# US 11,443,901 B2 · Electrolytic capacitor comprising an electrolytic solution containing a first base component, a first acid component, and a second acid component

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- Number: US 11,443,901 B2
- Document ID: US11443901B2
- Status: Granted
- Kind: B2
- Application number: 17/080,932
- Filed: 2020-10-27
- Published: 2021-02-11
- Granted: 2022-09-13
- Earliest claimed: 2018-05-21
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Yuichiro Tsubaki; Kazuyo Saito; Tatsuji Aoyama
- Web page: https://patentgrep.com/patent/US11443901B2

## CPC

- H01G 9/028: Organic semiconducting electrolytes, e.g. TCNQ
- H01G 9/035: Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence)
- H01G 9/15: Solid electrolytic capacitors (H01G11/00 takes precedence)
- H01G 9/145: Liquid 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

An electrolytic capacitor includes an anode body having a dielectric layer disposed on a surface of the anode body, a solid electrolyte layer that is in contact with the dielectric layer, and an electrolytic solution. The solid electrolyte layer includes a conductive polymer. The electrolytic solution contains a first base component, a first acid component, and a second acid component. The first base component includes an amidine compound. The first acid component includes a composite compound of an inorganic acid and an organic acid. The second acid component includes at least one selected from a group consisting of boric acid, phosphoric acid, phosphorous acid, hypophosphorous acid, and phosphonic acid.

## Claims

### Claim 1

An electrolytic capacitor comprising:
an anode body having a dielectric layer disposed on a surface of the anode body;
a solid electrolyte layer that is in contact with the dielectric layer, the solid electrolyte layer including a conductive polymer; and
an electrolytic solution, wherein:
the electrolytic solution contains a first base component, a first acid component, and a second acid component,
the first base component includes an amidine compound,
the first acid component includes a composite compound of an inorganic acid and an organic acid,
the second acid component includes at least one selected from a group consisting of boric acid, phosphoric acid, phosphorous acid, hypophosphorous acid, and phosphonic acid, and
a content proportion of the second acid component in the electrolytic solution ranges from 3 wt % to 15 wt %, inclusive.

### Claim 2 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the first acid component includes at least one selected from a group consisting of borodisalicylic acid, borodiglycolic acid, and borodioxalic acid.

### Claim 3 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the electrolytic solution further contains a second base component, and
the second base component includes at least one selected from a group consisting of a primary amine compound, a secondary amine compound, a tertiary amine compound, and a quaternary ammonium compound.

### Claim 4 (depends on 3)

The electrolytic capacitor according to claim 3, wherein:
the second base component is the primary amine compound, and
the primary amine compound is an aliphatic primary amine compound having a hydroxyl group.

### Claim 5 (depends on 4)

The electrolytic capacitor according to claim 4, wherein the aliphatic primary amine compound having a hydroxyl group has three or more hydroxyl groups.

### Claim 6 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the electrolytic solution contains a solvent, and
the solvent includes a glycol compound.

### Claim 7 (depends on 6)

The electrolytic capacitor according to claim 6, wherein a weight average molecular weight of the glycol compound is less than or equal to 300.

### Claim 8 (depends on 1)

The electrolytic capacitor according to claim 1, wherein a content proportion of a total amount of the first base component and the first acid component in the electrolytic solution ranges from 5 wt % to 30 wt %, inclusive.

### Claim 9 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the second acid component is boric acid.

### Claim 10 (depends on 1)

The electrolytic capacitor according to claim 1, wherein a pH of the electrolytic solution ranges from 1.5 to 5.5, inclusive.

### Claim 11 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the electrolytic solution further contains a third acid component, and
the third acid component includes a nitro compound.