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Composite electrode and electrolytic capacitor

A technology of electrolytic capacitors and composite electrodes, which is applied in the direction of electrolytic capacitors, solid electrolytic capacitors, liquid electrolytic capacitors, etc., can solve problems such as crack leakage current, oxide layer damage, and inability to completely cover capacitors to achieve good compatibility and increase insulation sex, increase the effect of draping

Active Publication Date: 2015-07-01
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reliability of conductive polymer high-voltage capacitors cannot be improved due to some factors
First, when the oxide layer is anodized aluminum oxide, the aluminum oxide layer is inhomogenous, and its grain boundaries are likely to cause cracks, resulting in increased leakage current
Second, due to the poor properties of the conductive polymer film layer and its brittleness, long-term use is likely to deform itself due to vibration from the environment, or cause oxide layer damage (breakdown)
Third, the film-forming properties of conductive polymers are poor and cannot completely cover the surface of the oxide layer of the capacitor, resulting in high leakage, high impedance and low pass rate of the capacitor
The above factors often lead to low capacitance, a sharp rise in leakage current or even a short circuit, resulting in a decline in the pass rate of high-voltage capacitors

Method used

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  • Composite electrode and electrolytic capacitor
  • Composite electrode and electrolytic capacitor
  • Composite electrode and electrolytic capacitor

Examples

Experimental program
Comparison scheme
Effect test

example 1~4 and comparative example 1~4

[0084] The aluminum oxide dielectric layer positive electrode aluminum foil formed by 143V electrochemical electrolysis reaction and the high surface area negative electrode carbon foil are sandwiched by a separator paper and then wound into a solid electrolytic capacitor element. Then, the element can optionally repair the damaged aluminum oxide dielectric layer with an aqueous organic acid solution. Next, the element was dipped in the modification solution listed in Table 1, and then dried. After that, 3,4-ethylenedioxythiophene (EDOT) monomer solution and ferric toluenesulfonate oxidant solution are impregnated successively, and then the temperature is raised to accelerate the polymerization reaction. During the reaction, the maximum temperature can reach 170 degrees Celsius to ensure the complete reaction . Then put the solid electrolytic capacitor element into the aluminum shell, seal it with a rubber cover, and complete the production of the solid electrolytic capacitor...

example 5 and comparative example 5

[0099] The aluminum oxide dielectric layer positive electrode aluminum foil formed by 175V electrochemical electrolysis reaction and the electrochemically corroded high surface area negative electrode carbon foil are sandwiched by a separator paper and then wound into an electrolytic capacitor element. Then, the element can optionally repair the damaged aluminum oxide dielectric layer with an aqueous organic acid solution. Next, the element was dipped in the modification solution listed in Table 2, and then dried. After that, 3,4-ethylenedioxythiophene (EDOT) monomer solution and ferric toluenesulfonate oxidant solution are impregnated successively, and then the temperature is raised to accelerate the polymerization reaction. During the reaction, the maximum temperature can reach 170 degrees Celsius to ensure the complete reaction . Then put the solid electrolytic capacitor element into the aluminum shell and seal it with a rubber cover to complete the production of the solid...

example 6 and comparative example 6

[0106] A positive electrode aluminum foil with an alumina dielectric layer formed by 65V electrochemical electrolytic reaction and an electrochemically corroded high surface area negative electrode carbon foil are sandwiched by a separator paper and then wound into a solid electrolytic capacitor element. Then, the element can optionally repair the damaged aluminum oxide dielectric layer with an aqueous organic acid solution. Afterwards, impregnate the element in the modification solution listed in Table 3, and then dry it to allow the epoxy resin to undergo a cross-linking reaction. After that, 3,4-ethylenedioxythiophene (EDOT) monomer solution and ferric toluenesulfonate oxidant solution are impregnated successively, and then the temperature is raised to accelerate the polymerization reaction. During the reaction, the maximum temperature can reach 170 degrees Celsius to ensure the complete reaction . Then put the solid electrolytic capacitor element into the aluminum shell a...

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Abstract

Provided is a composite electrode including a metal layer and a composite dielectric layer. The composite dielectric layer includes a metal oxide dielectric layer and a polymer dielectric layer. The composite dielectric layer overlays the metal layer. The polymer dielectric layer includes a nitrogen-containing polymer and overlays the metal oxide dielectric layer. An electrolytic capacitor is also provided. The electrolytic capacitor has a polymer dielectric layer made of a nitrogen-containing polymer, and such polymer dielectric layer is beneficial to increase the insulating property of the metal oxide dielectric layer and the coverage property of the conductive polymer. Thereby, the conventional leakage current can be significantly reduced and the yield can be improved.

Description

technical field [0001] The invention relates to a composite electrode and an electrolytic capacitor. Background technique [0002] For a long time, improving the conductivity of the electrolyte and increasing the pass rate of the capacitor have been the main issues in the development of electrolytic capacitors. The electrolyte with high conductivity can reduce the equivalent series resistance of the capacitor, achieve high frequency low impedance and have high reliability characteristics. Since conductive polymers have higher conductivity than liquid electrolytes or solid organic semiconductor complex salts (such as tetracyanodimethylbenzoquinone (TCNQ) compound salts) used in traditional electrolytic capacitors, and have high-temperature insulation properties, There is no risk of capacitor explosion caused by liquid volatilization in liquid capacitors, so conductive polymers have become the development trend of solid electrolytes used in electrolytic capacitors today. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042H01G9/07H01G9/15
CPCH01G4/14H01G4/10H01G9/145H01G9/151H01G4/008H01G9/022H01G9/028H01G9/035H01G9/07H01G9/15
Inventor 简宏仲杜佾璋蔡丽端
Owner IND TECH RES INST
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