A metal-air battery cathode material and its preparation method and metal-air battery
A metal-air battery and cathode material technology, which is applied to battery electrodes, fuel cell half-cells, primary battery half-cells, circuits, etc., can solve the problems of poor stability and low power density of air batteries, and achieve improved performance, improved power density and usage stability, and the effects of efficient current collection
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[0070] The present invention provides a method for preparing a metal-air battery cathode material described in the above technical solution, comprising the following steps:
[0071] a), the bottom layer and the core layer are pressed together, and the catalyst slurry is used to form a film on the surface of the core layer before or after the pressing, so as to obtain the metal-air battery cathode material;
[0072] The bottom layer comprises metal foam and a hydrophobic material;
[0073] The core layer includes metal foam and a hydrophobic material;
[0074] The core layer has a greater porosity and / or pore size than the bottom layer;
[0075] The catalyst slurry includes a porous carbon material, a hydrophobic material, a catalyst and a solvent.
[0076] In the preparation method of the metal-air battery cathode material provided by the present invention, the bottom layer and the core layer are pressed together, and the catalyst slurry is used to form a film on the surface...
Embodiment 1
[0112] 1) Preparation of bottom layer:
[0113] Select foamed nickel with a thickness of 1.5 mm, a pore size of 300 μm, a porosity of 70%, and a mass of 0.46 g, and impregnate it in 20 wt % polytetrafluoroethylene emulsion (Shanghai 3F Company). The metal foam impregnated with polytetrafluoroethylene was taken out, dried at 80°C for 5 hours, and then sintered at 350°C for 1 hour to obtain the bottom layer.
[0114] SEM observations were carried out on the non-impregnated nickel foam and the prepared core layer respectively, the results are as follows figure 1 and figure 2 shown. figure 1 The scanning electron micrograph of the nickel foam provided by the embodiment of the present invention 1; figure 2 The scanning electron microscope image of the bottom layer provided by Example 1 of the present invention. pass figure 1 and figure 2 It can be seen from the comparison that the polytetrafluoroethylene in the bottom layer provided by this embodiment has been compounded o...
Embodiment 2
[0126] 1) Preparation of bottom layer:
[0127] Select foamed nickel with a thickness of 1.5 mm, a pore size of 300 μm, a porosity of 70%, and a mass of 0.46 g, and impregnate it in 40 wt % polytetrafluoroethylene emulsion (Shanghai 3F Company). The metal foam impregnated with polytetrafluoroethylene was taken out, dried at 80°C for 5 hours, and then sintered at 350°C for 1 hour to obtain the bottom layer.
[0128] The porosity and pore diameter of the bottom layer prepared above were measured, and the results showed that the porosity was 30% and the pore diameter was 120 μm.
[0129] 2) Preparation of the core layer:
[0130] Select 0.35g nickel foam with a thickness of 1.5mm, an average pore diameter of 500μm, and a porosity of 97%, and impregnate it in 20wt% polytetrafluoroethylene emulsion (Shanghai 3F Company). The metal foam impregnated with polytetrafluoroethylene was taken out, dried at 80° C. for 5 hours, and then sintered at 350° C. for 1 hour to obtain the core la...
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Abstract
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