Novel dispersion liquid for solid capacitor, capacitor and preparation method thereof

A technology of capacitors and dispersion liquids, applied in the field of capacitors, can solve the problems of low temperature resistance, poor resistance to repeated charge and discharge, poor long-term high temperature stability of capacitors, and low extraction rate of capacitor capacity, etc., achieve low ESR value and improve high temperature storage stability Sexuality, easy to lead to the effect of capacitor capacity

Active Publication Date: 2019-10-08
广东华鸿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current capacitors prepared with PEDOT / PSS dispersion also have major disadvantages: (1) The long-term high-temperature stability of the capacitor is poor (poor high-temperature resistance), especially the capacitance and the equivalent series resistance (ESR) change significantly at high temperatures. Poor; (2) Affected by the particle size, the lead-out rate of capacitor capacity is lower than that of liquid capacitors; (3) Low temperature resistance and repeated charge and discharge resistance are worse than in-situ polymerization methods

Method used

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  • Novel dispersion liquid for solid capacitor, capacitor and preparation method thereof
  • Novel dispersion liquid for solid capacitor, capacitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A method for preparing a novel dispersion liquid for solid capacitors, comprising the following steps:

[0036](1) 8.8g of sulfonated polystyrene-polyisoprene diblock copolymer with a weight-average molecular weight of 100,000 and 135.5g of deionized water were added to the reaction vessel, and after heating and stirring to dissolve, 6.40g of hydrogen peroxide and 0.006g ferric chloride, be down to room temperature after stirring and dissolving, obtain mixed solution;

[0037] (2) Add 3.0g 3,4-ethylenedioxythiophene to the mixed solution, and carry out polymerization reaction at room temperature;

[0038] (3) After the polymerization reaction stops, the pH value is adjusted, and the PEDOT / PSS dispersion is obtained through aging and removal of inorganic salts, with a yield of 92% and a conductivity of 544 S / cm.

[0039] The dispersion liquid of this example was used as the impregnation liquid, impregnated onto the oxide layer, and then the dispersant was removed by eva...

Embodiment 2

[0041] A method for preparing a novel dispersion liquid for solid capacitors, comprising the following steps:

[0042] (1) Add 8.8g of sulfonated polystyrene-polyisoprene diblock copolymer with a weight average molecular weight of 100,000 and 135.5g of deionized water into the reaction vessel, heat and stir to dissolve, then add 3.20g of hydrogen peroxide and 0.020g ferric chloride, be down to room temperature after stirring and dissolving, obtain mixed solution;

[0043] (2) Add 3.0g 3,4-ethylenedioxythiophene to the mixed solution, and carry out polymerization reaction at room temperature;

[0044] (3) After the polymerization reaction stops, the pH value is adjusted, and the PEDOT / PSS dispersion is obtained through aging and removal of inorganic salts, with a yield of 86% and a conductivity of 728 S / cm.

[0045] The dispersion liquid of this example was used as the impregnation liquid, impregnated onto the oxide layer, and then the dispersant was removed by evaporation to ...

Embodiment 3

[0047] A method for preparing a novel dispersion liquid for solid capacitors, comprising the following steps:

[0048] (1) Add 8.8g of sulfonated polystyrene-polyisoprene diblock copolymer with a weight average molecular weight of 10000 and 135.5g of deionized water into the reaction vessel, heat and stir to dissolve, then add 6.4g of hydrogen peroxide and 0.006g ferric chloride, be down to room temperature after stirring and dissolving, obtain mixed solution;

[0049] (2) Add 12.0g 3,4-ethylenedioxythiophene to the mixed solution, and carry out polymerization reaction at room temperature;

[0050] (3) After the polymerization reaction stops, the pH value is adjusted, and the PEDOT / PSS dispersion is obtained through aging and removal of inorganic salts, with a yield of 80% and a conductivity of 688 S / cm.

[0051] The dispersion liquid of this example was used as the impregnation liquid, impregnated onto the oxide layer, and then the dispersant was removed by evaporation to fo...

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Abstract

The invention discloses a novel dispersion liquid for a solid capacitor, a capacitor and a preparation method thereof. The method is characterized in that the polystyrolsulfon acid is replaced with polyanions such as sulfonated polystyrene block copolymer, acidified polystyrene block copolymer or sulfonated polystyrene graft copolymer, the rigid structure of PSS is improved through modification, the PEDOT structure is granted with a certain flexibility, so performance of a PEDOT / PSS film is improved, a problem that high-temperature resistance, low-temperature resistance and repeated charge anddischarge resistance of the capacitor due to the PSS structure are inferior to the in-situ polymerization method is solved, the polyanions such as the sulfonated polystyrene block copolymer, the acidified polystyrene block copolymer or the sulfonated polystyrene graft copolymer are added simultaneously, the emulsification effect is better, formed milk droplets are smaller, the prepared PEDOT dispersion has a smaller particle size and higher electrical conductivity, triggering the capacitor capacity is made to be easier, and an ESR value of the prepared capacitor is smaller.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a novel dispersion liquid for solid capacitors, a capacitor and a preparation method thereof. Background technique [0002] An electrolytic capacitor generally consists of a porous metal electrode, an oxide layer on the surface of the metal serving as a dielectric, a conductive material introduced into the porous structure, and the like. Commonly used electrolytic capacitors include tantalum electrolytic capacitors, niobium electrolytic capacitors, aluminum electrolytic capacitors, etc., the anode of which is formed by anodic oxidation to have a uniform oxide dielectric layer; a liquid or solid electrolyte forms the cathode of the capacitor. In addition, aluminum capacitors in which the anode electrode is made of valve metal aluminum on which a uniform and electrically insulating aluminum oxide layer is formed as a dielectric by anodization are also commonly used, and a liquid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/15H01G9/04H01G9/00
CPCH01G9/0032H01G9/04H01G9/15
Inventor 张茂华陈伟科黎民
Owner 广东华鸿科技有限公司
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