A kind of manufacturing method of electrode foil for solid aluminum electrolytic capacitor

A technology of aluminum electrolytic capacitor and manufacturing method, applied in solid electrolytic capacitors, electrolytic capacitors, capacitors and other directions, can solve the problems of high temperature resistance, low capacity extraction rate, etc., to reduce disturbance, improve high temperature stability, and improve capacity extraction rate. Effect

Active Publication Date: 2021-01-26
NANTONG HAIXING ELECTRONICS +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

If the electrode foil for ordinary aluminum electrolytic capacitors is used directly in solid aluminum electrolytic capacitors, it will have the defects of low capacity lead-out rate and high temperature resistance

Method used

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Embodiment Construction

[0028] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with examples, which are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

[0029] A method for manufacturing an electrode foil for a solid aluminum electrolytic capacitor, comprising the following steps:

[0030] (a) Pre-treatment in hydrochloric acid solution with low-voltage electronic light foil;

[0031] (b) The anode foil obtained in step (a) is galvanically corroded in a mixed solution of hydrochloric acid and sulfuric acid;

[0032] (c) The anode foil obtained in step (b) is subjected to hole expansion and galvanic corrosion in a mixed solution of hydrochloric acid, sulfuric acid, oxalic acid and phosphoric acid;

[0033] (d) washing the anode foil obtained in step (c) in tap water;

[0034] (e) soaking the anode foil obtained in step (d) in a mixed sol...

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Abstract

The invention relates to a method for manufacturing an electrode foil for a solid aluminum electrolytic capacitor, which includes two parts: corrosion and formation, and the corrosion part includes: pretreatment of the electronic light foil in a hydrochloric acid solution; electroporation corrosion in a mixed solution of hydrochloric acid and sulfuric acid; Corrosion, cleaning and immersion for hole enlargement; washing with tap water and annealing treatment to obtain corroded foil for solid aluminum electrolytic capacitors. Annealing heat treatment; secondary annealing heat treatment after secondary electrochemical anodizing and tertiary electrochemical anodizing; three annealing heat treatment after fourth electrochemical anodizing; soaking in phosphoric acid, soaking in ammonium dihydrogen phosphate, drying after cleaning; Electrode foil for solid aluminum electrolytic capacitors. The invention can effectively reduce the disturbance of the tip current, reduce the generation of invalid small holes in the corrosion process, improve the capacity extraction rate of the solid foil, effectively improve the quality of the oxide film, maintain stable performance, and effectively improve the high temperature stability of the solid capacitor.

Description

technical field [0001] The invention relates to a method for manufacturing an electrode foil, in particular to a method for manufacturing an electrode foil for a solid aluminum electrolytic capacitor. Background technique [0002] Solid aluminum electrolytic capacitors use solid electrolyte. The solid electrolyte is not easy to flow in the nanoporous structure of the electrode foil, and cannot completely fill the holes. When used, there is a problem with the capacity extraction rate. It has special requirements for the microporous shape of the aluminum electrode foil, and it is ineffective to reduce the requirement holes to increase the capacity extraction rate. At the same time, solid aluminum electrolytic capacitors need to undergo carbonization high-temperature heat treatment steps during the manufacturing process, which puts forward higher requirements for the high-temperature resistance of aluminum electrode foils. If the electrode foil for ordinary aluminum electrolyt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/055H01G9/15C25F3/04C25D11/06C25D11/18
CPCC25D11/06C25D11/18C25F3/04H01G9/055H01G9/15
Inventor 周小兵赵宇飞
Owner NANTONG HAIXING ELECTRONICS
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