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Electrode for aluminum electrolytic capacitor and method for manufacturing same

A technology of aluminum electrolytic capacitors and manufacturing methods, applied in the direction of electrolytic capacitor manufacturing, electrolytic capacitors, capacitors, etc., can solve the problems of chemical conversion film or porous layer damage, etc., to suppress the reduction of dielectric constant, realize electrostatic capacity, water resistance excellent compatibility

Active Publication Date: 2020-04-03
NIPPON LIGHT METAL CO LTD +1
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Problems solved by technology

[0003] However, in the case of the organic acid-based chemical conversion liquid, there is a problem that the organic acid-based chemical conversion liquid remaining in the chemical conversion coating or in the porous layer of the aluminum electrode burns during the subsequent thermal depolarization treatment, resulting in Chemical conversions are disrupted by membranes or porous layers

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  • Electrode for aluminum electrolytic capacitor and method for manufacturing same
  • Electrode for aluminum electrolytic capacitor and method for manufacturing same
  • Electrode for aluminum electrolytic capacitor and method for manufacturing same

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Embodiment Construction

[0039] (Electrodes for Aluminum Electrolytic Capacitors)

[0040] 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. As the aluminum electrode, an etched aluminum foil, a porous aluminum electrode in which a porous layer obtained by sintering aluminum powder is laminated on both sides of an aluminum core material, or the like can be used. An etched aluminum foil usually has a porous layer in which tunnel-like pits are formed. In the porous aluminum electrode, for example, porous layers each having a thickness of 5 μm to 1000 μm are formed on both surfaces of an aluminum core material having a thickness of 10 μm to 200 μm. Such a porous layer is a layer obtained by sintering aluminum powders having an average particle diameter D50 of 0.5 μm to 100 μm, and the aluminum powders are sintered while maintaining void...

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Abstract

When manufacturing an electrode for an electrolytic capacitor, in a first hydration step (ST1), an aluminum electrode is immersed in a first hydration processing solution having a temperature of at least 70 DEG C and comprising pure water or an aqueous solution to which phosphoric acid or a phosphate has been added so that the phosphorus concentration is no greater than 4 mass ppm. In a second hydration step (ST2), the aluminum electrode is immersed in a second hydration processing solution to which phosphoric acid or a phosphate has been added so that the phosphorus concentration is 4-5,000 mass ppm, the second hydration processing solution having a pH of 3.0-9.0 and a temperature of at least 70 DEG C. In a chemical conversion step (ST3), at least a boric acid chemical conversion processin which the aluminum electrode is chemically converted in a boric acid-based chemical conversion solution is included, and a chemical conversion coating having a coating withstand voltage of at least200V is formed on the aluminum electrode.

Description

technical field [0001] The present invention relates to an electrode for an aluminum electrolytic capacitor in which an aluminum electrode is chemically converted, and a method for producing the same. Background technique [0002] When manufacturing an electrode for an aluminum electrolytic capacitor in which a chemical conversion film having a film withstand voltage of 200 V or more is formed on the aluminum electrode, after performing a hydration process in which the aluminum electrode is immersed in a hydration treatment solution such as pure water to form a hydration film on the aluminum electrode, A chemical conversion step of chemically converting the aluminum electrode in a chemical conversion liquid is performed. As the chemical conversion liquid, an organic acid-based chemical conversion liquid containing ammonium adipate or the like, or a boric acid-based chemical conversion liquid containing boric acid or a salt thereof is used. When an organic acid-based chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/052H01G9/00
CPCH01G9/052H01G9/045H01G9/055H01G9/048H01G9/0029Y02E60/13
Inventor 榎修平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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