Preparation method for high-specific-capacitance graphene/high-surface-activated carbon composite material

A composite material and high specific capacitance technology, which is applied in the manufacture of hybrid/electric double layer capacitors, chemical instruments and methods, hybrid capacitor electrodes, etc., can solve the problems of large-scale production, low specific surface area utilization, and poor product quality. Advanced problems, to overcome the effect of high production cost, low cost and high utilization rate of specific surface area

Inactive Publication Date: 2017-03-08
DAYING JUNENG TECH & DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation of high surface activated carbon in China is mostly based on chemical activation method, but the product quality is not high, the production cost is relatively high, and there is no large-scale production
Moreover, such high-surface activated carbons still have disadvantages such as low specific capacitance and low specific surface area utilization in practical applications.

Method used

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  • Preparation method for high-specific-capacitance graphene/high-surface-activated carbon composite material
  • Preparation method for high-specific-capacitance graphene/high-surface-activated carbon composite material
  • Preparation method for high-specific-capacitance graphene/high-surface-activated carbon composite material

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Embodiment 1

[0030] According to the present invention, the expanded graphite and potassium permanganate are ground and mixed evenly, and then stirred and reacted together with concentrated sulfuric acid and sodium nitrate in an ice bath at 0° C. for 24 hours, so that the oxidizing agent fully penetrates into the expanded graphite sheet. After the reaction is over, heat to 35°C in a water bath and keep for 2h, add deionized water to dilute, then gradually add 30wt% hydrogen peroxide according to the mass percentage of the total weight, and stir at 90-95°C for 15min. At this time, the solution was golden yellow, filtered while it was hot, added 5wt% HCl solution to wash several times, then repeatedly washed with deionized water until neutral, and continued to filter until no free SO was detected in the filtrate. 4 2- . Take the above-mentioned exfoliated graphite oxide in secondary deionized water, prepare the exfoliated graphite oxide slurry for subsequent use, then add high-surface activ...

Embodiment 2

[0033] According to the present invention, the expanded graphite and potassium permanganate are ground and mixed evenly, and then stirred and reacted together with concentrated sulfuric acid and sodium nitrate in an ice bath at 0° C. for 24 hours, so that the oxidizing agent fully penetrates into the expanded graphite sheet. After the reaction is over, heat to 35°C in a water bath and keep for 2h, add deionized water to dilute, then gradually add 30% hydrogen peroxide, and stir at 90-95°C for 15min. At this time, the solution was golden yellow, filtered while hot, added 5% HCl solution to wash several times, then repeatedly washed with deionized water until neutral, and continued to filter until no free SO was detected in the filtrate. 4 2- . Take the above-mentioned exfoliated graphite oxide in secondary deionized water to prepare an exfoliated graphite oxide slurry for future use. Then add high surface activated carbon (mass ratio of high surface activated carbon to exfoli...

Embodiment 3

[0036] According to the present invention, the expanded graphite and potassium permanganate are ground and mixed evenly, and then stirred and reacted together with concentrated sulfuric acid and sodium nitrate in an ice bath at 0° C. for 24 hours, so that the oxidizing agent fully penetrates into the expanded graphite sheet. After the reaction is over, heat to 35°C in a water bath and keep for 2h, add deionized water to dilute, then gradually add 30% hydrogen peroxide, and stir at 90-95°C for 15min. At this time, the solution was golden yellow, filtered while hot, added 5% HCl solution to wash several times, then repeatedly washed with deionized water until neutral, and continued to filter until no free SO was detected in the filtrate. 4 2- . Take the above-mentioned exfoliated graphite oxide in secondary deionized water to prepare an exfoliated graphite oxide slurry for future use. Then add high surface activated carbon (the mass ratio of high surface activated carbon to ex...

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Abstract

The invention discloses a preparation method for a high-specific-capacitance graphene/high-surface-activated carbon composite material, and aims to provide the preparation method for active carbon composite material with low cost, high specific capacitance and high specific surface area utilization ratio. The preparation method is realized by the technical scheme as follows: taking peeled graphite oxide slurry as a raw material, and drying the graphite oxide slurry at a temperature of minus 40 to minus 20 DEG C; then reducing the graphite oxide into graphene oxide at a temperature of 200-500 DEG C, and adding high-surface-activated carbon in the graphite oxide stage; meanwhile, adding a dispersing agent to be stirred and mixed, and performing ultrasonic dispersion to enable the graphite oxide and the high-surface-activated carbon to be uniformly mixed, coating the surface of the high-surface-activated carbon with the graphite oxide to realize in-situ compositing of the graphite oxide and active carbon; and after performing low-temperature freezing and drying, performing puffing and reducing in the air atmosphere at a lower temperature of lower than 500 DEG C to reduce the graphite oxide into graphene oxide to prepare the in-situ composited graphene oxide/high-surface-activated carbon composite material.

Description

technical field [0001] The invention relates to a graphene / high surface active carbon composite material suitable for use as an electrode material of a supercapacitor or a capacitor battery and a preparation method thereof. Especially the preparation method of graphene / high surface activated carbon composite material with high specific capacitance. Background technique [0002] Graphene has a large specific surface area. If the surface energy of graphene is fully released, the specific capacitance value will be much higher than that of porous high surface activated carbon. Graphene is also the thinnest and hardest material in the world, and it is almost completely transparent. Its thermal conductivity is as high as 5300 W / (m k), which is higher than that of carbon nanotubes and diamonds. The electron mobility of graphene at room temperature exceeds 15000 cm 2 / (V s), which is higher than carbon nanotubes and silicon crystals, and the resistivity is only 1~6 Ω / cm 2 , is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/34H01G11/36C01B32/30
CPCY02E60/13H01G11/86C01P2002/82C01P2004/03C01P2004/04C01P2004/80H01G11/24H01G11/34H01G11/36
Inventor 漆长席李星胡键
Owner DAYING JUNENG TECH & DEV
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