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Gas diffusion electrode of zinc-air battery and preparation method for gas diffusion electrode

A technology of gas diffusion electrodes and zinc-air batteries, which is applied to fuel cell half-cells and primary battery-type half-cells, can solve the problems of low gas permeability of polymer membranes, increase the separation coefficient, reduce the limiting current, Effect of Utilization Ratio Improvement

Inactive Publication Date: 2012-07-04
SHANGHAI YAOYU INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the low air permeability of general polymer membranes, and zinc-air batteries need sufficient gas flow to ensure normal operation, it is difficult for general polymer membranes to meet this requirement.
So far, there are few domestic and foreign research reports on coating polymer membranes on air diffusion electrodes to improve their exchange capacity with the environment.

Method used

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  • Gas diffusion electrode of zinc-air battery and preparation method for gas diffusion electrode
  • Gas diffusion electrode of zinc-air battery and preparation method for gas diffusion electrode
  • Gas diffusion electrode of zinc-air battery and preparation method for gas diffusion electrode

Examples

Experimental program
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Effect test

preparation example Construction

[0042] Preparation of AA-type zinc-air battery samples and determination of their discharge performance

[0043] The AA-type zinc-air battery sample adopts an external oxygen cylindrical structure, uses paste zinc paste as the negative electrode, and the diaphragm material is polypropylene non-woven fabric. The air diffusion electrode obtained by the invention is assembled into an AA-type zinc-air battery. The BS-9300 battery performance tester produced by Guangzhou Electrical Apparatus Research Institute was used to test the constant current discharge performance of AA zinc-air batteries. The discharge current of the zinc-air battery is 50mA, and the end-of-discharge voltage is 0.9V.

Embodiment 1

[0049] Air Diffusion Electrode (Uncoated Polymer)

[0050]Activated carbon, polytetrafluoroethylene emulsion (solid content is 60%), anhydrous sodium sulfate and Co-PPy-C composite catalyst (mass ratio is 4.5~7.5: 1~2.5: 1: 1~5, in this example 5: 1: 1: 3 was selected in .) mixing, with ethanol as dispersant, heated and stirred to a paste and rolled into a catalytic layer; acetylene black, polytetrafluoroethylene emulsion, anhydrous sodium sulfate (mass ratio of 7~12: 4~11: 1~4, selected 10: 5: 2 in the present embodiment.) mixing, with ethanol as dispersant, after heating and stirring until pasty, roll into a waterproof breathable layer; The waterproof and air-permeable layer, the current collector and the catalytic layer are laminated in the order of outside to inside, and then roll-formed, and dried at 70° C. for 30 minutes to obtain the air diffusion electrode 1 .

[0051] The above-mentioned Co-PPy-C composite catalyst is prepared by the following method: After mixing an...

Embodiment 2

[0054] Take 3 milliliters of 20% tetrafluoroethylene / hexafluoropropylene copolymer solution, directly apply it on the air-permeable side of the air-diffusion electrode 1, and dry it in the air for several hours to obtain the air-diffusion electrode 2.

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Abstract

The invention relates to a gas diffusion electrode of a zinc-air battery and a preparation method for the gas diffusion electrode of the zinc-air battery. The electrode comprises a middle current collector, a waterproof ventilating layer and a catalytic layer, wherein the waterproof ventilating layer is pressed and coated at the both sides of the current collector. The catalyst adopted by the catalytic layer is Co-PPy-C composite. One side of the waterproof ventilating layer, which is close to air, is coated with a polymer layer. According to the gas diffusion electrode of the zinc-air battery, the limiting current and the water absorbing speed are reduced, and the separation coefficient of oxygen and vapor is increased. For an AA type zinc-air battery assembled by the gas diffusion electrode of the zinc-air battery, the discharge capacity of the battery is greatly improved in dry and humid environments, and the utilization rate of the zinc electrode is obviously improved.

Description

[0001] technical field [0002] The invention relates to the field of zinc-air batteries, in particular to a gas diffusion electrode for a zinc-air battery and a preparation method thereof. Background technique [0003] Zinc-air batteries have the advantages of high energy, high density, good specific capacity, and safe use. The oxygen reduction reaction on the positive electrode has a high overpotential and slow kinetics. At present, platinum and platinum-based catalysts supported by carbon are mainly used. However, the cost of platinum metal is high, and resources are scarce in the world, so it is difficult to popularize and apply it. [0004] Zinc-air batteries are not a closed system, and their electrical properties are easily affected by ambient humidity. When the external humidity is high, the electrolyte is prone to moisture absorption and leakage; when the external humidity is low, the electrolyte is easy to evaporate, causing the battery to dry up and fail. [0005]...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/90H01M4/88H01M12/06
CPCY02E60/50Y02E60/128
Inventor 不公告发明人
Owner SHANGHAI YAOYU INDAL
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