US 12,266,481 B2
Electrolytic capacitor including electrolytic solution having high electrical conductivity and method for producing same
Tatsuji Aoyama, Kyoto (JP); Yuji Otsuka, Yamaguchi (JP); Tomoyuki Tashiro, Yamaguchi (JP); Kenta Chashiro, Osaka (JP); and Yuichiro Tsubaki, Kyoto (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Jul. 21, 2022, as Appl. No. 17/813,940.
Application 17/813,940 is a continuation of application No. PCT/JP2021/005824, filed on Feb. 17, 2021.
Claims priority of application No. 2020-025781 (JP), filed on Feb. 19, 2020.
Prior Publication US 2022/0359127 A1, Nov. 10, 2022
Int. Cl. H01G 9/00 (2006.01); H01G 9/025 (2006.01); H01G 9/035 (2006.01)
CPC H01G 9/0036 (2013.01) [H01G 9/025 (2013.01); H01G 9/035 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for producing an electrolytic capacitor, the method comprising:
preparing an anode foil, a cathode foil, and a fibrous structure, the anode foil having a porous portion including a dielectric layer;
preparing a conductive polymer-containing liquid, the conductive polymer-containing liquid containing a conductive polymer component and a first solvent;
forming a separator by removing at least a part of the first solvent after applying the conductive polymer-containing liquid to the fibrous structure;
forming a capacitor element from the anode foil, the separator, and the cathode foil; and
impregnating the capacitor element with an electrolytic solution, wherein:
the electrolytic solution contains a solute and a second solvent,
the solute includes an acid component and a base component,
the acid component includes at least one selected from the group consisting of an aliphatic sulfonic acid having 1 to 30 carbon numbers, an aromatic sulfonic acid having 6 to 30 carbon numbers, an aromatic carboxylic acid, and an aliphatic carboxylic acid,
the base component includes at least one selected from the group consisting of ammonia, a primary amine, a secondary amine, a tertiary amine, a quaternary ammonium compound, and an amidinium compound,
the electrolytic solution contains the solute at a concentration of 10% by mass or more,
the second solvent contains water, and
an electrical conductivity of the electrolytic solution at 30° C. is 3.0 mS/cm or more and 100 mS/cm or less.