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A method for improving the specific capacity and hydration resistance of aluminum electrolytic capacitors in low-voltage anodized foil

A technology of aluminum electrolytic capacitors and aluminum electrode foils, which is applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of specific capacitance and hydration resistance of formed foils, and achieve suppression of the formation of hydrated oxides, improvement of specific capacitance and water resistance Composite performance, the effect of protecting inner layer components

Active Publication Date: 2021-09-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, improving the specific volume and hydration resistance of anodized foil is the focus of industrial development. The existing chemical formation method will inevitably form a hydrated oxide film on the surface of anodized foil, which will have a negative impact on the specific volume and hydration resistance of the anodized foil. influences

Method used

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  • A method for improving the specific capacity and hydration resistance of aluminum electrolytic capacitors in low-voltage anodized foil
  • A method for improving the specific capacity and hydration resistance of aluminum electrolytic capacitors in low-voltage anodized foil
  • A method for improving the specific capacity and hydration resistance of aluminum electrolytic capacitors in low-voltage anodized foil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Formation process: place the boiled aluminum foil in 10wt.% ammonium adipate aqueous solution for 0-4V anodic oxidation treatment, the pH value of the forming solution is 6.5, and the current density during the boosting process is 20mA / cm 2 , after being converted to 4V, carry out a 10min constant voltage drop process;

[0027] 2) Annealing the formed aluminum foil in an air atmosphere at 550° C. for 5 minutes;

[0028] 3) The first supplementary formation: place the annealed aluminum foil in 10wt.% ammonium adipate aqueous solution for 0-4V anodic oxidation treatment, the pH value of the forming solution is 6.5, and the current density during the boosting process is 20mA / cm 2 , after being converted to 4V, carry out a 5min constant voltage drop process;

[0029] 4) Annealing the aluminum foil formed for the first time in an air atmosphere at 550° C. for 2 minutes;

[0030] 5) The second supplementary formation: place the annealed aluminum foil in 10wt.% ammonium...

Embodiment 2

[0050] 1) The aluminum electrode foil is boiled in high temperature pure water at 100°C for 30s;

[0051] 2) Formation process: place the boiled aluminum foil in 10wt.% ammonium adipate aqueous solution for 0-40V anodic oxidation treatment, the pH value of the forming solution is 6.5, and the current density during the boosting process is 50mA / cm 2 , after forming to 40V, carry out a 10min constant voltage drop process;

[0052] 3) Annealing the formed aluminum foil in an air atmosphere at 550° C. for 5 minutes;

[0053] 4) The first supplementary formation: place the annealed aluminum foil in 10wt.% ammonium adipate aqueous solution for 0-40V anodic oxidation treatment, the pH value of the chemical solution is 6.5, and the current density during the boosting process is 50mA / cm 2 , after forming to 40V, carry out a 5min constant voltage drop process;

[0054] 5) Annealing the aluminum foil formed for the first time in an air atmosphere at 550° C. for 2 minutes;

[0055] 6...

Embodiment 3

[0076] 1) The aluminum electrode foil is boiled in high temperature pure water at 100°C for 30s;

[0077] 2) Formation process: put the boiled aluminum foil in 10wt.% ammonium adipate aqueous solution for 0-80V anodic oxidation treatment, the pH value of the forming solution is 6.5, and the current density during the boosting process is 50mA / cm 2 , after forming to 80V, carry out a 10min constant voltage drop process;

[0078] 3) Annealing the formed aluminum foil in an air atmosphere at 550° C. for 5 minutes;

[0079] 4) The first supplementary formation: place the annealed aluminum foil in 10wt.% ammonium adipate aqueous solution for 0-80V anodic oxidation treatment, the pH value of the forming solution is 6.5, and the current density during the boosting process is 50mA / cm 2 , after forming to 80V, carry out a 5min constant voltage drop process;

[0080] 5) Annealing the aluminum foil formed for the first time in an air atmosphere at 550° C. for 2 minutes;

[0081] 6) T...

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Abstract

A method for improving the specific volume and hydration resistance of aluminum electrolytic capacitor low-voltage anodized foil. The aluminum electrode foil is placed in an ammonium adipate aqueous solution for anodic oxidation treatment; the formed aluminum electrode foil is annealed; the annealed aluminum The electrode foil is placed in an ammonium adipate aqueous solution for anodic oxidation treatment, and then annealed; the annealed aluminum electrode foil is placed in a perfluorodicarboxylic acid containing 4-6 carbon atoms, a perfluorodicarboxylic acid Ammonium salt, perfluorodicarboxylic acid with branched chain and one or more aqueous solutions of ammonium salt of perfluorodicarboxylic acid with branched chain are used for anodic oxidation treatment, and then placed in aqueous solution of ammonium dihydrogen phosphate for anti-oxidation treatment. Hydrated and dried. Under the formation voltage of 4-200V, the formation method of the present invention increases the specific capacity of the anodized foil by 5-10%, and greatly improves the hydration resistance of the prototype foil.

Description

technical field [0001] The invention belongs to the field of aluminum electrolytic capacitors, and in particular relates to a method for improving the specific capacity and hydration resistance of aluminum electrolytic capacitors formed by low-voltage anodization into foil. Background technique [0002] As a traditional energy storage device, aluminum electrolytic capacitors have the functions of rectification, filtering, bypass, coupling and energy storage in the circuit. It has the characteristics of large specific capacity per unit volume, high working electric field strength, self-healing characteristics and low price. It is widely used in the fields of household appliances, automotive electronics, industrial control, aerospace and military, and is an indispensable discrete electronic component in the circuit. With the continuous development of the electronics industry, the performance requirements for aluminum electrolytic capacitors are getting higher and higher, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/00H01G9/045
CPCH01G9/00H01G9/045
Inventor 徐友龙尹子豪邢辰宇
Owner XI AN JIAOTONG UNIV