Electrolytic capacitor and method for producing same

Patent metadata

Field	Value
Publication number	US-2018158618-A1
Application number	US-201815870839-A
Country	US
Kind code	A1
Filing date	Jan 12, 2018
Priority date	Jul 31, 2015
Publication date	Jun 7, 2018
Grant date	—

Abstract

An electrolytic capacitor includes: an anode body; a dielectric layer formed on the anode body; a first conductive polymer layer which covers at least a portion of the dielectric layer; and a second conductive polymer layer which covers at least a portion of the first conductive polymer layer. The first conductive polymer layer includes a first layer and a second layer. The first layer contains a first conductive polymer and a first dopant, and covers at least a portion of the dielectric layer. The second layer is formed on the first layer, and contains a first silane compound. The second conductive polymer layer contains a second conductive polymer, a second dopant, and a basic compound.

First claim

What is claimed is:

1 . An electrolytic capacitor comprising:
an anode body; a dielectric layer formed on the anode body; a first conductive polymer layer covering at least a part of the dielectric layer; and a second conductive polymer layer covering at least a part of the first conductive polymer layer, wherein: the first conductive polymer layer includes:
a first layer containing a first conductive polymer and a first dopant, and covering at least a part of the dielectric layer; and
a second layer formed on the first layer, and containing a first silane compound, and
the second conductive polymer layer contains a second conductive polymer, a second dopant, and a first basic compound.

2 . The electrolytic capacitor according to claim 1 , wherein at least a part of the second layer is interposed between the first layer and the second conductive polymer layer.

3 . The electrolytic capacitor according to claim 1 , wherein a molecular weight of the first dopant is smaller than a molecular weight of the second dopant.

4 . The electrolytic capacitor according to claim 1 , wherein the first dopant is a monomer compound having an anionic group.

5 . The electrolytic capacitor according to claim 1 , wherein the first basic compound is an amine compound.

6 . The electrolytic capacitor according to claim 1 , wherein the first silane compound is a silane coupling agent.

7 . The electrolytic capacitor according to claim 1 , wherein the first layer further contains a second silane compound.

8 . The electrolytic capacitor according to claim 7 , wherein:
the second conductive polymer layer further contains a third silane compound, and a proportion of the first silane compound in the first conductive polymer layer is higher than a proportion of the third silane compound in the second conductive polymer layer.

9 . The electrolytic capacitor according to claim 1 , wherein the second conductive polymer layer does not contain a silane compound.

10 . The electrolytic capacitor according to claim 1 , wherein:
the first conductive polymer layer further contains a second basic compound, and a proportion of the first basic compound in the second conductive polymer layer is higher than a proportion of the second basic compound in the first conductive polymer layer.

11 . The electrolytic capacitor according to claim 1 , wherein the first conductive polymer layer does not contain a basic compound.

12 . The electrolytic capacitor according to claim 1 , wherein a thickness of the second conductive polymer layer is larger than a thickness of the first conductive polymer layer.

13 . The electrolytic capacitor according to claim 1 , wherein the second conductive polymer layer is denser than the first conductive polymer layer.

14 . The electrolytic capacitor according to claim 1 , wherein
the second conductive polymer layer includes: a third layer containing the first basic compound; and a fourth layer formed on the third layer and containing the second conductive polymer and the second dopant.

15 . The electrolytic capacitor according to claim 14 , wherein:
the second conductive polymer layer has a plurality of third layers including the third layer, and a plurality of fourth layers including the fourth layer, and each of the plurality of third layers and each of the plurality of fourth layers are alternately stacked.

16 . The electrolytic capacitor according to claim 1 , wherein:
the first conductive polymer is obtained by polymerizing a precursor of the first conductive polymer on the dielectric layer, and the second conductive polymer layer is obtained by using a dispersion liquid or a solution which contains the second conductive polymer.

17 . A method for producing an electrolytic capacitor, the method comprising:
a first step of forming a first conductive polymer layer covering at least a part of a dielectric layer of an anode body, which is provided with the dielectric layer, by forming a first layer on the dielectric layer, the first layer containing a first conductive polymer and a first dopant and covering at least a part of the dielectric layer, and forming a second layer containing a first silane compound on the first layer; and a second step of forming a second conductive polymer layer on the first conductive polymer layer, the second conductive polymer layer containing a second conductive polymer, a second dopant and a basic compound, and covering at least a part of the first conductive polymer layer.

18 . The method for producing an electrolytic capacitor according to claim 17 , wherein in the first step, the first layer is formed on the dielectric layer by polymerizing a precursor of the first conductive polymer in the presence of the first dopant, and the anode body provided with the first layer is impregnated with a first treatment liquid containing the first silane compound and dried to form the second layer on the first layer.

19 . The method for producing an electrolytic capacitor according to claim 17 , wherein the second step includes a step α, which includes:
impregnating the anode body having the first conductive polymer layer that is obtained in the first step with a second treatment liquid containing the basic compound and then performing drying; and
impregnating the anode body with a third treatment liquid containing the second conductive polymer and the second dopant and then performing drying.

20 . The method for producing an electrolytic capacitor according to claim 19 , wherein the step α is repeated multiple times.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Yamaguchi Nobuyuki
• Fukuchi Koji
• Okamoto Koji
• Iwasa Tetsuro
• Kobayashi Takahiro
• Tanaka Yasuo
• Morioka Ryo

Classifications

• H01G9/15

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

• C08G2261/512

  Hole transport · CPC title

• H01G9/028 Primary

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

• C08G2261/3223

  containing one or more sulfur atoms as the only heteroatom, e.g. thiophene · CPC title

• C08G61/126

  with a five-membered ring containing one sulfur atom in the ring · CPC title