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Formed foil for long-life aluminum electrolytic capacitor and preparation process thereof

An aluminum electrolytic capacitor and its preparation technology are applied in the field of electrochemistry, which can solve the problems of shortened service life, capacitor failure, and large heat generation, and achieve the effects of prolonging life, reducing internal resistance and heat generation, and increasing content

Pending Publication Date: 2021-08-03
XINJIANG INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the influence of anodic oxide film performance on capacitor life.
γ1-Al 2 o 3 Although the crystalline oxide film is dense and stable, its internal resistance is large, and the heat generated when the voltage fluctuates is large, causing the capacitor to fail and shorten its service life

Method used

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  • Formed foil for long-life aluminum electrolytic capacitor and preparation process thereof
  • Formed foil for long-life aluminum electrolytic capacitor and preparation process thereof
  • Formed foil for long-life aluminum electrolytic capacitor and preparation process thereof

Examples

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Embodiment 1

[0047] A preparation process of formed foil for long-life aluminum electrolytic capacitors, the specific steps are:

[0048] S1. Preparation of porous membrane (pre-oxidized membrane)

[0049] Use high-voltage corrosion foil for aluminum electrolytic capacitors, and cut into several foils with an area of ​​300×200. After the foil is washed with deionized water, it is connected to the positive pole of the DC power supply, and the opposite electrode is made of a stainless steel electrolytic cell to boost the voltage with a constant current (the current density is 6mA / cm 2 ) for anodizing. The electrolyte is prepared with 0.3 mol / L phosphoric acid aqueous solution and deionized water, and the resistivity of the deionized water is greater than 10MΩ.cm at a room temperature of 25°C. The oxidation temperature is 20°C, the oxidation time is 15 minutes, and the voltage is 15V, and several slices of parallel samples are prepared. After the anodized aluminum foil is taken out, it is ...

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Abstract

The invention relates to a formed foil, and particularly relates to a formed foil for a long-life aluminum electrolytic capacitor and a preparation process thereof, and belongs to the technical field of electrochemistry. The preparation process comprises the following steps of: oxidizing a high-pressure corrosion foil in a phosphoric acid aqueous solution at a low temperature through an anodic oxidation method to form a front oxide film, and performing low-current formation by adopting a low-temperature and low-concentration sodium hydroxide solution on the basis of the front oxide film to prepare the formed foil for the long-life aluminum electrolytic capacitor. A capacitor aging contrast test shows that an amorphous oxide film in the formed foil is easier to repair by an electrolyte in the capacitor, and the loose amorphous oxide film can be partially converted into a compact crystal form oxide film (gamma 1-Al2O3) under the action of high temperature during aging and durability experiments, so that the capacity of the capacitor is improved, the loss and the leakage current are kept stable for a long time, and the performance of the capacitor is greatly improved.

Description

technical field [0001] The invention relates to a formed foil, in particular to a formed foil for a long-life aluminum electrolytic capacitor and a preparation process thereof, belonging to the technical field of electrochemistry. Background technique [0002] Aluminum anodized film is the working medium of electrolytic capacitors, and its performance directly affects the life of aluminum electrolytic capacitors. The structure of the anodized film mainly consists of amorphous Al 2 o 3 and γ-Al 2 o 3 or γ1-Al 2 o 3 and a small amount of hydrated oxide film. The crystalline oxide film has a larger relative dielectric constant and a smaller withstand voltage thickness, and its capacitance is higher than that of the amorphous oxide film, which is conducive to the miniaturization of capacitors. Therefore, in recent years, many colleges, research institutions and enterprise technicians have devoted themselves to the research on the properties of formed foil high dielectric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/12C25D11/08C25D11/06H01G9/045H01G9/055
CPCC25D11/12C25D11/08C25D11/06H01G9/045H01G9/055
Inventor 董晓红黄勇尹君驰刘克毅武玉柱李菁曹长虹
Owner XINJIANG INST OF ENG
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