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Preparation method of water-soluble conductive polymer and application of water-soluble conductive polymer in preparation of solid aluminum electrolytic capacitor

A conductive polymer, water-soluble technology, applied in the direction of solid electrolytic capacitors, electrolytic capacitors, capacitors, etc., can solve the problems of polymer particle diameter increase, conductivity decrease, etc., to achieve small molecular particle size, low series resistance, reduce The effect of production costs

Pending Publication Date: 2022-04-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the current technology shows the doping of poly(3,4-ethylenedioxythiophene) with insulating polystyrene sulfonate in order to increase the water solubility of poly(3,4-ethylenedioxythiophene) in solid aluminum electrolytic capacitors, which leads to an increase in the diameter of the polymer particles , the electrical conductivity is reduced; in order to improve its electrical conductivity, it is necessary to post-treat the polymer film or add additives to the polymer dissolution

Method used

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  • Preparation method of water-soluble conductive polymer and application of water-soluble conductive polymer in preparation of solid aluminum electrolytic capacitor
  • Preparation method of water-soluble conductive polymer and application of water-soluble conductive polymer in preparation of solid aluminum electrolytic capacitor
  • Preparation method of water-soluble conductive polymer and application of water-soluble conductive polymer in preparation of solid aluminum electrolytic capacitor

Examples

Experimental program
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Embodiment 1

[0041] A method for preparing a chip-type solid aluminum electrolytic capacitor based on a water-soluble polymer cathode, comprising the following steps:

[0042] 1) Preparation of water-soluble monomer material (S-EDOT):

[0043] The reaction equation is as follows:

[0044]

[0045] First, 500g 3,4-dihydroxythiophene-2,5-dicarboxylate diethyl ester, 400g potassium carbonate and 800gC 3 h 6 OBr 2 , dissolved in 1.5L N,N-dimethylformamide (DMF) and 1.5L dimethyl sulfoxide (DMSO) mixed solvent for reaction. Then, 0.3L 2M potassium hydroxide solution was added to the above mixed solution, and 0.5L hydrochloric acid was added for acidification to obtain the product 2-(hydroxymethyl)-2,3-dihydrothieno[3,4-B][ 1,4] Dioxine-5,7-dicarboxylic acid. 100 g of the above product, 300 g of copper oxide and 40 g of pyridine were mixed to obtain the product hydroxymethyl EDOT (HMEDOT). The above 100HMEDOT, 100g sodium hydride and 30gC 5 h 10 o 2 S was mixed and dissolved in 0.2L te...

Embodiment 2

[0052] The difference from Example 1 is that the acidic solution in step 1) is 0.5L phosphoric acid. The catalyst uses 25g copper 8-hydroxyquinoline; in step 3, the anode foil passed through step 2 is immersed in 10g S-EDOT monomer and 10g sodium benzenesulfonate dissolved in 10g pure water, and the electrochemical polymerization current density 5mA, the polymerization time is 30min to carry out the polymerization reaction to obtain a water-soluble conductive polymer. The degree of polymerization of the water-soluble conductive polymer prepared in this example is 100.

Embodiment 3

[0054] The difference from Example 1 is that in step 1), the acidic solution is 0.4L nitric acid. Catalyst adopts 30g isoquinoline. In step 2), 80g of S-EDOT monomer and 30g of potassium permanganate were dissolved in 0.08L of oxalic acid aqueous solution, and stirred for 12h for oxidative polymerization to obtain a water-soluble conductive polymer solution. The water-soluble conductive polymer prepared in this example The degree of polymerization of the product is 70. In step 3), a wound-type anode aluminum element is used as the anode, immersed in a water-soluble conductive polymer for 3 minutes, and dried at 150°C for 36 hours; after repeating this step 10 times, the element is packaged in a shell to obtain an anode based on Wound-type solid aluminum electrolytic capacitors with water-soluble conductive polymer cathodes, such as figure 2 shown.

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Abstract

The invention discloses a preparation method of a water-soluble conductive polymer and application of the water-soluble conductive polymer in preparation of a solid aluminum electrolytic capacitor, and belongs to the technical field of electronic materials and electronic components. The preparation process of the solid-state aluminum electrolytic capacitor mainly comprises the following steps: firstly preparing an S-EDOT monomer, then carrying out polymerization reaction on the S-EDOT monomer by adopting a chemical method or an electrochemical method to form a water-soluble conductive polymer, and then taking the water-soluble conductive polymer as a cathode to form a sheet-type or winding-type solid-state aluminum electrolytic capacitor. Compared with the traditional PEDOT: PSS, the water-soluble conductive polymer has the advantages of better water solubility, smaller molecular particle size and higher conductivity.

Description

technical field [0001] The invention belongs to the technical field of electronic materials and electronic components, and in particular relates to a preparation method of a water-soluble conductive polymer and its application in the preparation of solid aluminum electrolytic capacitors. Background technique [0002] Today, the importance of aluminum electrolytic capacitors in the field of electronic components has been gradually revealed. With the wide range of applications and the continuous improvement of extreme conditions such as 5G base stations, small size, large capacity, low equivalent series resistance, high frequency and low impedance, and high reliability will become the main development direction of solid aluminum electrolytic capacitors. At present, polyacetylene, polythiophene, polyaniline, polypyrrole and other π-π conjugated conductive polymers that can act as conductive cathodes in solid aluminum electrolytic capacitors, among which poly 3,4-ethylenedioxyth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G61/12H01G9/00H01G9/042H01G9/15
Inventor 熊礼龙武晶晶杜显锋
Owner XI AN JIAOTONG UNIV