US 12,283,434 B2
Solid electrolytic capacitor element and solid electrolytic capacitor
Takuya Kurimoto, Kyoto Fu (JP); and Hitoshi Fukui, Saga Ken (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/923,767
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Apr. 30, 2021, PCT No. PCT/JP2021/017218
§ 371(c)(1), (2) Date Nov. 7, 2022,
PCT Pub. No. WO2021/230111, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 2020-086103 (JP), filed on May 15, 2020.
Prior Publication US 2023/0178306 A1, Jun. 8, 2023
Int. Cl. H01G 9/025 (2006.01); H01G 9/04 (2006.01); H01G 9/042 (2006.01)
CPC H01G 9/025 (2013.01) [H01G 9/0425 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A solid electrolytic capacitor element comprising:
an anode body,
a dielectric layer formed at a surface of the anode body, and
a cathode portion that covers at least a part of the dielectric layer,
wherein:
the cathode portion includes a solid electrolyte layer that covers at least a part of the dielectric layer,
the solid electrolyte layer includes a solid electrolyte,
the solid electrolyte includes a conductive polymer and a dopant component,
the dopant component includes an aromatic compound in which an aromatic ring has a plurality of functional groups,
the plurality of functional groups include an electron-withdrawing functional group, and include an electron-donating functional group or do not include an electron-donating functional group,
a relationship (m1−m2)≥2 is satisfied, where m1 and m2 represent the number of the electron-withdrawing functional groups and the number of the electron-donating functional groups in one molecule of the aromatic compound, respectively, and
the solid electrolyte included in the solid electrolyte layer has a weight reduction ratio of 3% or less when measured through thermogravimetric analysis in which the solid electrolyte is heated to 180° C., is kept at 180° C. for 20 minutes, is cooled from 180° C. to 30° C., and is then heated from 30° C. to 260° C. at a rate of 20° C./min.