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
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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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