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capacitor structure

A capacitor structure and dielectric layer technology, applied in capacitors, electrolytic capacitors, capacitor dielectric layers, etc., can solve the problems of conductive conjugated polymer barriers, conductive conjugated polymers’ voltage resistance characteristics are not as good as liquid electrolytes, etc.

Active Publication Date: 2019-05-14
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although compared with traditional liquid electrolytes, capacitors using conductive conjugated polymers synthesized by in-situ polymerization as electrolytes have the advantages of low impedance and good thermal stability, but the withstand voltage characteristics of conductive conjugated polymers are far inferior to those of liquid electrolytes.
Therefore, low working voltage becomes the biggest obstacle for the use of conductive conjugated polymers in electrolytic capacitors

Method used

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Examples

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Embodiment 1

[0038] Similar to Comparative Example 1, the difference is that before impregnating the solid electrolytic capacitor elements in a mixture of 3,4-ethylenedioxythiophene (EDOT) monomer and 50 wt% ferric toluenesulfonate ethanol solution, the solid electrolytic The capacitor elements are impregnated with PVP (the number average molecular weight is about 1300000) and γ-Al 2 o 3 (particle size between 40nm-80nm) in water (see Table 1). Then heat to 60°C and maintain for one hour, then heat to 125°C and maintain for one hour to remove water, that is, form PVP-γ-Al 2 o 3 The organic-inorganic composite layer is on the alumina dielectric layer. After that, the steps of forming doped PEDOT, sealing, characteristic test, and overvoltage load test are all similar to Comparative Example 1. The electrical properties of the capacitor of this embodiment are listed in Table 2.

Embodiment 2

[0040] Similar to Example 1, the difference is that PVP and γ-Al 2 o 3 The aqueous solution was replaced by an aqueous solution of PVP and ZnO (with a particle size of about 20nm) (see Table 1) to form an organic-inorganic composite layer of PVP-ZnO on the alumina dielectric layer. The electrical properties of the capacitor of this embodiment are listed in Table 2.

Embodiment 3

[0060] The suitable maximum working voltage of the aluminum oxide dielectric layer formed by the electrochemical electrolytic reaction of Examples 3 to 4 and Comparative Examples 4 to 8 at 67V is 30V before being treated with organic and inorganic protective layers. The characteristics of each group of capacitors after sealing are similar. However, after the 40.5V overvoltage load test, the capacitors of Comparative Examples 4 to 6 were short-circuited to varying degrees. In comparative example 5, the combination of aluminum hydroxide and PVP is used as the capacitive protective layer, and in comparative example 6, the combination of boric acid and PVP is used as the capacitive protective layer, and the short circuit rate is higher than that of pure PVP as the capacitive protective layer in comparative example 4. . On the contrary, when the combination of aluminum hydroxide, boric acid, and PVP is used as the capacitor protection layer in Example 3, the short circuit conditio...

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Abstract

A capacitor structure is provided, which includes a positive electrode, a dielectric layer on the positive electrode, and an organic-inorganic composite layer on the dielectric layer. The capacitor structure also includes a negative electrode, and a conductive conjugated polymer electrolyte disposed between the organic-inorganic composite layer and the negative electrode.

Description

technical field [0001] The present invention relates to capacitor structures, and more particularly to the composition of their organic-inorganic composite layers. Background technique [0002] For a long time, one of the main issues in the development of electrolytic capacitors is to increase the conductivity of the electrolyte to reduce the equivalent series resistance of the capacitor and achieve high frequency, low impedance and high reliability characteristics. Since conductive polymers have higher conductivity than liquid electrolytes or solid organic semiconductor complex salts used in traditional electrolytic capacitors, such as TCNQ compound salts, and have moderate high-temperature insulation properties, conductive polymers have become the current The development trend of solid electrolytes used in electrolytic capacitors. [0003] Although compared with traditional liquid electrolytes, capacitors using conductive conjugated polymers synthesized by in-situ polymer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/15H01G9/028H01G9/07
CPCH01G9/15C08K3/22C08K2003/2227C08K2003/2296C08K2201/001C08K2201/003C08K2201/011H01G9/02H01G9/025H01G9/042H01G9/055H01G9/07C08L39/06
Inventor 杜佾璋蔡丽端林甘轩
Owner IND TECH RES INST