# US 12,112,899 B2 · Electrolytic capacitor

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- Number: US 12,112,899 B2
- Document ID: US12112899B2
- Status: Granted
- Kind: B2
- Application number: 18/208,788
- Filed: 2023-06-12
- Published: 2023-10-12
- Granted: 2024-10-08
- Earliest claimed: 2017-09-29
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Kazuyo Saito; Yuichiro Tsubaki; Tatsuji Aoyama
- Web page: https://patentgrep.com/patent/US12112899B2

## CPC

- H01G 9/035: Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence)
- H01G 9/028: Organic semiconducting electrolytes, e.g. TCNQ
- H01G 9/145: Liquid electrolytic capacitors (H01G11/00 takes precedence)
- H01G 9/151: {with wound foil electrodes}
- H01G 9/022: Electrolytes; Absorbents
- H01G 9/042: characterised by the material (H01G11/22 takes precedence)
- Y02E 60/13: Energy storage using capacitors
- 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)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An electrolytic capacitor includes a capacitor element and electrolytic solution. The capacitor element includes an anode body with an oxide film, and a solid electrolyte contacting the oxide film. The electrolytic solution contains a solvent and a solute. The solvent contains at least one selected from the group consisting of a lactone compound, a glycol compound, and a sulfone compound. The solute includes a first acid component and a base component. The first acid component includes at least one of a benzenedicarboxylic acid and a derivative of the benzenedicarboxylic acid. The base component includes at least one of an amine and an amidine. A concentration of the solute in the electrolytic solution ranges from 15% by mass to 40% by mass, inclusive. A ratio (V/Vw) of a formation voltage V of the oxide film to a rated voltage Vw of the electrolytic capacitor is less than or equal to 1.7.

## Claims

### Claim 1

An electrolytic capacitor comprising:
a capacitor element; and
an electrolytic solution, wherein:
the capacitor element includes an anode body with an oxide film and a solid electrolyte in contact with the oxide film,
the electrolytic solution contains a solvent and a solute,
the solvent contains at least one selected from the group consisting of a lactone compound, a glycol compound, and a sulfone compound,
the solute includes an acid component and a base component, the acid component including at least one of a polycarboxylic acid or a monocarboxylic acid, the base component including at least one of an amine or an amidine,
a concentration of the solute in the electrolytic solution ranges from 15% by mass to 40% by mass, inclusive, and
a ratio V/Vw of a formation voltage V of the oxide film to a rated voltage Vw of the electrolytic capacitor is more than 1.5 and less than or equal to 1.7.

### Claim 2 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the polycarboxylic acid includes an aliphatic polycarboxylic acid.

### Claim 3 (depends on 2)

The electrolytic capacitor according to claim 2, wherein the aliphatic polycarboxylic acid includes at least one selected from the group consisting of oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, 1,6-decanedicarboxylic acid, 5,6-decanedicarboxylic acid, maleic acid, fumaric acid, and itaconic acid.

### Claim 4 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the monocarboxylic acid includes an aromatic monocarboxylic acid.

### Claim 5 (depends on 1)

The electrolytic capacitor according to claim 1, wherein a pH of the electrolytic solution is less than or equal to 4.5.

### Claim 6 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
a conductivity of the electrolytic solution ranges from 0.01 mS/cm to 3 mS/cm, inclusive.

### Claim 7 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the rated voltage Vw is less than or equal to 100 volts.

### Claim 8 (depends on 1)

The electrolytic capacitor according to claim 1, wherein a concentration of the base component in the electrolytic solution is more than or equal to 3.5% by mass.

### Claim 9 (depends on 1)

The electrolytic capacitor according to claim 1, wherein a concentration of the acid component in the electrolytic solution is more than or equal to 3% by mass.

### Claim 10 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the lactone compound is y-butyrolactone.

### Claim 11 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the glycol compound is ethylene glycol.

### Claim 12 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the sulfone compound is sulfolane.

### Claim 13 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the ratio V/Vw of the formation voltage V of the oxide film to the rated voltage Vw of the electrolytic capacitor is more than or equal to 1.6 and less than or equal to 1.7.