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Method for producing electrode for aluminum electrolytic capacitor

A technology of aluminum electrolytic capacitors and manufacturing methods, which is applied in the manufacture of electrolytic capacitors, electrolytic capacitors, capacitors, etc., can solve the problems of decreased electrostatic capacitance, porous blockage, and decreased surface area of ​​blocked parts, so as to suppress the decrease in hydration resistance and inhibit the hydration resistance. The effect of reducing the stability and improving the electrostatic capacitance

Active Publication Date: 2020-10-30
NIPPON LIGHT METAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, if the boiling time is prolonged to increase the thickness or amount of the hydrated film, it will cause the porous part of the aluminum electrode to be blocked by the hydrated film.
If the clogging occurs due to the hydration coating, the electrolyte cannot penetrate into the clogged part during the subsequent chemical conversion, and the chemical conversion coating cannot be properly formed, resulting in a decrease in the hydration resistance of the chemical conversion coating
Also, the surface area of ​​the clogged part is reduced, so the electrostatic capacitance is reduced
In particular, when the thickness of the porous layer is 400 μm or more, the porous part is likely to be clogged due to boiling, so if the boiling time is prolonged to increase the electrostatic capacitance, the hydration resistance of the chemical conversion coating will deteriorate and the electrostatic capacitance will also decrease. The problem

Method used

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  • Method for producing electrode for aluminum electrolytic capacitor
  • Method for producing electrode for aluminum electrolytic capacitor
  • Method for producing electrode for aluminum electrolytic capacitor

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Embodiment Construction

[0036]In the present invention, when producing an electrode for an aluminum electrolytic capacitor, the surface of the aluminum electrode is chemically converted to produce an electrode for an aluminum electrolytic capacitor. In the following description, a porous aluminum electrode in which a porous layer formed by sintering aluminum powder is laminated on both surfaces of an aluminum core material is used as the aluminum electrode, and the porous aluminum electrode is chemically converted. Describe the center. Next, after describing the configuration of the aluminum electrode, the chemical conversion method will be described.

[0037] (composition of aluminum electrodes)

[0038] figure 1 is an explanatory diagram showing a cross-sectional structure of an aluminum electrode to which the present invention is applied, figure 1 (a) and (b) are photographs taken with an electron microscope magnifying the cross section of the aluminum electrode 120 times, and photographs taken...

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Abstract

Provided is a production of an electrode for an aluminum electrolytic capacitor, wherein in a first hydration treatment step (ST1), an aluminum electrode provided with a porous layer is immersed in afirst hydration treatment solution having a temperature of 80 DEG C or higher to form a hydrated film on the aluminum electrode, and then in a dehydration step (ST2), the aluminum electrode is heatedin an atmosphere having a temperature of 150-350 DEG C. Next, in a second hydration treatment step (ST3), the aluminum electrode is immersed in a second hydration treatment solution having a temperature of 80 DEG C or higher to form a hydrated film on the aluminum electrode, and then in a chemical conversion step, the aluminum electrode is chemically converted to a voltage of 400 V or higher, andfurther to 600 V or higher.

Description

technical field [0001] The present invention relates to a method for producing an electrode for an aluminum electrolytic capacitor by chemically converting an aluminum electrode. Background technique [0002] As a method of manufacturing an electrode for an aluminum electrolytic capacitor for medium and high voltages, it is known to perform a hydration treatment step of boiling an aluminum foil in pure water (pure water boiling step) before performing a chemical conversion step. By performing the hydration treatment step, the electrostatic capacity after chemical conversion can be increased. This is because a highly crystalline chemical conversion coating can be obtained when pseudo-boehmite or the like in the hydration coating is dehydrated and converted into a chemical conversion coating. When the hydrated film is obtained only through the general hydration treatment steps, the amount and thickness of the hydrated film will be increased by prolonging the boiling time, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/00H01G9/052
CPCH01G9/052H01G9/045H01G9/055H01G9/0032H01G9/0036H01G9/032H01G9/048H01G9/0029
Inventor 清水裕太片野雅彦平敏文藤本和也曾根慎也
Owner NIPPON LIGHT METAL CO LTD
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