Graphene/active carbon composite material, preparation method thereof, and supercapacitor
A composite material, graphene technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of decreased electrode capacity, rising cost of supercapacitors, and difficulty in accurately grasping the dosage, and achieves high electrode capacity, high conductivity, and good conductivity.
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preparation example Construction
[0025] The flow chart of the preparation method of the composite material provided above is as follows figure 1 shown. refer to figure 1 , the method includes the steps of:
[0026] Step 110: Preliminary carbonization of the amorphous carbon material to obtain a preliminary carbonized product;
[0027] Step 120: preparing wrinkled graphene;
[0028] Step 130: fully mixing the preliminary carbonized product and the wrinkled graphene in the liquid phase, and then performing secondary carbonization on the mixture to obtain the final activated product;
[0029] Step 140: The final activated product is washed and pulverized to obtain the graphene / activated carbon composite material.
[0030] The graphene / activated carbon composite material provided above is used as an electrode material for a supercapacitor. The conductive component wrinkled graphene and the activated carbon material are not simply physically composited, but the conductive component wrinkled graphene and the ac...
no. 1 example
[0033] refer to figure 1 , Step 110: Preparing a preliminary carbonized product, that is, performing preliminary carbonization on the amorphous carbon material to obtain a preliminary carbonized product. Wherein, the amorphous carbon material includes at least one of biomass material, coal and petroleum products, but the present invention is not limited thereto. Specifically, in this example, 200 kg of coconut shells were carbonized at 580° C. for 2 hours, and crushed to an average particle size of 100 μm to 500 μm to obtain 120 kg of primary carbonized products.
[0034] Step 120: Preparation of wrinkled graphene. The specific steps include: first, pre-intercalate graphite microflakes with an intercalation agent, and obtain expanded graphene through cleavage and microwave treatment; wherein, the intercalation agent is FeCl 3 and H 2 SO 4 . The SEM image of the microstructure of the prepared expanded graphene is as follows: figure 2 shown. Then the expanded graphene is...
no. 2 example
[0043] In the description of the second embodiment, the similarities with the first embodiment will not be repeated here, and only the differences with the first embodiment will be described. The difference between the second embodiment and the first embodiment is that in step 130, the wrinkled graphene and the preliminary carbonized product are fully mixed and dispersed in a 10mol / L alkali solution under the condition that the mass ratio is 1:4, And secondary carbonization at 650° C. for 4 hours to obtain 140 kg of final activated product; through step 140, 138 kg of graphene / activated carbon composite material with an average particle size of about 5 μm was obtained.
[0044] The graphene / activated carbon composite material that prepares by described steps, after measuring, its specific surface area reaches 1900m 2 / g, the pore volume reaches 1.8cm 3 / g, the conductivity is 10 5 S / m.
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