A kind of graphene/carbon composite material for supercapacitor and preparation method thereof
A technology of carbon composite materials and supercapacitors, applied in the direction of graphene, carbon preparation/purification, chemical instruments and methods, etc., to achieve long cycle life, low cost, and improved energy storage effects
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[0025] The preparation method of graphene / carbon composite material for supercapacitor of the present invention comprises the following steps:
[0026] Step 1. Add a mixture of tar pitch and semi-coke in a certain mass ratio (1:1-1:10) into a mortar, grind and mix evenly. Subsequently, a certain amount of directing agent and potassium hydroxide are respectively added to the above mixture, and mixed well, and the directing agent is one of magnesium oxide, magnesium hydroxide, and magnesium carbonate. The mass ratio of the mixture of tar pitch and semi-coke to the directing agent is 1:1-1:10, and the mass ratio of the mixture of tar pitch and semi-coke to potassium hydroxide is 1:1-1:5.
[0027] Step 2, transfer the mixture in step 1 to an inert atmosphere high-temperature tube furnace, keep it at 120°C-250°C for 0.5-1 hour, then heat it to 600°C-900°C and keep it for 0.5-3 hours, the heating rate is 2-10°C / min, naturally cool to room temperature, and the inert atmosphere is on...
Embodiment 1
[0031] (1) Add 3g of tar pitch and semi-coke mixture into a mortar at a ratio of 1:1, grind and mix evenly, add 3g of magnesium oxide and 3g of potassium hydroxide to the above mixture, and mix well.
[0032] (2) Transfer the mixture in step (1) to a high-temperature tube furnace in a nitrogen atmosphere, keep it at 120°C for 0.5 hours, then heat it to 600°C for 3 hours, the heating rate is 2°C / min, and cool naturally to room temperature.
[0033] (3) The product obtained in step (2) is taken out, ground and broken, washed with pickling and deionized water until neutral, dried, and ground to obtain a graphene / carbon composite material.
Embodiment 2
[0035] (1) Add 3g of tar pitch and semi-coke mixture into a mortar at a ratio of 1:9, grind and mix evenly, add 6g of magnesium hydroxide and 6g of potassium hydroxide to the above mixture, and mix well.
[0036] (2) Transfer the mixture in step (1) to a high-temperature tube furnace in a nitrogen atmosphere, keep it at 150°C for 1 hour, then heat it to 800°C for 0.5 hour, the heating rate is 5°C / min, and cool naturally to room temperature.
[0037] (3) The product obtained in step (2) is taken out, ground and broken, washed with pickling and deionized water until neutral, dried, and ground to obtain a graphene / carbon composite material.
[0038] The nitrogen adsorption / desorption curves of graphene / carbon composites are shown as figure 1 As shown, it can be seen that the graphene / carbon composite exhibits a high specific surface area, up to 2040m 2 / g.
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