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Electrode foil for electrolytic capacitor and method for manufacturing the same

a technology of electrolytic capacitors and electrolytic foils, which is applied in the direction of electrolytic capacitors, superimposed coating processes, coatings, etc., can solve the problems of difficult to uniformly mix dielectric fine particles into the electrolytic solution, and inability to increase electrostatic capacitance, etc., to achieve less defective dielectrics and high electrostatic capacitan

Inactive Publication Date: 2006-04-13
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] The method of manufacturing an electrode foil for an electrolytic capacitor of the present invention provides a less defective dielectric oxide film and enables high electrostatic capacitance even when usual anodizing is carried out and can provide an electrode foil manufactured by the method.

Problems solved by technology

However, even if hydrate film treatment before anodizing is carried out in a high temperature (90° C. or higher) pure water added with amine, electrostatic capacitance cannot be increased.
However, in the electrode foil in which a dielectric oxide film mixed with dielectric fine particles is formed, it is difficult to uniformly mix the dielectric fine particles into the electrolytic solution.
Therefore, dielectric fine particles cannot be uniformly dispersed in the dielectric oxide film, so that electrostatic capacitance cannot be increased.
Furthermore, when the mixed layer is formed by a sol-gel method, sol / gel particles makes it difficult to obtain a generally called low voltage foil (withstanding voltage: 30V or lower).

Method used

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  • Electrode foil for electrolytic capacitor and method for manufacturing the same
  • Electrode foil for electrolytic capacitor and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] Firstly, pretreatment is carried out by dipping an aluminum foil having a thickness of 100 μm and a purity of 99.98% into an aqueous solution having a phosphoric acid concentration of 1.0 wt % at 90° C. for 60 seconds.

[0038] Then, this aluminum foil is subjected to etching treatment so as to roughen the surface rough.

[0039] The etching treatment was carried out by dipping the aluminum foil into an etching bath filled with electrolytic solution (aluminum concentration in the electrolytic solution was adjusted to 0.1 wt %) at 30° C. which included hydrochloric acid: 5 wt %, aluminum chloride: 2 wt %, sulfuric acid: 0.1 wt %, phosphoric acid: 0.5 wt %, and nitric acid: 0.2 wt %, and then applying alternating voltage (frequency of 35 Hz, for 100 seconds) to a pair of electrode plates.

[0040] After this etching treatment, the aluminum foil was dipped into 10% sulfuric acid aqueous solution to carry out dechlorination, dipped into an aqueous ammonia solution at pH 8 (temperature:...

example 2

[0043] An electrode foil for an electrolytic capacitor was produced in the same manner as Example 1 except that hydrogen ion concentration when the boehmite film was formed was adjusted to pH 9.0.

example 3

[0044] An electrode foil for an electrolytic capacitor was produced in the same manner as Example 1 except that hydrogen ion concentration when the boehmite film was formed was adjusted to pH 10.0.

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Abstract

A manufacturing method including: forming a boehmite film on a roughened surface of an aluminum foil; forming a particulate gel of a valve metal oxide on the surface of the aluminum foil on which the boehmite film is formed; then carrying out heat treatment for forming particulate valve metal oxide; and anodizing.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an electrode foil for an electrolytic capacitor used for various electronic equipments and a method of manufacturing the same. [0003] 2. Background Art [0004] In recent years, as electronic equipment has become smaller, been digitized and had higher reliability, users have strongly demanded smaller electrolytic capacitors. Thus, an anode foil and a cathode foil used for an aluminum electrolytic capacitor have been required to have larger electrostatic capacitance per unit area. [0005] Hereinafter, a typical method of manufacturing an electrolytic capacitor is described. An anode foil having a dielectric oxide film formed on the surface thereof is produced by anodizing an aluminum foil that has an increased effective surface area by etching. Furthermore, a cathode foil that has an increased effective surface area by etching is produced. By winding the anode foil and the cathode foil v...

Claims

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Application Information

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IPC IPC(8): C25D7/06
CPCC25D5/44C25D7/06H01G9/045
Inventor AOYAMA, TATSUJIWATANABE, YOSHIHIRO
Owner PANASONIC CORP
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