Carbon/carbon composite material based on nano graphite sheet and preparation method thereof
A technology of nano-graphite sheets and carbon composite materials, which is applied in the field of nano-materials, can solve problems such as easy aggregation, low specific surface area, and large specific surface energy of nano-graphite sheets, so as to achieve improved specific surface area, high specific surface area, and low internal resistance. Effect
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Embodiment 1
[0030] Mix expanded graphite with an expansion rate of 200, polystyrene and solvent benzene in a ratio of 1:1:50, and prepare a dispersion of nano-graphite flakes by ultrasonication for 2 hours, and then use ethanol with a solvent weight ratio of 10:1 as a precipitate Precipitate the uniformly dispersed nano-graphite flakes and polystyrene, and prepare nano-graphite / polymer composite powder after fully washing and drying. It was pre-oxidized in air at 200°C for 0.5h and then carbonized at 500°C for 0.5h under the protection of nitrogen atmosphere at a heating rate of 5°C / min. Then, follow the ZnCl 2 The weight ratio of 1:0.1 is added to a concentration of 10wt% ZnCl 2 In the solution, mix well and soak at room temperature for 4 hours, heat at 120°C for 4 hours and dry, then raise the temperature to 600°C at a rate of 5°C / min to activate for 0.5h under the protection of nitrogen atmosphere, and then fully wash with water and dry after cooling to room temperature. Obtain the r...
Embodiment 2
[0032] The expanded graphite that expansion ratio is 300 is mixed with polyethylene and dispersant BYK-250 (produced by German BYK company) and solvent benzene in the ratio of 1: 20: 5: 100, by ball milling 50h, prepares nano-graphite dispersion liquid, then Use propanol with a solvent weight ratio of 20:1 as a precipitant to precipitate the uniformly dispersed nano-graphite flakes and polyethylene, and prepare the nano-graphite flakes / polymer composite powder after fully washing and drying. It was pre-oxidized in air at 300°C for 3h, and then carbonized at 1000°C for 5h under the protection of argon atmosphere at a heating rate of 30°C / min. Then, add it into the KOH solution with a concentration of 20wt% according to the ratio of 1:0.5 by weight to KOH, mix well and soak at room temperature for 24 hours, heat at 150°C for 8 hours and dry it, and then use it under the protection of argon atmosphere at a rate of 30°C / min. The heating rate was raised to 1000°C for 3 hours of act...
Embodiment 3
[0034]200 mesh natural graphite is mixed with polypropylene and dispersant BYK-161 (produced by German BYK company) and solvent benzene in a ratio of 1: 10: 10: 100, and prepared by ball milling for 30 h to prepare nano-graphite sheet dispersion, and then use it with solvent Ethanol with a weight ratio of 15:1 is used as a precipitating agent to precipitate the uniformly dispersed graphite nano flakes and polypropylene, and after fully washing and drying, the graphite nano flakes / polymer composite powder is prepared. It was pre-oxidized in air at 250 °C for 2 h, and then carbonized at 600 °C for 1 h under the protection of nitrogen atmosphere at a heating rate of 15 °C / min. Then, add it into the KOH solution with a concentration of 20wt% according to the weight ratio of 1:0.2 to NaOH, mix well and soak at room temperature for 10 hours, heat at 130°C for 6 hours and dry it, then use a nitrogen atmosphere protection at 20°C / min The heating rate was raised to 700°C for 2 hours of...
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