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Graphene/carbon ball composite material, and preparation and application thereof

A composite material and graphene technology, applied in the field of composite materials, can solve the problems of low capacitance and easy agglomeration capacitance, and achieve the effects of wide sources, reduced agglomeration, and low cost

Inactive Publication Date: 2012-06-20
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the effect of van der Waals force makes it easy to reunite or re-stack, resulting in the result that the actual specific capacitance is not high

Method used

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  • Graphene/carbon ball composite material, and preparation and application thereof
  • Graphene/carbon ball composite material, and preparation and application thereof
  • Graphene/carbon ball composite material, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of composite materials

[0045] (1) Preparation of graphite oxide: Take 92ml of concentrated sulfuric acid with a mass fraction of 98% in a 1000ml beaker, use an ice-water bath to lower the temperature below 4°C, stir vigorously and add 4g of high-temperature pyrolysis graphite powder at the same time; After stirring vigorously in a water bath for 0.5h, add 3g of sodium nitrate and 12g of potassium permanganate in turn; after vigorously stirring in an ice-water bath for 1h, take out the beaker, allow it to stir vigorously at room temperature for 3h, then slowly add 300ml of distilled water; After recovering to room temperature, add 500ml of distilled water again, and add 50ml of hydrogen peroxide with a mass fraction of 30% after 10min; Washed several times until there is no SO in the filtrate 4 2- It exists and is neutral; the suction-filtered product is vacuum-dried at 60°C for 18 hours, and ground into powder to obtain graphite oxide.

[0046] (2) ...

Embodiment 2

[0056] (1) Preparation of composite materials

[0057] (1) Preparation of graphite oxide: same as in Example 1.

[0058] (2) Preparation of graphene oxide precursor dispersion: Weigh 0.08g of graphite oxide, add it into 400ml of distilled water under strong stirring, adjust the pH to 9-10 with 10% ammonia water, and ultrasonicate it at room temperature for 1h. A 0.2 mg / ml graphene oxide precursor dispersion was obtained.

[0059] (3) Preparation of carbon spheres: Dissolve 11.52g of glucose in 160ml of distilled water, transfer the glucose solution to a 200ml autoclave with polytetrafluoroethylene liner, and conduct hydrothermal treatment at 180°C for 7h. The hydrothermal product was suction filtered and washed repeatedly with ethanol and distilled water. After washing, the product was vacuum-dried at 60° C. for 12 hours to obtain carbon spheres.

[0060] (4) Preparation of carbon sphere dispersion: Weigh 15 mg of carbon spheres, grind them into powder, add them to 100 ml o...

Embodiment 3

[0068] (1) Preparation of composite materials

[0069] (1) Preparation of graphite oxide: Same as Example 1.

[0070] (2) Preparation of graphene oxide precursor dispersion: Weigh 0.12g of graphite oxide, add it into 300ml of distilled water under strong stirring, adjust the pH to 9-10 with 10% ammonia water, and ultrasonicate it at room temperature for 1h. A 0.4 mg / ml graphene oxide precursor dispersion was obtained.

[0071] (3) Preparation of carbon spheres: Weigh 10.176g of glucose and dissolve it in 160ml of distilled water, transfer the glucose solution to a 200ml autoclave with polytetrafluoroethylene liner, and conduct hydrothermal treatment at 170°C for 5h. The hydrothermal product was suction filtered and washed repeatedly with ethanol and distilled water. After washing, the product was vacuum-dried at 60° C. for 12 hours to obtain carbon spheres.

[0072] (4) Preparation of carbon sphere dispersion: Weigh 20 mg of carbon spheres, grind them into powder and add them...

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Abstract

The invention provides a preparation method of a graphene / carbon ball composite material, belonging to the technical field of composite materials. The method comprises the following steps of: obtaining a graphene oxide precursor solution in an ultrasonic stripping manner; carrying out hydro-thermal treatment of glucose under a certain temperature to obtain carbon balls; and then self-assembling and reducing graphene oxide and the carbon balls under a certain condition to obtain the graphene / carbon ball composite material. The composite material is used as an electrode material of a super-capacitor. Because graphene agglomeration can be effectively prevented through the carbon balls in the composite material, a graphene electric double layer capacitor can be well displayed, therefore, the composite material shows excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to a graphene / carbon sphere composite material; the invention also relates to the preparation of the graphene / carbon sphere composite material and its application in preparing supercapacitor electrodes. Background technique [0002] With the improvement of living standards, the crisis of environmental pollution and energy shortage has aroused great concern. Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage device between traditional capacitors and batteries. It has higher specific capacitance and energy density than traditional capacitors, higher power density than batteries, can release extremely large current instantly, has short charging time, high charging efficiency, long cycle life, no memory effect and basically no maintenance And so on, its application prospect is very broad. As we all know, electrode materials are the core of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/058H01G11/38H01G11/86
Inventor 胡中爱张富海张亚军张海英梁鹏举张子瑜杨玉英
Owner NORTHWEST NORMAL UNIVERSITY
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