Electrolytic capacitor-specific electrode member and electrolytic capacitor

Patent metadata

Field	Value
Publication number	US-10923290-B2
Application number	US-201616333420-A
Country	US
Kind code	B2
Filing date	Sep 16, 2016
Priority date	Sep 16, 2016
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

An electrolytic capacitor-specific electrode member is included in an electrolytic capacitor. The electrolytic capacitor-specific electrode member has a wire shape. The electrolytic capacitor-specific electrode member includes a core portion and a porous layer located around the core portion. In a cross section of the electrolytic capacitor-specific electrode member perpendicular to its axial direction, the porous layer includes a plurality of layers arranged concentrically from the core portion toward outside and at least including two layers having different void ratios.

First claim

The invention claimed is:

1. An electrolytic capacitor-specific electrode member included in an electrolytic capacitor, the electrolytic capacitor-specific electrode member having a wire shape, the electrolytic capacitor-specific electrode member comprising:
a core portion; and
a porous layer that is located around the core portion,
in a cross section of the electrolytic capacitor-specific electrode member perpendicular to an axial direction of the electrolytic capacitor-specific electrode member, the porous layer including a plurality of layers that are concentrically arranged from the core portion toward outside and that include at least two layers having different void ratios, wherein:
the core portion and the porous layer are formed from a same base material, and
the porous layer including the at least two layers having different void ratios is formed from a roughened surface of the same base material.

2. The electrolytic capacitor-specific electrode member according to claim 1 , wherein
when a void ratio per unit area in an n-th layer from an outermost layer among the plurality of layers is expressed by f(n) (n being a positive integer), f(2k−1)<f(2k) and f(2k)>f(2k+1) or f(2k−1)>f(2k) and f(2k)<f(2k+1) are satisfied (k being a positive integer).

3. The electrolytic capacitor-specific electrode member according to claim 1 , wherein each of the plurality of layers has a thickness that is approximately uniform in a circumferential direction.

4. The electrolytic capacitor-specific electrode member according to claim 1 , wherein
in a macroscopic view of a cross-sectional shape of the electrolytic capacitor-specific electrode member perpendicular to the axial direction, the cross-sectional shape has a peripheral edge formed in an annular shape not having an angular portion.

5. An electrolytic capacitor comprising:
the electrolytic capacitor-specific electrode member according to claim 1 ;
a counter electrode member disposed to face the electrolytic capacitor-specific electrode member; and
an electrolyte disposed between the electrolytic capacitor-specific electrode member and the counter electrode member.

6. The electrolytic capacitor according to claim 5 , wherein the electrolyte is a solid electrolyte containing a conductive polymer.

Assignees

• Japan Capacitor Ind Co Ltd
• Murata Manufacturing Co

Inventors

• Kubo Hiroshi
• Kanaya Nami
• Fujimoto Kazumasa
• Nobuta Tomoki

Classifications

• H01G9/048 Primary

  characterised by their structure (H01G11/22 takes precedence) · CPC title

• H01G9/028

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