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Tubular cathode preparing method for direct alcohol fuel battery

A fuel cell and tubular technology, which is applied to fuel cell parts, battery electrodes, circuits, etc., can solve the problems of unfavorable reaction by-products in the anode structure, the discharge of unfavorable reaction by-products, and the impact on battery performance stability. The effect of production cycle, light weight and high mechanical strength

Inactive Publication Date: 2008-08-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional direct alcohol fuel cells have the following disadvantages: 1) Graphite or metal bipolar plates account for a large proportion of the weight and cost of the entire fuel cell system, which cannot well meet the needs of small power sources such as laptops and mobile phones; 2) The structure of the anode is not conducive to the discharge of reaction by-products (such as carbon dioxide), and the structure of the cathode is not conducive to the discharge of reaction by-products (such as water), which affects the performance stability of the battery under long-term operation
However, the tubular titanium mesh used to make the cathode used in this paper is provided by the Heggemann company in Germany. Because of its high purity (>99.99%) and the use of laser welding technology, the cost is relatively high, so it is difficult to popularize.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 5g of acrylamide, 0.25g of N,N'-methylenebisacrylamide, and 0.5g of Tween in 94.25g of water, stir well to form a solution, and ensure that acrylamide and N,N'-methylenebisacrylamide are completely Dissolve to obtain a monomer solution; then weigh 60 g of the solution, add 40 g of mesophase pitch carbon microspheres with an average particle size ranging from 5 to 30 microns, and mix them uniformly by ball milling for 1 hour to obtain a stable slurry; then Add 0.2g ammonium persulfate and 0.1g N, N, N', N'-tetramethylethylenediamine to the slurry, mix it slightly with an electric mixer, and immediately inject the slurry into the mold of the formed tubular product. After 15 minutes at 60°C, the polymer monomers in the slurry form a gel network under the action of a crosslinking agent to obtain a tubular green body of mesophase pitch carbon microspheres; after demoulding the green body, put it in an air humidity of 85 % or more in a desiccator at room temperature ...

Embodiment 2

[0036] Dissolve 10g of acrylamide, 0.8g of N,N'-methylenebisacrylamide, and 0.5g of Tween in 98.7g of water, and stir to form a solution, ensuring that acrylamide and N,N'-methylenebisacrylamide are completely Dissolve to obtain a monomer solution; then weigh 40g of the solution, add 60g of mesophase pitch carbon microspheres with an average particle size range of 5-30 microns, and mix them uniformly by ball milling for 1 hour to obtain a stable slurry; then Add 0.1g ammonium persulfate and 0.05g N, N, N', N'-tetramethylethylenediamine to the slurry, mix it slightly with an electric mixer, and immediately inject the slurry into the mold of the formed tubular product. After 13 minutes at 70°C, the polymer monomer in the slurry forms a gel network under the action of the crosslinking agent to obtain a tubular green body of mesophase pitch carbon microspheres; % or more in a desiccator at room temperature until the volume of the green body is constant, then dried in air at 100°C ...

Embodiment 3

[0042] Dissolve 15g of acrylamide, 1.5g of N,N'-methylenebisacrylamide, and 4g of Tween in 79.5g of water, stir well to form a solution, and ensure that acrylamide and N,N'-methylenebisacrylamide are completely dissolved , to obtain a monomer solution; then weigh 20 g of the solution, add 80 g of mesophase pitch carbon microspheres with an average particle size range of 5-30 microns, and obtain a stable slurry after ball milling for 1 hour to obtain a stable slurry; Add 0.05g ammonium persulfate and 0.02g N, N, N', N'-tetramethylethylenediamine to the slurry, mix it slightly with an electric mixer, and immediately inject the slurry into the mold of the formed tubular product, at 80 After 10 minutes at ℃, the polymer monomer in the slurry forms a gel network under the action of the cross-linking agent, and obtains the mesophase pitch carbon microsphere tubular green; The above desiccator is kept at room temperature until the volume of the green body becomes constant, and then d...

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Abstract

The invention provides a method for preparing a tube-shaped cathode of a direct methanol fuel cell, belonging to the fuel cell field and comprising the steps of: dispensing a single solution for gel injection molding at first, then adding a mesophase bituminous coal micro ball into the single solution and stirring evenly to obtain stable slurry, then casting the slurry into a die, preserving heat until the single solution reacts with a cross-linker completely to obtain a carbon-biscuit, after drying and sintering the biscuit in vacuum, preparing a diffusion layer and a catalyst layer on the surface by dipping process, and then coating polyester electrolyte membrane with a burette, rolling the carbon on a warm table to solidify the electrolyte membrane. According to the steps, the tube-shaped cathode of a direct methanol fuel cell can be obtained. The tube-shaped cathode of a direct methanol fuel cell made by the method has the characteristic of high mechanical strength, light weight, good conductive performance and thermal conductivity, no hazardous and pollution to a proton exchange membrane fuel cell in long running and low price, can replace an expensive tube-shaped Ti-mesh cathode.

Description

technical field [0001] The invention relates to a preparation method in the technical field of fuel cells, in particular to a preparation method for a tubular cathode for a direct alcohol fuel cell. Background technique [0002] Methanol, ethanol, and propanol can be used as fuels for direct alcohol fuel cells. Among them, direct methanol fuel cells and direct ethanol fuel cells are widely used in methanol or ethanol, low in price, high in energy utilization efficiency, and environmentally friendly. Operating mode, operability at room temperature and easy to carry, etc., thus becoming a leader in new fuel cells, and has broad application prospects in military, transportation, electronic communication and other fields. Traditional direct alcohol fuel cells are mainly composed of bipolar plates (mainly made of graphite or metal), catalytic-diffusion layer and polymer electrolyte membrane. The membrane system is formed into a "three-in-one" membrane electrode system by hot pre...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M8/02H01M8/0289
CPCY02E60/50
Inventor 李飞倪红军何博周洪孙宝德
Owner SHANGHAI JIAO TONG UNIV
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