Electrolytic capacitor

Patent metadata

Field	Value
Publication number	US-12542245-B2
Application number	US-202118258759-A
Country	US
Kind code	B2
Filing date	Dec 28, 2021
Priority date	Dec 28, 2020
Publication date	Feb 3, 2026
Grant date	Feb 3, 2026

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 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 and conductive particles. A ratio D/T of an average maximum diameter D of the conductive particles to an average thickness T of the separator is in a range of 0.01 to 0.9.

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 and conductive particles, a ratio D/T of an average maximum diameter D of the conductive particles to an average thickness T of the separator is in a range of 0.01 to 0.9, and the conductive particles are also disposed throughout the separator.

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

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

4 . The electrolytic capacitor according to claim 3 ,
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.

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

6 . The electrolytic capacitor according to claim 3 ,
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.

7 . The electrolytic capacitor according to claim 1 ,
wherein the conductive particles are particles of a conductive carbon material.

8 . The electrolytic capacitor according to claim 1 ,
wherein the cathode body is a conductive foil, and the conductive particles are metal particles.

9 . The electrolytic capacitor according to claim 1 ,
wherein the ratio D/T is in a range of 0.01 to 0.33.

10 . A method for manufacturing an electrolytic capacitor comprising:
a step (i) of forming a capacitor element precursor including a foil-shaped anode body having a dielectric layer on a surface thereof, a foil-shaped cathode body, and a separator disposed between the anode body and the cathode body, a step (ii) of impregnating the capacitor element precursor with a dispersion including conductive particles and a conductive polymer doped with a dopant to form a polymer layer including the conductive particles and the conductive polymer such that the polymer layer is adjacent to the dielectric layer, a step (iii) of impregnating the polymer layer with a liquid component containing a non-aqueous solvent to form an electrolyte layer including the non-aqueous solvent and the conductive particles, wherein a ratio D/T of an average maximum diameter D of the conductive particles to an average thickness T of the separator is in a range of 0.01 to 0.9, and the content of the liquid component in the electrolyte layer is in the range of 10 to 99.85 mass %.

11 . The method according to claim 10 ,
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.

12 . The method according to claim 10 ,
wherein the conductive particles are graphene particles.

13 . The method according to claim 10 ,
wherein the dopant is a polymeric dopant.

14 . The method according to claim 10 ,
wherein the liquid component is an electrolytic solution containing the non-aqueous solvent and a base component dissolved in the non-aqueous solvent.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kobayashi Takehiro
• Arima Hiroyuki
• Nishimura Yasuhiro

Classifications

• H01G9/15

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

• H01G9/145

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

• H01G9/035

  Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence) · CPC title

• H01G9/025 Primary

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

• H01G9/151

  with wound foil electrodes · CPC title