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

A technology for aluminum electrolytic capacitors and manufacturing methods, which is applied in the field of electrode foil manufacturing, can solve problems such as uneven corrosion, large capacity dispersion, and low capacity, and achieve the effects of improving distribution uniformity, enhancing uniformity, and improving coordination

Active Publication Date: 2021-11-16
NANTONG HAIXING ELECTRONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the corrosion layer of the low-pressure corrosion foil is a sponge layer, this type of power frequency AC corrosion cannot be corroded deeply, and a higher capacity cannot be obtained.
At the same time, the traditional method is not in place before the aluminum foil is perforated, which will lead to uneven corrosion in the later corrosion process, low capacity and large dispersion.
The manufacturing method of this low-pressure corroded foil product has a low capacity of solid capacitor, which cannot meet the requirement of high specific capacity of solid aluminum foil.

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0024] The 120μm thick soft aluminum foil with a purity of 99.98% is immersed in a hydrochloric acid solution with a volume percentage concentration of 0.1% at a temperature of 70°C for 2 minutes, and then the pre-treated aluminum foil is placed at a temperature of 40°C with a volume percentage concentration of 0.5% phosphoric acid solution, then apply high-frequency pulse current for pre-electrolysis, the time is controlled at 30s, and the frequency is controlled at 12KHz;

[0025] Place the above-mentioned pre-electrolyzed aluminum foil in a mixed solution (mixed with hydrochloric acid, sulfuric acid, oxalic acid and copper sulfate with a mass ratio of 1:1:1:1) for the first electrolytic corrosion, and apply a sine wave with a frequency of 40Hz. wave alternating current, the reaction temperature is 40°C, and the reaction time is 2 minutes;

[0026] Then put it in the middle treatment mixed solution (mixed with hydrochloric acid, sulfuric acid, oxalic acid and copper sulfate ...

Embodiment 2

[0034] The 120μm thick soft aluminum foil with a purity of 99.98% is immersed in a hydrochloric acid solution with a volume percentage concentration of 0.5% at a temperature of 60°C for 1 min, and then the pre-treated aluminum foil is placed at a temperature of 20°C with a volume percentage concentration of 0.3% sulfuric acid solution, and then apply high-frequency pulse current for pre-electrolysis, the time is controlled at 40s, and the frequency is controlled at 14KHz;

[0035] Place the above-mentioned pre-electrolyzed aluminum foil in a mixed aqueous solution (mixed with hydrochloric acid, sulfuric acid, oxalic acid and copper sulfate with a mass ratio of 1:1:1:1) for the first electrolytic corrosion, and apply a sine wave with a frequency of 60Hz. wave alternating current, the reaction temperature is 30°C, and the reaction time is 2 minutes;

[0036] Then put it in the medium to deal with the chemical corrosion in the mixed aqueous solution (mixed with hydrochloric acid,...

Embodiment 3

[0044] The 120μm thick soft aluminum foil with a purity of 99.98% is immersed in a hydrochloric acid solution with a volume percentage concentration of 1% at a temperature of 50°C for 2 minutes, and then the pre-treated aluminum foil is placed at a temperature of 30°C with a volume percentage concentration of 0.4% phosphoric acid solution, then apply high-frequency pulse current for pre-electrolysis, the time is controlled at 50s, and the frequency is controlled at 16KHz;

[0045] Place the above-mentioned pre-electrolyzed aluminum foil in a mixed aqueous solution (mixed with hydrochloric acid, sulfuric acid, oxalic acid and copper sulfate with a mass ratio of 1:1:1:1) for the first electrolytic corrosion, and apply a sine wave with a frequency of 70Hz. Wave alternating current, the reaction temperature is 20°C, and the reaction time is 1.5min:

[0046] Then put it in the middle to deal with the chemical corrosion in the mixed aqueous solution (mixed with hydrochloric acid, sulf...

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Abstract

The invention relates to a method for manufacturing an electrode foil for a solid aluminum electrolytic capacitor, comprising the following steps: immersing the aluminum foil in a hydrochloric acid solution; immersing it in an acidic solution again, and applying a high-frequency pulse current for pre-electrolysis; performing the first First electrolytic corrosion, second electrolytic corrosion; repeat the first electrolytic corrosion and second electrolytic corrosion at least three times; pure water rinse; chemical cleaning solution cleaning; pure water rinse again; high temperature heat treatment, cooling. The combination of pre-acid etching treatment and pre-electrolysis can effectively improve the distribution uniformity of the initial corrosion points formed on the surface of the aluminum foil, thereby greatly improving the uniformity of subsequent electrolytic corrosion. In addition, in several different electrolytic corrosion operations, alternating currents of different frequencies and different waveforms were applied, thereby effectively improving the matching degree of the current in the electrolytic corrosion process and the specific corrosion solution, which is conducive to realizing the aluminum foil itself after electrolytic corrosion. High-thickness corrosion layer characteristics and ultra-high capacity characteristics.

Description

technical field [0001] The invention relates to the technical field of electrode foil manufacturing, 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. [0003] The general manufacturing method of el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/20C25F3/04H01G9/055H01G9/15
CPCC23F1/20C25F3/04H01G9/055H01G9/15
Inventor 孙新明吴春春
Owner NANTONG HAIXING ELECTRONICS