# US 2019/0172652 A1 · Solid Electrolytic Capacitor for Use at High Temperatures

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- Number: US 2019/0172652 A1
- Document ID: US20190172652A1
- Status: Published application
- Kind: A1
- Application number: 16/205,719
- Filed: 2018-11-30
- Published: 2019-06-06
- Earliest claimed: 2017-12-05
- Assignees: AVX Corporation
- Applicants: AVX Corporation
- Inventors: Martin Biler; Jan Petrzilek
- Web page: https://patentgrep.com/patent/US20190172652A1

## CPC

- H01G 9/0425: {specially adapted for cathode}
- H01G 9/012: specially adapted for solid capacitors
- H01G 9/032: Inorganic semiconducting electrolytes, e.g. MnO2
- H01G 9/042: characterised by the material (H01G11/22 takes precedence)
- H01G 9/052: Sintered electrodes
- H01G 9/10: Sealing, e.g. of lead-in wires
- H01G 9/15: Solid electrolytic capacitors (H01G11/00 takes precedence)
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)

## Abstract

A capacitor that comprises a capacitor element that includes an anode that contains a dielectric formed on a sintered porous body, a solid electrolyte overlying the anode that contains manganese dioxide, and a cathode coating is provided. The cathode coating includes a barrier layer overlying the solid electrolyte and a metallization layer overlying the barrier layer. The barrier layer contains a valve metal and the metallization layer contains a metal that exhibits an electrical resistivity of about 150 nΩ·m or less (at a temperature of 20° C.) and an electric potential of about −0.5 V or more.

## Claims

### Claim 1

A capacitor comprising a capacitor element that includes:
an anode that contains a dielectric formed on a sintered porous body;
a solid electrolyte overlying the anode that contains manganese dioxide; and
a cathode coating that includes:
a barrier layer overlying the solid electrolyte, wherein the barrier layer contains a valve metal; and
a metallization layer overlying the barrier layer, wherein the metallization layer contains a metal that exhibits an electrical resistivity of about 150 nΩ·m or less (at a temperature of 20° C.) and an electric potential of about −0.5 V or more.

### Claim 2 (depends on 1)

The capacitor of claim 1, wherein the metallization layer includes gold, nickel, silver, tin, copper, platinum, iridium, palladium, or an alloy thereof.

### Claim 3 (depends on 1)

The capacitor of claim 1, wherein the metallization layer has a thickness of from about 0.1 to about 10 micrometers.

### Claim 4 (depends on 1)

The capacitor of claim 1, wherein the metallization layer is formed from a single layer.

### Claim 5 (depends on 4)

The capacitor of claim 4, wherein the single layer includes nickel or an alloy thereof.

### Claim 6 (depends on 1)

The capacitor of claim 1, wherein the metallization layer contains a first sublayer that overlies the barrier layer and a second sublayer that overlies the first sublayer.

### Claim 7 (depends on 6)

The capacitor of claim 6, wherein the second sublayer contains a noble metal.

### Claim 8 (depends on 7)

The capacitor of claim 7, wherein the noble metal is gold or an alloy thereof.

### Claim 9 (depends on 6)

The capacitor of claim 6, wherein the first sublayer contains nickel or an alloy thereof.

### Claim 10 (depends on 1)

The capacitor of claim 1, wherein the valve metal of the barrier layer includes tungsten, titanium, tantalum, vanadium, zinc, aluminum, molybdenum, hafnium, and zirconium, or an alloy thereof.

### Claim 11 (depends on 10)

The capacitor of claim 10, wherein the valve metal of the barrier layer includes an alloy of tungsten.

### Claim 12 (depends on 1)

The capacitor of claim 1, wherein the capacitor element has a carbon content of about 2,000 ppm or less.

### Claim 13 (depends on 1)

The capacitor of claim 1, wherein the cathode coating has a carbon content of about 2,000 ppm or less.

### Claim 14 (depends on 1)

The capacitor of claim 1, further comprising:
an anode termination in electrical contact with the anode; and
a cathode termination in electrical contact with the cathode coating.

### Claim 15 (depends on 14)

The capacitor of claim 14, wherein a conductive adhesive electrically connects the cathode termination to the cathode coating.

### Claim 16 (depends on 15)

The capacitor of claim 15, wherein the conductive adhesive includes sinterable metal particles.

### Claim 17 (depends on 16)

The capacitor of claim 16, wherein the metal particles include silver.

### Claim 18 (depends on 1)

The capacitor of claim 1, wherein the anode body includes tantalum.

### Claim 19 (depends on 1)

The capacitor of claim 1, wherein the capacitor exhibits a capacitance of about 30 nanoFarads per square centimeter or more, an equivalence series resistance of about 500 mohms or less, and/or a dissipation factor of from about 1% to about 25%.

### Claim 20 (depends on 19)

The capacitor of claim 19, wherein the capacitor exhibits a capacitance of about 30 nanoFarads per square centimeter or more, an equivalence series resistance of about 500 mohms or less, and/or a dissipation factor of from about 1% to about 25%, after being exposed to a temperature of 250° C. for about 500 hours.

### Claim 21 (depends on 1)

The capacitor of claim 1, further comprising a housing within which the capacitor element is enclosed.

### Claim 22 (depends on 21)

The capacitor of claim 21, wherein the housing is formed from a resinous material that encapsulates the capacitor element.

### Claim 23 (depends on 21)

The capacitor of claim 21, wherein the housing defines an interior cavity within which the capacitor element is positioned, wherein the interior cavity has a gaseous atmosphere.

### Claim 24 (depends on 23)

The capacitor of claim 23, wherein the gaseous atmosphere contains an inert gas.