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Preparation method of three-dimensional flocculent graphene substrate material and application

A technology of base material and graphene, applied in the field of preparation of three-dimensional flocculent graphene base material, can solve the problems of carbon structure defects, increase the specific surface area of ​​the material, and the negative effect of the electrical properties of the material, so as to reduce the internal resistance and improve the capacitance performance. , the effect of excellent electrical conductivity

Active Publication Date: 2014-11-26
安徽省泰达创投科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although KOH etching can form a rich microporous structure and greatly increase the specific surface area of ​​the material, it will also cause carbon structural defects and have a negative effect on the electrical properties of the material.

Method used

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  • Preparation method of three-dimensional flocculent graphene substrate material and application
  • Preparation method of three-dimensional flocculent graphene substrate material and application
  • Preparation method of three-dimensional flocculent graphene substrate material and application

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) Put graphite oxide in a crucible, heat the muffle furnace at a rate of 5°C / min to a temperature of 1000°C, put the crucible into the muffle furnace and keep it warm for 0.5min, then take out the crucible to obtain expanded graphite .

[0020] (2) Take 20 mg of expanded graphite and disperse it in 10 mL of water, add 800 μL of polystyrene (PS) beads water dispersion with a mass concentration of 2.5 wt % and 2 μm polystyrene (PS) beads, and then sonicate for 4 hours.

[0021] (3) The expanded graphite-polystyrene composite system dispersion liquid is directly sucked onto the foamed nickel at a rate of 4L / s, and after drying at 60°C for 18h, the foamed nickel loaded with expanded graphite-polystyrene is placed in 100mL In a mixed solution containing 100 μL of hydrazine hydrate and 700 μL of concentrated ammonia water with a mass concentration of 26%, react at 95°C for 1 hour, take it out, soak and wash it with deionized water for 5 times, and dry at 60°C for 18 hours t...

Embodiment 2

[0029] (1) Put graphite oxide in a crucible, heat the muffle furnace at a rate of 2°C / min to a temperature of 1100°C, put the crucible into the muffle furnace and keep it warm for 1min, then take out the crucible to obtain expanded graphite.

[0030] (2) Take 20 mg of expanded graphite and disperse it in 20 mL of water, add 600 μL of polystyrene (PS) beads water dispersion with a mass concentration of 5 wt % and 2 μm polystyrene (PS) beads, and then sonicate for 4 hours.

[0031] (3) The expanded graphite-polystyrene composite system dispersion liquid is directly sucked onto the foamed nickel at a rate of 4L / s, and after drying at 50°C for 15h, the foamed nickel loaded with expanded graphite-polystyrene is placed in 100mL In a mixed solution containing 100 μL of hydrazine hydrate and 700 μL of concentrated ammonia water with a mass concentration of 26%, react at 95°C for 1 hour, take it out, soak and wash it with deionized water for 5 times, and dry at 60°C for 15 hours to obta...

Embodiment 3

[0035] (1) Put graphite oxide in a crucible, heat the muffle furnace at a rate of 5°C / min to a temperature of 900°C, put the crucible into the muffle furnace and keep it warm for 1min, then take out the crucible to obtain expanded graphite.

[0036] (2) Take 20 mg of expanded graphite and disperse it in 10 mL of water, add 500 μL of polystyrene (PS) beads aqueous dispersion with a mass concentration of 3 wt % and a polystyrene (PS) bead of 2 μm, and then sonicate for 4 h.

[0037] (3) The expanded graphite-polystyrene composite system dispersion liquid is directly sucked onto the foamed nickel at a rate of 3L / s, and after drying at 40°C for 18h, the foamed nickel loaded with expanded graphite-polystyrene is placed in 100mL In a mixed solution containing 100 μL of hydrazine hydrate and 800 μL of concentrated ammonia water with a mass concentration of 25%, react at 95°C for 1 hour, take it out, soak and wash it with deionized water for 5 times, and dry at 60°C for 18 hours to obt...

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Abstract

A preparation method of a three-dimensional flocculent graphene substrate material and an application belong to the field of preparation of a functional nanometer material. The preparation method comprises the following steps: 1, graphite oxide is placed in a crucible to prepare expanded graphite; 2, 10-20mg of expanded graphite is dispersed in 10-30mL of water, 200-800 microliters of an aqueous dispersion liquid of polystyrene spheres is added and an ultrasonic treatment is carried out for 1h-4h; 3, suction filtration of a dispersion liquid of an expanded graphite-polystyrene compound system is carried out directly on foamed nickel, drying at 40-60 DEG C for 12-18h, the foamed nickel loaded with expanded graphite-polystyrene is placed in a mixed solution of hydrazine hydrate and ammonia with the volume ratio of hydrazine hydrate to ammonia being 1:5-1:10 so as to react at 90-95 DEG C for 1-3h, deionized water is used for immersion and washing, and drying is carried out; and 4, the temperature rises to 450-500 DEG C at the heating rate of 1-2 DEG C / min under a vacuum condition, and thermal insulation is carried out for 1-2h, and a finished product is taken out finally. The prepared material has a three-dimensional flocculent structure similar to a pore structure, has excellent conductivity and can be used to greatly reduce internal resistance of a capacitor and improve capacitive performance of an electrode active material. The preparation method is suitable for large-scale production of graphene.

Description

technical field [0001] The invention relates to a preparation method of a three-dimensional flocculent graphene base material applicable to fields such as supercapacitors, and belongs to the technical field of preparation of functional nanomaterials. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, have the characteristics of high power density, fast charging and discharging, and good cycle stability. They have become ideal new energy storage devices for a new generation and have attracted people's attention. Most of the electrode preparation methods reported publicly in the prior art are mainly to stir the active material powder, conductive agent and binder into a slurry and prepare the electrode used as a supercapacitor on the current collector by the method of coating, but this There is a certain contact resistance in the method of preparing electrodes, so it is necessary to prepare a base electrode material with high conductivity f...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 汪浩吴春卉严辉刘晶冰朱满康王波王如志
Owner 安徽省泰达创投科技有限公司
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