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A preparation method for reducing leakage current of low-voltage electrode foil for aluminum electrolytic capacitors

An aluminum electrolytic capacitor and low-voltage electrode technology, applied in electrolytic capacitors, capacitors, electrolytic coatings, etc., can solve the problem of large leakage current, and achieve the effect of small leakage current, avoiding damage and reducing leakage current.

Active Publication Date: 2020-06-23
乳源县立东电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defect and deficiency of excessive leakage current of the existing low-voltage electrode foil for aluminum electrolytic capacitors, and provide a preparation method for reducing the leakage current of low-voltage electrode foil for aluminum electrolytic capacitors. Agent modification treatment of hydrated alumina, boiling depolarization treatment and reverse electrification treatment, on the one hand, promoted the conversion of hydrated alumina film to dense porous alumina film, on the other hand, well protected the porous layer structure on the surface, The synergistic effect effectively reduces the leakage current of the low-voltage electrode foil and improves the ability to withstand large ripple currents

Method used

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  • A preparation method for reducing leakage current of low-voltage electrode foil for aluminum electrolytic capacitors
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Examples

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Embodiment 1

[0035] A preparation method for reducing the leakage current of a low-voltage electrode foil for an aluminum electrolytic capacitor, comprising the steps of:

[0036] S1. Immerse the low-voltage corrosion foil in the 3-aminopropyltrimethoxysilane coupling agent solution at 50°C, apply a voltage of 5V, and the formation time is 15min;

[0037] S2. Then place it in an aqueous ammonium adipate solution with a mass percentage of 8% to carry out secondary formation and tertiary formation successively. The formation voltages are 50V and 90V respectively, the formation temperature is 85°C, and the formation time is 10min. Treat in pure water at 100°C (boiling water) for 5 minutes;

[0038]S3. The electrode foil is placed in 5% boric acid by mass percentage and 10% borax by mass percentage. At 85°C, reverse power is applied once, with a voltage of 90V (same as the third-level voltage), and the power-on time is 3min;

[0039] S4. Heat treatment at a high temperature of 500°C for 2 min...

Embodiment 2

[0042] A preparation method for reducing the leakage current of a low-voltage electrode foil for an aluminum electrolytic capacitor, comprising the steps of:

[0043] S1. Immerse the low-pressure corroded foil in the vinyltrimethoxysilane coupling agent at 50°C (the mass percentage of the silane coupling agent is 2%, and the pH value is 4), apply a voltage of 8V, and the formation time is 5min;

[0044] S2. Place in 8% by mass ammonium adipate aqueous solution to carry out secondary formation and tertiary formation in sequence, the formation voltages are 50V and 90V respectively, the formation temperature is 85°C, and the formation time is 10min, and then at 90-100 ℃ pure water treatment for 5 minutes;

[0045] S3. Place the electrode foil in a solution of 5% by mass of boric acid and 10% by mass of borax, and at 50°C, apply reverse power once, with a voltage of 90V (same as the third-level voltage), and the power-on time is 3min;

[0046] S4. Heat treatment at a high tempera...

Embodiment 3

[0049] A preparation method for reducing the leakage current of a low-voltage electrode foil for an aluminum electrolytic capacitor, comprising the steps of:

[0050] S1. The low-pressure corroded foil is immersed in an aminopropylmethyldiethoxysilane coupling agent solution at 50°C (the mass percentage of the silane coupling agent is 0.5%, and the pH value is 3), and a voltage of 5V is applied, and the formation time is 10min;

[0051] S2. Place in 8% by mass ammonium adipate aqueous solution to carry out secondary formation and tertiary formation in sequence, the formation voltages are 50V and 90V respectively, the formation temperature is 85°C, and the formation time is 10min, and then at 90-100 ℃ pure water treatment for 5 minutes;

[0052] S3. The electrode foil is placed in boric acid with a mass percentage of 5% and borax with a mass percentage of 10%. At 90°C, a reverse power is applied once, with a voltage of 90V (same as the third-level voltage), and the power-on ti...

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Abstract

The invention discloses a preparation method capable of reducing leakage current of low voltage electrode foil for an aluminum electrolytic capacitor. The preparation method comprises the following steps: dipping the low-voltage corrosion foil in a silane coupling agent solution; applying voltage to perform first-stage formation; performing second-stage formation and third-stage formation on the low-voltage corrosion foil being subjected to first-stage formation in sequence, and then putting the low-voltage corrosion foil in boric acid and borax; performing primary reverse charging; performingfourth-stage formation after high-temperature heat treatment; performing phosphoric acid passivation treatment; performing fifth-stage formation; performing secondary reverse charging; and drying toobtain the low voltage electrode foil for the aluminum electrolytic capacitor. According to the preparation method disclosed by the invention, the first-stage formation treatment with a silane coupling agent, boiling water treatment after the third-stage formation and reverse charging treatment are combined, thereby not only effectively reducing the content of hydrated alumina on the foil surface,but also well protecting the pore structure of an oxide film. The prepared low-voltage electrode foil has high specific capacitance and low loss, significantly-reduced leakage current; the anti-ripple current ability of the electrode foil is improved; and the service life of capacitor is prolonged.

Description

technical field [0001] The invention relates to the technical field of preparation for reducing the leakage current of electrode foils, in particular to a preparation method for reducing the leakage current of low-voltage electrode foils for aluminum electrolytic capacitors. Background technique [0002] With the development of miniaturization of electronic equipment, there is an urgent need to reduce the volume and increase the specific capacity of aluminum electrolytic capacitors. Anodized foil, as the core material in aluminum electrolytic capacitors, plays a decisive role in various characteristics of capacitors. The existing low-voltage anode foil formation process is generally three-stage formation, high-temperature heat treatment, four-stage formation in boric acid and borax solution, adipate aqueous solution, and finally immersion treatment in ammonium dihydrogen phosphate solution. This formation process is adopted. After the prepared low-voltage electrode foil is m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/045H01G9/055C25D11/12C25D11/08C25D11/16
CPCC25D11/08C25D11/12C25D11/16H01G9/045H01G9/055
Inventor 余英凤何凤荣罗向军肖远龙
Owner 乳源县立东电子科技有限公司
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