Electrolytic capacitor

Patent metadata

Field	Value
Publication number	US-12362103-B2
Application number	US-202118258744-A
Country	US
Kind code	B2
Filing date	Dec 28, 2021
Priority date	Dec 28, 2020
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

A disclosed electrolytic capacitor includes a capacitor element. The capacitor element includes an anode body, a dielectric layer formed on a surface of the anode body, a cathode body, and a electrolyte layer and a separator that are disposed between the dielectric layer and the cathode body. The electrolyte layer includes a non-aqueous solvent, conductive particles, and a conductive polymer. An amount of the conductive particles present in a first portion included in the electrolyte layer and located on the dielectric layer side is different from an amount of the conductive particles in a second portion included in the electrolyte layer and located on the cathode body side.

First claim

The invention claimed is:

1. An electrolytic capacitor comprising a capacitor element,
wherein the capacitor element includes an anode body, a dielectric layer formed on a surface of the anode body, a cathode body, and an electrolyte layer and a separator that are disposed between the dielectric layer and the cathode body,
the electrolyte layer includes a non-aqueous solvent, conductive particles, and a conductive polymer,
an amount of the conductive particles present in a first portion included in the electrolyte layer and located on the dielectric layer side is different from an amount of the conductive particles in a second portion included in the electrolyte layer and located on the cathode body side, and
wherein the conductive particles are unevenly distributed in the second portion.

2. The electrolytic capacitor according to claim 1 ,
wherein the electrolyte layer includes a dopant of the conductive polymer.

3. The electrolytic capacitor according to claim 2 ,
wherein the dopant is a polymeric dopant containing an acidic group, and
the electrolyte layer includes an electrolytic solution including the non-aqueous solvent and a base component dissolved in the non-aqueous solvent.

4. The electrolytic capacitor according to claim 3 ,
wherein a content of the base component in the electrolytic solution is 0.1 mass % or more and 20 mass % or less.

5. The electrolytic capacitor according to claim 2 ,
wherein a mass of the conductive particles included in the electrolyte layer is larger than a total mass of the conductive polymer and the dopant included in the electrolyte layer.

6. The electrolytic capacitor according to claim 1 ,
wherein a content C1 (vol %) of the conductive particles in the first portion is in a range of 0 to 0.5 times a content C2 (vol %) of the conductive particles in the second portion.

7. The electrolytic capacitor according to claim 6 ,
wherein the cathode body is a metal foil, and
the conductive particles are metal particles.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kobayashi Takehiro
• Arima Hiroyuki
• Nishimura Yasuhiro

Classifications

• H01G9/151

  with wound foil electrodes · CPC title

• H01G9/025

  Solid electrolytes (H01G11/54 takes precedence) · CPC title

• H01G9/0036

  Formation of the solid electrolyte layer · CPC title

• H01G9/028 Primary

  Organic semiconducting electrolytes, e.g. TCNQ · CPC title

• H01G9/145

  Liquid electrolytic capacitors (H01G11/00 takes precedence) · CPC title