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Air electrode and preparation method and application thereof

An air electrode and gas diffusion technology, applied in battery electrodes, circuits, fuel cell half-cells and secondary battery-type half-cells, etc., can solve the problem of reducing the service life and electrical performance of air electrodes and the size of air electrode holes Inhomogeneity, uneven particle size distribution, etc., to achieve the effects of slowing down the polarization of the air battery, uniform pore size, and uniform distribution

Active Publication Date: 2020-03-17
蔚蓝(广东)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, because the decomposition temperature of inorganic salt and metal powder is too high, and the preparation temperature is not enough to completely decompose it, resulting in inorganic salt and metal powder remaining in the air electrode so that the porosity of the air electrode is not high; on the other hand, due to inorganic The uneven particle size distribution of the salt and metal powder makes the pore size and distribution of the prepared air electrode different, so that the reaction gas cannot enter the catalytic layer and a good gas-liquid-solid three-phase electrochemical reaction cannot occur, hindering The diffusion of the reaction gas in the catalytic layer is aggravated, and the polarization of the air battery is aggravated, thereby reducing the electrode life and electrical performance of the air electrode.

Method used

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  • Air electrode and preparation method and application thereof

Examples

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Effect test

preparation example Construction

[0038] The preparation method of the air electrode 100 of the present invention, the steps include:

[0039] 1) Weigh C powder, industrial alcohol and PTFE emulsion according to a certain mass ratio, mix C powder and industrial alcohol and stir evenly, then add PTFE emulsion to it, stir evenly, and obtain gas diffusion slurry;

[0040] 2) Put the gas diffusion slurry into the hydraulic mold containing the current collector 2, and press the mold to obtain the current collector 2 filled with the gas diffusion slurry on one side, which is dried and rolled, and the gas diffusion slurry forms a gas diffusion membrane;

[0041] 3) Weigh C powder, industrial alcohol, catalyst, pore-forming agent and PTFE emulsion according to a certain mass ratio, mix C powder, industrial alcohol, catalyst, and pore-forming agent and stir evenly, then add PTFE emulsion to it, and stir evenly , to obtain a catalytic slurry, wherein the pore-forming agent is selected from any one of ammonium oxalate, ...

Embodiment 1

[0046] A method for preparing an air electrode, comprising the steps of:

[0047] 1) Weigh 20g of C powder, 300g of industrial alcohol and 60g of PTFE emulsion, mix C powder and industrial alcohol and stir for 5min at a stirring speed of 1500r / min, then add PTFE emulsion and stir for 20min at a stirring speed of 4000r / min to obtain a gas diffusion slurry;

[0048] 2) Put 160g of gas diffusion slurry into a hydraulic mold with 20cm×20cm foamed nickel on the bottom, set the pressure at 20MPa, and press the mold for 3min to obtain foamed nickel filled with gas diffusion slurry on one side, and place it at 80 Dry in a drying oven at ℃ for half an hour, and then roll the gas diffusion slurry to form a gas diffusion film with a thickness of 0.7mm;

[0049] 3) Weigh 20g C powder, 200g industrial alcohol, 20g catalyst, 20g polyvinyl alcohol (PVA) and 16g PTFE emulsion, mix C powder, industrial alcohol, catalyst, polyvinyl alcohol (PVA) and stir at a stirring speed of 1500r / min 5min,...

Embodiment 2

[0054] A method for preparing an air electrode, comprising the steps of:

[0055] 1) Weigh 20g of C powder, 200g of industrial alcohol and 40g of PTFE emulsion, mix C powder and industrial alcohol and stir at a stirring speed of 1500r / min for 5min, then add PTFE emulsion and stir for 20min at a stirring speed of 4000r / min to obtain a gas diffusion slurry;

[0056] Subsequent preparation methods are the same as step 2), step 3), step 4), and step 5) in Example 1, so no detailed description is given here.

[0057] The charge-discharge cycle life test was carried out on the air electrode prepared in this embodiment, and the result was that the electrode life of the air electrode was greater than 275 hours.

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Abstract

The invention provides a preparation method of an air electrode. The preparation method comprises the following steps of 1) preparing a gas diffusion slurry from C powder, industrial alcohol and PTFEemulsion; 2) enabling the gas diffusion slurry to form a gas diffusion film at one side of a current collector; 3) preparing the catalytic slurry from the C powder, industrial alcohol, a catalyst, a pore-forming agent and PTFE emulsion, wherein the pore-forming agent is selected from any one of ammonium oxalate, ammonium bicarbonate, polyethylene glycol 200 and polyvinyl alcohol; 4) forming a catalytic membrane from the catalytic slurry at the other side of the current collector; and 5) sintering the current collector of which the two sides are respectively provided with the gas diffusion filmand the catalytic film to prepare the air electrode which has the relatively higher porosity, relatively longer electrode service life and relatively more excellent electrical property. In addition,the invention also provides the air electrode prepared by the preparation method of the air electrode and the application of the air electrode in the field of membrane electrodes.

Description

technical field [0001] The invention relates to the technical field of air electrode preparation, in particular to a method for preparing an air electrode. Background technique [0002] The air electrode is a kind of gas diffusion electrode, which has been widely studied because of its energy saving and environmental protection characteristics and its application in energy batteries. The air electrode usually includes a gas diffusion layer, a current collector, and a catalytic layer. The reaction gas enters the catalytic layer through the gas diffusion layer to undergo a gas-liquid-solid three-phase electrochemical reaction, and the electron gain and loss transfer process is completed through the current collector. In order to improve the electrode life and electrical performance of air electrodes, efforts have been made to improve the preparation methods of air electrodes. In the prior art, in the preparation process of the air electrode, the pore structure of the catalyti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M12/08
CPCH01M4/8605H01M4/8807H01M4/886H01M4/8885H01M12/08Y02E60/10
Inventor 窦树楠席煜宸陈冬芬
Owner 蔚蓝(广东)新能源科技有限公司
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