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Electrode sheet for capacitor and its manufacturing method, and electrolytic capacitor

A technology for electrolytic capacitors and electrode sheets, applied in the field of electrode sheets, can solve the problem of inability to reduce leakage current, and achieve the effects of small size, large capacity and small leakage current

Inactive Publication Date: 2007-09-12
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the leakage current cannot be reduced by rolling treatment

Method used

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  • Electrode sheet for capacitor and its manufacturing method, and electrolytic capacitor
  • Electrode sheet for capacitor and its manufacturing method, and electrolytic capacitor
  • Electrode sheet for capacitor and its manufacturing method, and electrolytic capacitor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0093] By arc spraying (spraying heat: 5kJ / l) Al-Zr alloy (Al: 73wt%, Zr: 27wt%) powder to form a 120 μm thick sprayed layer 3 on each surface of the core 2 to obtain an electrode sheet 1 as shown in FIG. 1 . The α-phase content ratio of the Al-Zr alloy powder was 40%. The spraying current was 180A, the spraying mixed gas flow was 250 L / min, and the ratio of the spraying mixed gas was hydrogen:nitrogen:argon=10:10:80 (volume %). A scanning electron micrograph of a section of the obtained electrode sheet is shown in FIG. 2 . The pore content ratio of the sprayed layer 3 was 3% by volume.

[0094] Dip the electrode sheet into 3% (mass%)-H 3 PO 4 solution and boiled at 90° C. for 120 seconds, then washed with running water, and further subjected to ultrasonic cleaning in acetone solvent.

[0095] Also, the electrode sheet was dipped in a 3% (mass %) nitric acid solution for 3 minutes to perform acid cleaning, and then dried at 50° C. for 5 minutes.

[0096] Next, the dried ...

example 2、3、 and comparative example 1 and 2

[0101] In each of these examples, electrode sheets were obtained in the same manner as in Example 1, except that spraying was performed by setting the spraying heat when spraying Al—Zr alloy powder to the value shown in Table 1.

[0102] Alloy powder

example 4、 comparative example 3

[0104] In each example, an electrode sheet was obtained in the same manner as in Example 2, except that Al-Zr alloy powder having the particle diameter shown in Table 2 was used as the Al-Zr alloy powder.

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Abstract

A method of manufacturing an electrode sheet for capacitors comprises the step of forming a sprayed layer of an A1-valve action metal alloy on at least one surface of an aluminum foil (2) by thermally spraying A1-valve action metal alloy powder on the surface of the aluminum foil. At the time of the spraying, a porosity content rate of the sprayed layer (3) is controlled to 20 vol% or less by melting at least a matrix A1 phase of the alloy. The electrode sheet for capacitors manufactured by the method can decrease the porosity content rate of the sprayed layer, which in turn can secure less leakage current and larger capacitance.

Description

[0001] This application claims the benefit of Japanese Patent Application No. 2004-296366, filed October 8, 2004, and US Provisional Application S.N. 60 / 619,031, filed October 18, 2004, the entire contents of which are incorporated herein by reference. [0002] Cross References to Related Applications [0003] This application is filed under 35 U.S.C. §111(a) and claims under 35 U.S.C. §119(e)(1) of U.S. Provisional Application S.N.60 / 619,031 filed October 18, 2004 under 35 U.S.C. §111(b) Benefits on filing date. technical field [0004] The present invention relates to an electrode sheet capable of realizing a capacitor having a large capacity and a small leakage current, a method of manufacturing the electrode sheet, and an electrolytic capacitor. [0005] In this disclosure, including the claims, the word "aluminum" is used including its alloys. Also, in this publication, the word "Al" means aluminum (elementary metal). Background technique [0006] The following descr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/055C23C4/08H01G9/00
CPCC23C4/18H01G9/0029H01G9/045H01G9/055C23C4/08
Inventor 大泷笃史桥本武典
Owner SHOWA DENKO KK
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