Method of improving electromechanical integrity of cathode coating to cathode termination interfaces in solid electrolytic capacitors
First Claim
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1. A solid electrolytic capacitor comprising:
- an anode;
a dielectric on said anode;
a cathode on said dielectric;
a plated metal layer on said cathode wherein said plated metal layer comprises an exterior surface of a first high melting point metal; and
an adjacent layer selected from a circuit trace and a lead wherein said adjacent layer comprises a second plated metal layer comprising a second high melting point metal wherein said first high melting point metal and said second high melting point metal are directly metallurgically bonded as an alloy with a low melting point metal.
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Abstract
A solid electrolytic capacitor is described which comprises an anode, a dielectric on the anode and a cathode on the dielectric. A conductive coating is on the cathode wherein the conductive layer comprises an exterior surface of a first high melting point metal. An adjacent layer is provided comprising a second high melting point metal, wherein the first high melting point metal and the second high melting point metal are metallurgically bonded with a low melting point metal.
43 Citations
46 Claims
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1. A solid electrolytic capacitor comprising:
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an anode; a dielectric on said anode; a cathode on said dielectric; a plated metal layer on said cathode wherein said plated metal layer comprises an exterior surface of a first high melting point metal; and an adjacent layer selected from a circuit trace and a lead wherein said adjacent layer comprises a second plated metal layer comprising a second high melting point metal wherein said first high melting point metal and said second high melting point metal are directly metallurgically bonded as an alloy with a low melting point metal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for forming a capacitor comprising the steps of:
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providing an anode; forming a dielectric on said anode; applying a cathode on said dielectric; plating a first high melting point metal on said cathode; plating a second high melting point metal on a circuit trace, a cathode lead, a mounting tab or an adjacent cathode; and forming a direct metallurgical bond between said first high melting point metal and said second high melting point metal as an alloy with a low melting point metal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A capacitor stack comprising:
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at least two solid electrolytic capacitors with each solid electrolytic capacitor of said electrolytic capacitors comprising; an anode; a dielectric on said anode; a cathode on said dielectric; and a conductive coating plated on said cathode wherein said conductive coating comprises an exterior surface of a first high melting point metal; and an adjacent layer selected from a circuit trace and a lead wherein said adjacent layer comprises a second high melting point metal plated on said adjacent layer wherein said first high melting point metal and said second high melting point metal are metallurgically bonded as bridges of alloy with a low melting point metal there between. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification