Graphene/carbon nano-tube composite material, preparation method and application thereof
A technology of carbon nanotubes and composite materials, which is applied in the field of electrochemical materials, can solve the problems of unusable energy storage, easy agglomeration of graphene sheets, and low energy storage capacity of graphene, so as to achieve low agglomeration, high conductivity, and high The effect of energy storage capacity and rate performance
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[0022] The preparation method of the composite electrode material adopts an oxidation-reduction method, and the equipment and process are simple, easy to operate, and easy to realize large-scale industrial production.
[0023] The graphene / carbon nanotube composite material prepared by the above method includes 50% to 85% of graphene and 15% to 50% of carbon nanotubes according to the mass ratio. The graphene / carbon nanotube composite material has low agglomeration of graphene sheets and high electrical conductivity, so that the composite material has high energy storage capacity and rate performance when used as an electrode material for an electrochemical capacitor.
[0024] The following are the applications of graphene / carbon nanotube composites
[0025] Graphene / carbon nanotube composites are generally used as electrode materials for electrochemical capacitors. The following describes how to use this material to make electrochemical capacitors.
[0026] First, mix the gr...
Embodiment 1
[0032] The present invention prepares the technological process of graphene / carbon nanotube composite material as follows:
[0033] Graphite→graphite oxide→graphene / carbon nanotube composite
[0034] (1) Graphite: purity 99.5%;
[0035] (2) Graphite oxide: Weigh 1g of graphite with a purity of 99.5% in (1) and add it to a mixed solution consisting of 90ml of concentrated sulfuric acid (98% by mass fraction) and 25ml of concentrated nitric acid (65% by mass fraction). Place in an ice-water mixed bath environment and stir for 20 minutes, then slowly add 6g of potassium permanganate to the mixture, stir for 1 hour, then heat the mixture to 85°C and keep it for 30 minutes, then add 92ml of deionized water Continue to keep at 85°C for 30 minutes, finally add 10ml of hydrogen peroxide solution (mass fraction 30%), stir for 10 minutes, filter the mixture with suction, and then use 100ml of dilute hydrochloric acid and 150ml of deionized water to treat the solids successively. Washi...
Embodiment 2
[0038] The present invention prepares the technological process of graphene / carbon nanotube composite material as follows:
[0039] Graphite→graphite oxide→graphene / carbon nanotube composite
[0040] (1) Graphite: purity 99.5%;
[0041] (2) Graphite oxide: Weigh 5g of graphite with a purity of 99.5% in (1) and add it to a mixed solution consisting of 475ml of concentrated sulfuric acid (98% by mass fraction) and 120ml of concentrated nitric acid (65% by mass fraction). Place in an ice-water mixed bath environment and stir for 20 minutes, then slowly add 20g of potassium permanganate to the mixture, stir for 1 hour, then heat the mixture to 85°C and keep it for 30 minutes, then add 92ml of deionized water Continue to keep at 85°C for 30 minutes, finally add 30ml of hydrogen peroxide solution (mass fraction 30%), stir for 10 minutes, filter the mixture with suction, and then use 300ml of dilute hydrochloric acid and 450ml of deionized water to treat the solids successively. Wa...
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