# US 12,119,185 B2 · Electrolytic capacitor and method for producing same

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- Number: US 12,119,185 B2
- Document ID: US12119185B2
- Status: Granted
- Kind: B2
- Application number: 17/813,605
- Filed: 2022-07-20
- Published: 2022-11-24
- Granted: 2024-10-15
- Earliest claimed: 2020-01-30
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Yoshiaki Ishimaru; Yoshikazu Hirata
- Web page: https://patentgrep.com/patent/US12119185B2

## CPC

- H01G 9/0036: {Formation of the solid electrolyte layer}
- H01G 9/028: Organic semiconducting electrolytes, e.g. TCNQ
- H01G 9/035: Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence)
- H01G 9/151: {with wound foil electrodes}
- 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 a capacitor element. The capacitor element includes an electrode group including an anode body, a cathode body, a separator, and an electrolyte layer. The anode body and the cathode body each has a foil shape. The anode body has a dielectric layer on a surface of the anode body. The electrolyte layer is in contact with the anode body, the cathode body, and the separator. The electrolyte layer contains a conductive polymer and a hydroxyl group-containing compound having a melting point of 50° C. or higher. The hydroxyl group-containing compound is at least one compound selected from the group consisting of a sugar and a polyhydric alcohol. The hydroxyl group-containing compound is unevenly distributed more in a peripheral portion of the capacitor element than in a central portion of the capacitor element.

## Claims

### Claim 1

An electrolytic capacitor comprising a capacitor element, wherein:
the capacitor element includes:
an electrode group that includes an anode body, a cathode body, and a separator, the anode body and the cathode body each having a foil shape, the anode body having a dielectric layer on a surface of the anode body, and
an electrolyte layer that is in contact with the anode body, the cathode body, and the separator,
the electrode group is a wound body in which the anode body and the cathode body facing each other are wound with the separator interposed between the anode body and the cathode body, or a laminate in which the anode body and the cathode body facing each other are laminated with the separator interposed between the anode body and the cathode body,
the electrolyte layer contains a conductive polymer and a hydroxyl group-containing compound having a melting point of 50° C. or higher, the hydroxyl group-containing compound being at least one compound selected from the group consisting of a sugar and a polyhydric alcohol,
the hydroxyl group-containing compound is unevenly distributed more in a peripheral portion of the capacitor element than in a central portion of the capacitor element, and
the conductive polymer is unevenly distributed more in the peripheral portion of the capacitor element than in the central portion of the capacitor element.

### Claim 2 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the electrode group is the wound body, and
in the electrolyte layer, the hydroxyl group-containing compound is unevenly distributed more at both ends in a winding axis direction of the wound body and at an outermost circumference portion of the wound body than at a central portion of the wound body.

### Claim 3 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the electrode group is the laminate, and
in the electrolyte layer, the hydroxyl group-containing compound is unevenly distributed more at a portion in contact with a peripheral portion of the anode body than at a central portion of the laminate.

### Claim 4 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the electrolyte layer contains a non-aqueous solvent or a non-aqueous electrolytic solution.

### Claim 5 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the hydroxyl group-containing compound is at least one selected from the group consisting of glucose, mannitol, sorbitol, xylitol, pentaerythritol, and trimethylolpropane.

### Claim 6 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the conductive polymer is poly(3,4-ethylenedioxythiophene) doped with polystyrenesulfonic acid.

### Claim 7 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the hydroxyl group-containing compound is at least one selected from the group consisting of glucose, mannitol, xylitol, pentaerythritol, and trimethylolpropane.

### Claim 8

An electrolytic capacitor comprising a capacitor element, wherein:
the capacitor element includes an anode body, a cathode layer, and an electrolyte layer, the anode body being porous and having a dielectric layer on a surface of the anode body, the electrolyte layer being disposed between the anode body and the cathode layer,
the capacitor element contains a conductive polymer and a hydroxyl group-containing compound having a melting point of 50° C. or higher, the hydroxyl group-containing compound being at least one compound selected from the group consisting of a sugar and a polyhydric alcohol,
the hydroxyl group-containing compound is unevenly distributed more in a peripheral portion of the anode body than in a central portion of the anode body, and
the conductive polymer is unevenly distributed more in the peripheral portion of the anode body than in the central portion of the anode body.

### Claim 9 (depends on 8)

The electrolytic capacitor according to claim 8, wherein the hydroxyl group-containing compound is at least one selected from the group consisting of glucose, mannitol, sorbitol, xylitol, pentaerythritol, and trimethylolpropane.

### Claim 10 (depends on 8)

The electrolytic capacitor according to claim 8, wherein the conductive polymer is poly(3,4-ethylenedioxythiophene) doped with polystyrenesulfonic acid.

### Claim 11 (depends on 8)

The electrolytic capacitor according to claim 8, wherein the hydroxyl group-containing compound is at least one selected from the group consisting of glucose, mannitol, xylitol, pentaerythritol, and trimethylolpropane.