Zinc-air battery positive electrode and positive electrode powder dry preparation process and zinc-air battery
A technology of zinc-air battery and preparation process, which is applied in the direction of battery electrodes, fuel cell half-cells, primary battery-type half-cells, portable system fuel cells, etc., and can solve the impact of material performance, side reactions, complex costs, etc. Problems, to achieve excellent performance, simple production process, high film strength
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Embodiment 1
[0063] Cathode materials include binder polytetrafluoroethylene, catalyst MnO 2 , activated carbon, graphite. PTFE powder 2kg, MnO 2 3kg, 4kg of activated carbon and 1kg of graphite are mixed and granulated in a high-speed stirring tank to obtain positive electrode powder. The average particle size of PTFE powder is 450μm.
[0064] Figure 4 The SEM image of the mixed powder after dry mixing and granulation of Example 1 is shown. It can be observed from the figure that the positive electrode mixture powder is evenly mixed after one-step forming dry mixing, and a large amount of binder fibrosis appears in the powder. Then pass the positive electrode powder through a horizontal double-roll machine to form a catalyst sheet with uniform thickness, regular surface and high strength, and then pass the catalyst sheet through a vertical double-roll machine to press nickel mesh and PTFE film on both sides to obtain the required positive electrode. piece. The positive electrode sh...
Embodiment 2
[0067] Cathode materials include binder polytetrafluoroethylene, catalyst MnO 2 , activated carbon, graphite. PTFE powder 1kg, MnO 2 2 kg, 3 kg of activated carbon, and 0.5 kg of conductive carbon were mixed and granulated in a high-speed stirring tank to obtain positive electrode powder, and the rest of the preparation process was the same as in Example 1.
[0068] SEM detection was also carried out on the mixed powder of Example 2, and it was also found that a large amount of binder fibrosis appeared in the powder.
Embodiment 3
[0070] Cathode materials include binder polytetrafluoroethylene, catalyst MnO 2 , activated carbon, graphite. The steps of dry preparation of the positive electrode sheet are as follows: 3 kg of PTFE powder, 5 kg of MnO2, 5 kg of activated carbon and 1.2 kg of conductive carbon are mixed and granulated in a high-speed stirring tank to obtain the positive electrode powder. The rest of the preparation process is the same as in Example 1.
[0071] SEM detection was also carried out on the mixed powder of Example 3, and it was also found that a large amount of binder fibrosis appeared in the powder.
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