# US 10,121,600 B2 · Solid electrolytic capacitor with improved performance at high voltages

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- Number: US 10,121,600 B2
- Document ID: US10121600B2
- Status: Granted
- Kind: B2
- Application number: 15/406,826
- Filed: 2017-01-16
- Published: 2017-05-25
- Granted: 2018-11-06
- Earliest claimed: 2012-07-19
- Assignees: AVX Corporation
- Applicants: AVX Corporation
- Inventors: Jan Petrzilek; Martin Biler
- Web page: https://patentgrep.com/patent/US10121600B2

## CPC

- H01G 9/15: Solid electrolytic capacitors (H01G11/00 takes precedence)
- H01G 9/0032: {formation of the dielectric layer}
- H01G 9/0036: {Formation of the solid electrolyte layer}
- H01G 9/025: Solid electrolytes (H01G11/54 takes precedence)
- H01G 9/028: Organic semiconducting electrolytes, e.g. TCNQ
- H01G 9/0525: {Powder therefor}
- H01G 9/07: Dielectric layers
- 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 solid electrolytic capacitor that comprises a sintered porous anode, a dielectric layer that overlies the anode body, and a solid electrolyte overlying the dielectric layer is provided. The anode is formed from a finely divided powder (e.g., nodular or angular) having a relatively high specific charge. Despite the use of such high specific charge powders, high voltages can be achieved through a combination of features relating to the formation of the anode and solid electrolyte. For example, relatively high press densities and sintering temperatures may be employed to achieve “sinter necks” between adjacent agglomerated particles that are relatively large in size, which render the dielectric layer in the vicinity of the neck less susceptible to failure at high forming voltages.

## Claims

### Claim 1

A method for forming a solid electrolytic capacitor, the method comprising:
pressing a finely divided powder into the form of a pellet, wherein the powder has a specific charge of greater than about 30,000 μF*V/g and contains particles having a three-dimensional shape;
sintering the pellet;
anodically oxidizing the sintered pellet to form a dielectric layer that overlies the anode; and
applying a dispersion of pre-polymerized conductive polymer particles to the dielectric layer; and
further comprising applying a layer over the dispersion, wherein the layer includes a hydroxy-functional nonionic polymer.

### Claim 2 (depends on 1)

The method of claim 1, wherein the pellet is sintered at a temperature of from about 1350° C. to about 1600° C.

### Claim 3 (depends on 1)

The method of claim 1, wherein the finely divided powder is pressed to a press density of from about 5.0 grams per cubic centimeter to about 6.5 grams per cubic centimeter.

### Claim 4 (depends on 1)

The method of claim 1, wherein the pre-polymerized particles are formed from a substituted polythiophene.

### Claim 5 (depends on 1)

The method of claim 1, wherein the dispersion further contains a monomeric or polymeric counteranion.

### Claim 6 (depends on 1)

The method of claim 1, wherein the hydroxy-functional nonionic polymer is a polyalkylene ether.

### Claim 7 (depends on 1)

The method of claim 1, wherein the hydroxy-functional nonionic polymer is applied in the form of a second dispersion that contains a plurality of the pre-polymerized conductive polymer particles.