, said anode having anode lead means attached thereto, and means for sealing said open end.
-
19. A counterelectrode for electrolytic devices having a volumetric efficiency greater than about 2500 microfarad-volts per cubic centimeter, said devices comprising a platinum family metal/base metal counterelectrode element codeposited on a valve metal support from a solution of the metal salts including a molar ratio of noble metal ion to base metal ion between about 0.5 and 1.2.
-
20. A process for preparing a counterelectrode having a platinum family metal/base metal element codeposited on a metal support, comprising:
-
a.) preparing a deposition solution of platinum family metal salt, base metal salt, and electrolyte; b.) contacting said metal support with the deposition solution; c.) electrolyzing the deposition solution for a time and at a current density sufficient to cause codeposition of the platinum family metal and the base metal onto the metal support from a solution of the metal salts including a molar ratio of noble metal ion to base metal ion between about 0.5 and 1.2; and d.) removing the counterelectrode from the residual deposition solution. - View Dependent Claims (21, 22, 23, 24, 25)
-
Specification