Spinning solution for fuel cell and preparation method of carbon paper of spinning solution

A fuel cell and spinning solution technology, which is applied in the fields of fuel cells, battery electrodes, rayon manufacturing, etc., can solve the problems of high consistency requirements, difficult to disperse evenly, affecting mass transfer, etc., and achieve a simple and controllable preparation process. , cost reduction, good air permeability

Pending Publication Date: 2021-11-23

中汽创智科技有限公司

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AI-Extracted Technical Summary

Problems solved by technology

Although the wet papermaking process is relatively mature, the carbon content of carbon fiber is very high, the surface is inert, it is difficult to disperse evenly, and the consistency of forming is very high. The thickness tolerance of paper is relatively large, generally exceeding ...

Method used

As shown in Figure 1, by measuring the thickness of 5 test points of carbon paper, the thickness consistency of the embodiment of the present invention 1-6 is more excellent, tolerance is less than 5 microns, and the thickness tolerance of commercial carbon paper comparative example 2 Very large, more than 10 microns.

In summary, the plasticizer used in the present invention improves the violent exothermic when polyacrylonitrile is oxidized, reduces the fracture of polyacrylonitrile molecule, reduces the formation of macropore defect, improves the stability of spinning process, Improve the quality of carbon fiber. In addition, the plasticizer can improve the gel phenomenon of the spinning solution, improve the spinnability, and promote the intramolecular cyclization of polyacrylonitrile during oxidation. In addition, solvents increase the solubility of polyacrylonitrile and improve rheological properties. The invention improves the ring-forming control of the polyacrylonitrile, the stability of the oxidation process, the structural uniformity of the carbon fiber, and the stability of the porous structure of the final carbon paper. At the same time, controlling the injection temperature and hum...

Abstract

The invention discloses a spinning solution for a fuel cell and a preparation method of carbon paper of the spinning solution, and belongs to the technical field of carbon paper preparation. The spinning solution comprises raw materials, a solvent and an auxiliary; the mass ratio of the raw material to the solvent to the auxiliary agent is (20-50): (60-100): (1-5); the raw material comprises polyacrylonitrile; the solvent comprises one or more of dimethyl amide, dimethyl sulfoxide, sodium thiocyanate or zinc chloride; and the auxiliary agent comprises one or more of dimethyl phthalate, diethyl phthalate, di-n-butyl phthalate, dioctyl phthalate or butyl benzyl phthalate. The spinning liquid is jetted on a substrate by jet spinning to form organic cellosilk firstly and then form the carbon fiber paper. The carbon fiber paper with good thickness consistency prepared by the method has good capability of conducting electrons, water and gas, in addition, the preparation process is simple and controllable, the cost is reduced, and batch production can be realized.

Application Domain

Cell electrodesFinal product manufacture +4

Technology Topic

Butylbenzyl phthalateThiocyanic acid +15

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Examples

Experimental program(6)
Comparison scheme(2)

Example Embodiment

[0035] Example 1

[0036] Preparation of carbon paper for fuel cells specifically comprises the following steps:

[0037] Step 1, adding 20% polyacrylonitrile, 72% dimethylformamide and dimethyl sulfoxide, 5% dimethyl phthalate and diethyl phthalate to prepare spinning liquid;

[0038] Step 2: Place the steel sheet base 4 in the injection chamber, and set the internal environment of the injection chamber 5: the injection temperature is 50°C, and the injection humidity is 30%; controlling the injection temperature and humidity is conducive to solvent volatilization, fiber formation, and carbon Stable formation of paper porous structure.

[0039] Step 3, the spinning liquid is sprayed from the spinneret 3 through the pressure pump 1 and the meter 2, and sprayed on the steel sheet to form a carbon fiber paper precursor; the discharge rate of the meter is set to 15ml/min. Select the "m"-shaped stroke of the spraying stroke, set the number of spraying layers to 10, and start spraying.

[0040] The pressure pump is selected from the ConST100 series, and the meter is selected from the KD series.

[0041] Step 4: The carbon fiber paper precursor is sequentially subjected to rolling, low-temperature oxidation at 300° C., and high-temperature carbonization at 800° C. to obtain carbon fiber paper.

[0042] The carbon fiber paper prepared in this example was tested, and its microstructure was 10 fiber layers, and each fiber layer was interlaced fiber filaments. The diameter of the fiber filaments is between 5-10um, the pores are increased when stacked or interlaced, and the ability to conduct electrons, water and gas is improved. To test its thickness, the test equipment is a digital thickness gauge, the principle is ultrasonic testing, and the porosity is tested by a porosity analyzer. The thickness, porosity, air permeability, surface resistance, vertical resistance and tensile strength of the carbon fiber paper prepared in this example are shown in Table 1 and Table 2.

Example Embodiment

[0043] Example 2

[0044] Preparation of carbon paper for fuel cells specifically comprises the following steps:

[0045]Step 1, add 25% polyacrylonitrile, 80% sulfolane, ethylene nitrate, sodium thiocyanate, 3% di-n-butyl phthalate, dioctyl phthalate to prepare spinning liquid;

[0046] Step 2. Place a copper sheet in the injection chamber and set the internal environment of the injection chamber: the injection temperature is 60°C, and the injection humidity is 60%; controlling the injection temperature and humidity is conducive to solvent volatilization, fiber formation, and carbon paper porous structure stable formation.

[0047] Step 3, the spinning liquid is sprayed from the spinneret through a pressure pump and a meter, and sprayed on the copper sheet to form a carbon fiber paper precursor; the discharge rate of the meter is set to 10ml/min. Select the "m"-shaped stroke of the spraying stroke, set the number of spraying layers to 15, and start spraying.

[0048] The pressure pump is selected from the ConST100 series, and the meter is selected from the KD series.

[0049] Step 4: The carbon fiber paper precursor is sequentially subjected to rolling, low-temperature oxidation at 250° C., and high-temperature carbonization at 1200° C. to obtain carbon fiber paper.

[0050] The thickness, porosity, air permeability, surface resistance, vertical resistance and tensile strength of the carbon fiber paper prepared in this example are shown in Table 1 and Table 2.

Example Embodiment

[0051] Example 3

[0052] Preparation of carbon paper for fuel cells specifically comprises the following steps:

[0053] Step 1, add 40% polyacrylonitrile, 84% sulfolane, ethylene nitrate, sodium thiocyanate, 6% dimethyl phthalate, butyl benzyl phthalate to prepare spinning liquid ;

[0054] Step 2. Place an iron sheet in the injection chamber and set the internal environment of the injection chamber: the injection temperature is 40°C, and the injection humidity is 40%; controlling the injection temperature and humidity is conducive to solvent volatilization, fiber formation, and carbon paper porous structure stable formation.

[0055] Step 3, the spinning liquid is sprayed from the spinneret through a pressure pump and a meter, and sprayed on the iron sheet to form a carbon fiber paper precursor; the discharge rate of the meter is set to 8ml/min.

[0056] Select the "m"-shaped stroke of the spraying stroke, set the number of spraying layers to 11, and start spraying.

[0057] The pressure pump is selected from the ConST100 series, and the meter is selected from the KD series.

[0058] Step 4: The carbon fiber paper precursor is sequentially subjected to rolling, low-temperature oxidation at 320° C., and high-temperature carbonization at 900° C. to obtain carbon fiber paper.

[0059] The thickness, porosity, air permeability, surface resistance, vertical resistance and tensile strength of the carbon fiber paper prepared in this example are shown in Table 1 and Table 2.

PUM

Property	Measurement	Unit
Diameter	5.0 ~ 10.0	µm
Thickness	40.0	µm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Good air permeability
lower resistance

Spinning solution for fuel cell and preparation method of carbon paper of spinning solution

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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