Method for preparing aluminum electrolytic capacitor anode foil

A technology of aluminum electrolytic capacitors and anode foils, which can be used in electrolytic capacitors, capacitors, chemical instruments and methods, etc., and can solve problems such as difficulty in specific capacitance of anode foils.

Inactive Publication Date: 2006-02-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing corrosion technology has made the corrosion coefficient of the anode foil gradually approach its theoretical limit, so it is becoming more and more difficult to further increase the specific volume of the anode foil by changing the corrosion technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1: at first soluble bismuth acetate and divalent soluble barium nitrate are dissolved in acetic acid by the stoichiometric ratio of the metal atom of 4: 1 and are made into the A solution that bismuth acetate concentration is 1mol / L; Titanium is dissolved in lactic acid to form B solution with a titanium chloride concentration of 1.5mol / L; 4 Ti 4 o 15 The stoichiometric ratio of the metal atoms in the mixture is mixed to prepare C solution; then add water to adjust the C solution to a concentration of 0.3mol / L, add ethanolamine to adjust the pH value to 2 to make D solution; immerse the corroded aluminum foil in D solution for 0.5 minutes; Take it out and dry it and put it directly into the air at 600°C for heat treatment for 5 minutes to form a bismuth titanate-based ferroelectric film; put the corroded aluminum foil forming the bismuth titanate-based ferroelectric film into ammonium azelate with a mass concentration of 8%. In the solution, anodize at a vo...

Embodiment 2

[0008] Embodiment 2: at first soluble bismuth nitrate and divalent soluble strontium acetate are dissolved in acetic acid by the stoichiometric ratio of the metal atom of 4:1 and are made into the A solution that bismuth nitrate concentration is 3mol / L; Then soluble titanium sulfate Dissolved in lactic acid and made into solution B whose concentration of titanium sulfate is 1.0mol / L; 4 Ti 4 o 15 The stoichiometric ratio of the metal atoms in the mixture is mixed to prepare C solution; then add water to adjust the concentration of C solution to 0.1mol / L, add triethanolamine to adjust the pH value to 4 to make D solution; immerse the corroded aluminum foil in D solution for 5 minutes Take it out and dry it and put it directly into the air at 500°C for heat treatment for 15 minutes to form a bismuth titanate-based ferroelectric thin film; put the corroded aluminum foil formed into a bismuth titanate-based ferroelectric thin film into dihydrogen phosphate with a mass concentratio...

Embodiment 3

[0009] Embodiment 3: at first soluble bismuth chloride and divalent soluble zinc acetate are dissolved in acetic acid by the stoichiometric ratio of the metal atom of 4: 1 and are made into the A solution that bismuth chloride concentration is 4mol / L; Tetrabutyl titanate is dissolved in lactic acid to form B solution whose concentration of tetrabutyl titanate is 0.5mol / L; 4 Ti 4 o 15 , the stoichiometric ratio of the metal atoms in the solution was mixed to prepare C solution; then add water to adjust the C solution to a concentration of 0.05mol / L, then add ethanolamine to adjust the pH value to 5 to make D solution; immerse the corroded aluminum foil in D solution for 4 minutes Take it out and dry it and put it directly into the air at 450°C for heat treatment for 100 minutes to form a bismuth titanate-based ferroelectric film; put the corroded aluminum foil formed into a bismuth titanate-based ferroelectric film into adipic acid with a mass concentration of 10%. In the amm...

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PUM

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Abstract

Disclosed is a method for making anode foil of aluminum electrolytic capacitor which comprises steps of: preparing bismuth titanate or its predecessors with sol-gel processing; coating the predecessors on the etched aluminum foil surface with leaching method; forming a bismuth titanate nanometer file of high dielectric constant after heating; forming a compound dielectric membrane on the etched aluminum foil by anode oxidation processing. The inventive method has the advantage of increasing the specific capacity of anode aluminum foil.

Description

technical field [0001] The invention relates to a preparation method of an electronic material, in particular to a preparation method of an anode foil of an aluminum electrolytic capacitor. Background technique [0002] The specific capacitance of an aluminum electrolytic capacitor is mainly determined by the specific capacitance of the anode aluminum foil, which is theoretically proportional to the dielectric constant and specific surface area of ​​the anode dielectric film, and inversely proportional to the thickness of the dielectric film. The dielectric constant of alumina produced by the existing chemical formation technology is about 8-10, all of which are less than 10. Generally, there is a certain proportional relationship between the thickness of the dielectric aluminum oxide film and the working voltage. Under a certain operating voltage, the thickness of the dielectric aluminum oxide film is a constant. To increase the specific capacitance of the anode aluminum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/045H01G9/055H01G9/00B01J19/00C25D11/02C25D13/00
Inventor 徐友龙杜显锋王杰
Owner XI AN JIAOTONG UNIV
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