A kind of carbon nanofiber membrane and its preparation and application in the cathode of lithium-air battery
A nano-carbon fiber, lithium-air battery technology, applied in battery electrodes, carbon preparation/purification, circuits, etc., can solve the problems of insufficient carbon powder space utilization, unreasonable pore size distribution, binder side reactions, etc., to avoid Electrode preparation process, ease of mass production, effect of high discharge plateau voltage
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Embodiment 1
[0030] Select polyacrylonitrile as the carbon source, dissolve a certain mass of polyacrylonitrile powder in N,N-dimethylformamide solution, wherein the mass fraction of polyacrylonitrile is 10%, stir at 70°C for 24h to fully Dissolved to obtain a clear and transparent solution. Then, 5 mL of the above solution was placed in a syringe, and spinning was carried out under the conditions of 10KV voltage, 25° C., and 10% relative humidity, and the distance between the needle tip of the syringe and the receiving plate was 5 cm. The obtained polymer fiber membrane was pre-oxidized in air at 300°C for 2h, then sintered at 1200°C for 2h under an argon atmosphere, and dried. Such as figure 1 The SEM image of the carbon nanofiber membrane material shown shows that it is made of interlaced carbon nanofibers, in which the diameter of the carbon nanofibers is about 200nm, and a rich macroporous structure is formed between the carbon fibers (the specific surface area is 200㎡.g -1 , with a...
Embodiment 2
[0032] Select polymethyl methacrylate as the carbon source, dissolve a certain mass of polymethyl methacrylate powder in N,N-dimethylformamide solution, wherein the mass fraction of polymethyl methacrylate is 15%, Stir at 50°C for 24h to fully dissolve to obtain a clear and transparent solution. Then, 10 mL of the above solution was placed in a syringe, and spinning was carried out under the conditions of 15KV voltage, 25° C., and a relative humidity of 20%, and the distance between the needle tip of the syringe and the receiving plate was 5 cm. The obtained polymer fiber membrane was pre-oxidized in air at 250°C for 2h, then sintered at 1000°C for 1h under argon atmosphere, and dried. The diameter of carbon nanofibers in the obtained carbon nanofiber membrane is about 100nm, and abundant macroporous structures are formed between carbon fibers (the specific surface area is 400㎡.g -1 , with a total pore volume of 0.8 cm 3 .g -1 ) figure 2 The lithium-air battery positive e...
Embodiment 3
[0034] Polylactic acid was selected as the carbon source, and a certain mass of polylactic acid powder was dissolved in anhydrous ethanolamine solution, wherein the mass fraction of polylactic acid was 20%, and stirred at 55°C for 12 hours to fully dissolve to obtain a clear and transparent solution. Then 15 mL of the above solution was placed in a syringe, and spinning was carried out under the conditions of 10KV voltage, 25° C., and a relative humidity of 15%, and the distance between the needle tip of the syringe and the receiving plate was 10 cm. The obtained polymer fiber membrane was pre-oxidized in air at 300°C for 3h, then sintered at 800°C for 2h under argon atmosphere, and dried. The diameter of carbon nanofibers in the obtained carbon nanofiber membrane is about 80nm, and abundant macroporous structures are formed between carbon fibers (the specific surface area is 500㎡.g -1 , with a total pore volume of 1.2 cm 3 .g -1 ).
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