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A preparation method of solid-liquid hybrid electrolytic capacitor with low ESR rise rate after high temperature

An electrolytic capacitor and solid-liquid mixing technology, which is applied in the field of capacitors, can solve the problems of high ESR rise rate, etc., and achieve the effects of suppressing the decline of conductivity, improving stability, and reducing leakage current

Active Publication Date: 2021-10-22
湖北海成电子有限公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of high ESR rise rate of solid-liquid hybrid capacitors after high temperature, a preparation method of solid-liquid hybrid electrolytic capacitor with low ESR rise rate after high temperature is provided

Method used

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  • A preparation method of solid-liquid hybrid electrolytic capacitor with low ESR rise rate after high temperature

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Embodiment 1

[0026] A method for preparing a solid-liquid hybrid electrolytic capacitor with a low ESR rise rate after high temperature. The structure of the solid-liquid hybrid electrolytic capacitor is: a cathode foil, a diaphragm, and an anode foil with an oxide film dielectric formed on the surface are wound. winding body, having a conductive polymer solid electrolyte layer in the winding body, and an electrolyte solution for impregnating the winding body with the conductive polymer solid electrolyte layer; the separator is located between the cathode foil and the anode Between the foils, the cathode foil and the anode foil are aluminum valve metal;

[0027] The method for forming the conductive polymer solid electrolyte layer and electrolyte comprises the following steps:

[0028] (1) Immerse the winding body in the PEDOT / PSS aqueous dispersion for 5-10 minutes, then dry it at 125-135°C for 1 hour, then repeatedly impregnate it in the PEDOT / PSS aqueous dispersion for 5-10 minutes, and...

Embodiment 2

[0032] The preparation method of the solid-liquid mixed aluminum electrolytic capacitor with low ESR rise rate after high temperature in this example is the same as that of Example 1, the difference is that the electrolyte is composed of solute, acid-base regulator, solvent and doping supplement according to the following weight Percent composition, the solute is 1% benzoic acid, 5.5% phthalic acid; the acid-base regulator is 0.5% diisopropylmethylamine, 1.5% diisopropylethylamine; the solvent is γ- 30% butyrolactone, 50% ethylene glycol, and 11% polyglycerol; the organic doping supplements containing sulfonic acid groups are 0.3% camphorsulfonic acid and 0.2% 1-anthraquinonesulfonic acid; the pH value of the electrolyte is 2.8; the final mass ratio of the conductive polymer solid electrolyte layer in the winding body to the electrolyte solution is 1:1.

Embodiment 3

[0034]The preparation method of the solid-liquid mixed aluminum electrolytic capacitor with low ESR rise rate after high temperature in this example is the same as that of Example 1, the difference is that the electrolyte is composed of solute, acid-base regulator, solvent and doping supplement according to the following weight Percent composition, the solute is phthalic acid 6%; the acid-base regulator is 1,2,3,4-tetramethylimidazoline 1.5%; the solvent is γ-butyrolactone 30%, sulfolane 23%, ethylene glycol 39.2%; the organic doping supplement containing sulfonic acid groups is 0.2% benzenesulfonic acid, 0.1% 3-sulfobenzoic acid; the pH value of the electrolyte is 3.1; finally in the The mass ratio of the conductive polymer solid electrolyte layer in the wound body to the electrolyte solution is 1:1.5.

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Abstract

The invention relates to a preparation method of a solid-liquid hybrid electrolytic capacitor with a low ESR rise rate after high temperature. The structure of the solid-liquid hybrid electrolytic capacitor is as follows: a cathode foil, a diaphragm and an anode foil with an oxide film dielectric formed on the surface are wound by winding The winding body of the invention has a conductive polymer solid electrolyte layer in the winding body, and an electrolyte solution for impregnating the winding body; the formation method of the conductive polymer solid electrolyte layer and the electrolyte solution includes the following steps: (1) The winding body is The body is immersed in the conductive polymer aqueous dispersion, then dried, and the impregnation and drying steps are repeated at least once to form a winding body with a conductive polymer solid electrolyte layer; (2) Immerse the winding body in the electrolyte That is, the electrolyte includes organic doping supplements containing sulfonic acid groups. The method of the invention can greatly reduce the ESR rise rate of the electrolytic capacitor after high temperature, and improve the ripple current resistance capability and guaranteed life of the solid capacitor.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a method for preparing a solid-liquid hybrid electrolytic capacitor with a low ESR rise rate after high temperature. Background technique [0002] Electrolytic capacitors can be divided into liquid, solid and solid-liquid mixed types. Since the 1990s, aluminum electrolytic capacitors have achieved innovative development by using solid conductive polymer materials instead of electrolytes as cathodes. The solid-liquid mixed aluminum electrolytic capacitors currently on the market are composed of positively polarized aluminum foil and negatively polarized aluminum foil. There is electrolytic paper or diaphragm between the positive and negative aluminum foils, and conductive polymer and electrolyte are adsorbed on the electrolytic paper or diaphragm. Among them, The surface of the negatively polarized aluminum foil has corroded micropores, and the surface of the corroded micropor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/14H01G9/035H01G9/028
CPCH01G9/028H01G9/035H01G9/14
Inventor 丰骏景俊峰成俊峰
Owner 湖北海成电子有限公司
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