Preparation method of PEDOT/PSS dispersion liquid and preparation method of high pressure solid capacitor

A technology of dispersion liquid and reaction liquid, which is applied in the direction of solid electrolytic capacitors, capacitor parts, capacitor electrolyte/absorbent, etc., and can solve problems such as inapplicability, high concentration viscosity, poor film formation and poor conductivity

Active Publication Date: 2014-12-17
STARZEON ELECTRONICS DONGGUAN +1
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AI Technical Summary

Problems solved by technology

However, it is difficult to increase the solid content of the dispersion used, usually less than 3%, and the viscosity is relatively high. If the solid content is further increased, the viscosity will increase sharply and become unstable.
The impregnation process often requires more than three cycles to form enough electrolyte inside the core to achieve proper performance. However, due to the winding structure of the capacitor core, it can only be impregnated twice. After two impregnations, the bottom of the capacitor is formed. If the conductive polymer is blocked, it is meaningless to further increase the number of impregnations. Therefore, on the premise of not increasing the viscosity of the impregnating liquid and reducing the stability, the key point is to increase its solid content.
In addition, for capacitors above 35V, the holes on the surface of the anodic oxide film are large, and the dispersion liquid penetrates into the holes to form electrolytes. However, for capacitors below 16V, the holes on the surface of the oxide film are very small. If the particle size of the dispersion is not small enough , will not be able to enter its interior, resulting in a very low capacity lead
This is also the reason why the current dispersion liquid is mainly used for products above 50V, and it is not suitable for products below 16V.
[0006] In summary, the traditional PEDOT / PSS dispersion has insufficient concentration and too high viscosity, resulting in poor film-forming properties and poor electrical conductivity.

Method used

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  • Preparation method of PEDOT/PSS dispersion liquid and preparation method of high pressure solid capacitor
  • Preparation method of PEDOT/PSS dispersion liquid and preparation method of high pressure solid capacitor
  • Preparation method of PEDOT/PSS dispersion liquid and preparation method of high pressure solid capacitor

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preparation example Construction

[0024] Such as figure 1 The preparation method of the PEDOT / PSS dispersion liquid of one embodiment shown, comprises the steps:

[0025] S110. Prepare an aqueous solution of polystyrene sulfonic acid with a weight-average molecular weight of 2,000 to 50,000, add 3,4-ethylenedioxythiophene and an emulsifier, stir and react until a transparent and uniform system is formed, then add iron p-toluenesulfonate and ammonium sulfate, keeping the reaction temperature below 25°C and fully reacting to obtain the first reaction liquid, which is dialyzed to remove impurities to obtain the first dispersion liquid.

[0026] Preferably, in S110, the weight average molecular weight of polystyrene sulfonic acid is 5000-20000.

[0027] Preferably, the mass ratio of polystyrenesulfonic acid with a weight average molecular weight of 2000-50000, 3,4-ethylenedioxythiophene and emulsifier is 30:10:5.

[0028] Preferably, the mass ratio of 3,4-ethylenedioxythiophene, ferric toluenesulfonate and ammon...

Embodiment 1

[0049] Take 1000mL of polystyrene sulfonic acid aqueous solution with a weight average molecular weight of 5000 and a solid content of 3%, put it in a 2L flask, add 10 grams of EDOT, and add 5 grams of emulsifier, stir, so that EDOT is completely emulsified and dispersed in water to form a transparent Uniform water dispersion, EDOT forms an oil-in-water emulsion in water, the particle size is less than 100nm, and the appearance is transparent. 100 mg of iron p-toluenesulfonate and 20 g of ammonium persulfate were prepared into 100 mL of aqueous solution, and slowly added dropwise to the reaction system. The reaction system gradually turns blue, keep the reaction temperature below 25 degrees, and react for 24 hours. After the reaction is completed, use the dialysis method, put it into a dialysis bag, repeatedly dilute the dialysis with pure water, and remove the residual unreacted monomer impurities and salt in the system by osmosis. Control the sodium ion concentration <50PPM...

Embodiment 2

[0052] Take 1000 mL of polystyrene sulfonic acid aqueous solution with a weight average molecular weight of 200,000 and a solid content of 2%, put it in a 2L flask, add 10 grams of EDOT, and add 5 grams of emulsifier, stir, so that EDOT is completely emulsified and dispersed in water to form Transparent and uniform water dispersion, EDOT forms an oil-in-water emulsion in water, the particle size is less than 100nm, and the appearance is transparent. 100 mg of iron p-toluenesulfonate and 20 g of ammonium persulfate were prepared into 100 mL of aqueous solution, and slowly added dropwise to the reaction system. The reaction system gradually turns blue, keep the reaction temperature below 25 degrees, and react for 24 hours. After the reaction is completed, use the dialysis method, put it into a dialysis bag, repeatedly dilute the dialysis with pure water, and remove the residual unreacted monomer impurities and salt in the system by osmosis. Control the sodium ion concentration ...

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Abstract

The invention discloses a preparation method of a PEDOT/PSS dispersion liquid. The preparation method of the PEDOT/PSS dispersion liquid comprises the following steps: preparing a first PSS dispersion liquid by adopting polystyrolsulfon acid with the weight-average molecular weight of 2000-50000, preparing a second PSS dispersion liquid by adopting polystyrolsulfon acid with the weight-average molecular weight of 50000-1000000, and uniformly mixing the first dispersion liquid with the second dispersion liquid, so that the PEDOT/PSS dispersion liquid is obtained. The PEDOT/PSS dispersion liquid has high conductivity, solid content of the obtained PEDOT/PSS dispersion liquid can be more than 4%, particle sizes of the PEDOT/PSS dispersion liquid are in bimodal distribution, two peaks are below 50 nanometers and more than 50 nanometers respectively, the solid content can be increased to more than 4%, concentration is high, and viscosity is low, so that the characteristics of good film forming property and high conductivity are realized, and the impregnation requirement of a high pressure solid capacitor can be met. The invention also discloses a preparation method of the high pressure solid capacitor by adopting the preparation method of the PEDOT/PSS dispersion liquid.

Description

technical field [0001] The invention relates to the field of manufacturing energy storage devices, in particular to a method for preparing a PEDOT / PSS dispersion and a method for preparing a high-voltage solid capacitor. Background technique [0002] Conductive polymer solid capacitors have excellent high-frequency and low-resistance characteristics, and are widely used in various applications. With the reduction of costs, there is a tendency to gradually replace the original liquid electrolytic capacitors. However, under its superior impedance characteristics and life characteristics, solid capacitors also have obvious disadvantages compared with traditional liquid electrolytic capacitors. Its main disadvantages are: the leakage current is large, usually the product leakage is in the range of 100μA-300μA, while the leakage of liquid capacitors is usually below 1μA, there is a big difference between the two; secondly, the withstand voltage is not high, and most of them can o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08L65/00C08L25/18C08G61/12H01G9/028H01G9/15
Inventor 陈宇澄徐永进罗旭芳
Owner STARZEON ELECTRONICS DONGGUAN
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