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Separator for fuel cell and preparation method of separator

A fuel cell and diaphragm technology, applied in the field of fuel cell diaphragm and its preparation, can solve the problems that hinder the commercial application of quaternary ammonium salt type polymer anion exchange membrane alkaline fuel cells, thermal stability, chemical stability and strength resistance Poor alkali performance, environmental protection and human health hazards, etc., to achieve the effects of alkali resistance and chemical stability, improve methanol penetration resistance, and facilitate large-scale production

Active Publication Date: 2016-08-31
先进储能材料国家工程研究中心有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Anion-exchange membrane is a diaphragm used in anion-exchange membrane fuel cells. It is a type of diaphragm for fuel cells that researchers have paid extensive attention to. The traditional anion-exchange membrane is a quaternary ammonium salt-type polymer anion-exchange membrane. This anion-exchange membrane Thermal stability, chemical stability and strong alkali resistance are poor. In addition, the highly toxic and carcinogenic chloromethyl ether, which is harmful to environmental protection and human health, is often used in the preparation process.
These defects hinder the commercial application of quaternary ammonium salt-based polymer anion-exchange membrane alkaline fuel cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a diaphragm for a fuel cell, comprising the following steps:

[0029] ⅠDissolve 10g of 2-vinyl-4,6-diamino-1,3,5-triazine and 110g of 1-bromoadamantane in 600g of acetonitrile, then add 60g of potassium hydroxide to it, and nitrogen at room temperature Stirred under the atmosphere for 4 hours; then rotary evaporated in vacuum, the crude product obtained by filtration was extracted 3 times with dichloromethane, then the organic phase was washed with deionized water, finally dewatered with anhydrous magnesium sulfate, filtered, rotary evaporated, and Bake in vacuum at 30°C for 12 hours to obtain a polymeric ionic liquid;

[0030] II Weigh 10g of titanium dioxide with a particle size of 10nm in a round bottom flask, add 30g of acetonitrile and 20g of vinyltriethoxysilane, and disperse evenly by ultrasonication, then add dropwise 10mL of titanium dioxide with a mass fraction of 25% under a mechanical stirring condition of 1000r / min. Ammonia, mix even...

Embodiment 2

[0034] A method for preparing a diaphragm for a fuel cell, comprising the following steps:

[0035] ⅠDissolve 10g of 2-vinyl-4,6-diamino-1,3,5-triazine and 110g of 1-bromoadamantane in 500g of dichloromethane, and then add 60g of K 2 CO 3 , and stirred at room temperature under an argon atmosphere for 5 hours, then rotary evaporated under vacuum, filtered the crude product obtained and extracted 4 times with ether, then washed the organic phase with deionized water, and finally dehydrated with anhydrous magnesium sulfate, filtered, and spun steamed, and baked in vacuum at 35°C for 15 hours to obtain a polymeric ionic liquid;

[0036] ⅡWeigh 10g of titanium dioxide with a particle size of 15nm in a round bottom flask, add 40g of dichloromethane and 25g of vinyltriethoxysilane, ultrasonically disperse evenly, and then add dropwise 8mL of titanium dioxide with a mass fraction of 28 % ammonia water, mixed evenly, after stirring for 1 hour, the rotating speed was adjusted to 60r / ...

Embodiment 3

[0040] A method for preparing a diaphragm for a fuel cell, comprising the following steps:

[0041]ⅠDissolve 10g of 2-vinyl-4,6-diamino-1,3,5-triazine and 110g of 1-bromoadamantane in 550g of acetonitrile, then add 60g of cesium carbonate, and heat Stirred under air atmosphere for 6 hours, then rotary evaporated under vacuum, the crude product obtained by filtration was extracted 5 times with ethyl acetate, then the organic phase was washed with deionized water, finally dehydrated with anhydrous magnesium sulfate, filtered, rotary evaporated, and Bake in vacuum at 36°C for 18 hours to obtain a polymeric ionic liquid;

[0042] II Weigh 10g of titanium dioxide with a particle size of 20nm in a round bottom flask, add 45g of acetonitrile and 26g of vinyltriethoxysilane, and disperse evenly by ultrasonication, then add dropwise 7mL of titanium dioxide with a mass fraction of 27% under the condition of mechanical stirring at 1000r / min. Ammonia water, mixed evenly, after stirring f...

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Abstract

The invention provides a preparation method of a separator for a fuel cell. The preparation method comprises the following steps of firstly, preparing a polymerized ion liquid and double-bond modified nanometer titanium dioxide, mixing and dropping the polymerized ion liquid, the double-bond modified nanometer titanium dioxide, a monomer containing a polymerizable group and an emulsifier onto a surface plate, placing the mixture in a radiation field with an inert gas atmosphere, radiating the mixture for 35-45 minutes by a cobalt 60-Gamma radiation method, immersing the product in a 0.5-1.0mol / L alkali liquid with a temperature of 50-60 DEG C for 54-72 hours, washing the product with water to be neutral, and carrying out vacuum drying to prepare a separator finished product. According to the method, adamantine is used as an electron supply group, and the alkali resistance and the chemical stability of the triazine ion liquid are promoted; and the double-bond modified titanium dioxide is taken as a cross-linking agent, and thus, the alkali resistance, the mechanical property, the water absorption performance, the methanol-preventing permeability and the chemical stability of the separator are improved on the premise of ensuring relatively high ionic conductivity.

Description

technical field [0001] The invention relates to a diaphragm and a preparation method thereof, in particular to a diaphragm for a fuel cell and a preparation method thereof. Background technique [0002] A fuel cell is an electrochemical device in which the electrodes accept the supply of fuel and directly convert the chemical energy of the fuel into electrical energy. It has the advantages of high energy conversion efficiency, fast start-up speed, low operating noise, no electrolyte leakage, and low corrosion. It has broad market demand and good application value in the fields of vehicle power energy, portable electronic products and distributed power stations. The diaphragm is one of the key components of the fuel cell, which plays a dual role of transferring ions and blocking raw materials in the fuel cell. Its performance directly affects the service life of the fuel cell. An ideal fuel cell membrane should have high ionic conductivity, good thermal stability, chemical ...

Claims

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Application Information

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IPC IPC(8): H01M8/0226
CPCH01M8/0226Y02E60/50
Inventor 钟发平张洪涛欧腾蛟万年坊
Owner 先进储能材料国家工程研究中心有限责任公司
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