METHOD OF MANUFACTURING ELECTROLYTIC CAPACITOR

• US 20130059064A1
• Filed: 03/07/2012
• Published: 03/07/2013
• Est. Priority Date: 03/25/2011
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Ishimoto, Hitoshi, Aoyama, Tatsuji, Majima, Ryo
• Granted Patent: US 9,373,448 B2
• Time in Patent Office: Days
• US Class Current: 427/80
• CPC Class Codes: H01G 11/48 Conductive polymers
• CPC Class Codes: H01G 11/52 Separators
• CPC Class Codes: H01G 11/56 Solid electrolytes, e.g. gels; Additives therein
• CPC Class Codes: H01G 9/0029 Processes of manufacture
• CPC Class Codes: H01G 9/0036 Formation of the solid electrolyte layer
• CPC Class Codes: H01G 9/028 Organic semiconducting electrolytes, e.g. TCNQ
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A method of manufacturing an electrolytic capacitor includes preparing a dielectric film formed on a surface of an anode foil, forming a first conductive polymer layer on a surface of the dielectric film by immersing the anode foil in first dispersion solution including conductive polymer particles and forming a second conductive polymer layer covering the first conductive polymer layer solvent by immersing the anode foil in second dispersion solution including second conductive polymer particles and second solvent. The surface of the anode foil has plural pits formed therein. The second dispersion solution has a pH value farther from 7 than the first dispersion solution does. This configuration can suppress damages to the dielectric film.

Claims

1. A method of manufacturing an electrolytic capacitor, said method comprising:

preparing an anode foil having a surface and a dielectric film formed on the surface of the anode foil, the surface of the anode foil having a plurality of pits formed therein;

forming a first conductive polymer layer on the surface of the dielectric film by immersing the anode foil in first dispersion solution including first conductive polymer particles and first solvent; and

forming a second conductive polymer layer covering the first conductive polymer layer by immersing the anode foil in second dispersion solution, the second dispersion solution including second conductive polymer particles and second solvent, the second dispersion solution having a pH value farther from 7 than the first dispersion solution.

2. The method according to claim 1, wherein a mode of diameters of the first conductive polymer particles is smaller than a mode of diameters of the second conductive polymer particles.

3. The method according to claim 2, wherein a mode of diameters of the second conductive polymer particles is smaller than a mode of diameters of the plurality of the pits.

4. The method according to claim 1, wherein a weight concentration of the first conductive polymer in the first dispersion solution is lower than a weight concentration of the second conductive polymer particles in the second dispersion solution.

5. The method according to claim 1, wherein the first dispersion solution has a lower viscosity than the second dispersion solution.