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Preparation method of supercapacitor based on grapheme-carbon nanotube composite material

A technology of supercapacitors and carbon nanotubes, applied in capacitors, electrolytic capacitors, liquid electrolytic capacitors, etc., can solve the problems affecting the preparation of capacitors, low yield, long time, etc., and achieve good thermal and chemical stability, electrical conductivity Good performance and good solubility

Active Publication Date: 2012-04-11
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method takes a long time and has a low yield, which further affects the preparation of capacitors using this composite material

Method used

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  • Preparation method of supercapacitor based on grapheme-carbon nanotube composite material
  • Preparation method of supercapacitor based on grapheme-carbon nanotube composite material
  • Preparation method of supercapacitor based on grapheme-carbon nanotube composite material

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preparation example Construction

[0026] Such as figure 1 Shown, the preparation method based on graphene-carbon nanotube composite supercapacitor of one embodiment mainly comprises the following steps:

[0027] S110: Provide graphene with charged ionic groups on the surface and carbon nanotubes with charged ions on the surface. Wherein, the electrical properties of the charged ionic groups on the surface of graphene and the enriched charge anisotropy on the surface of carbon nanotubes; preferably, the molar ratio of graphene to carbon nanotubes is 1:1.

[0028] Graphene enriched with charged ionic groups on the surface can be prepared, but not limited to, using the following graphite rod electrolysis method: such as figure 2 As shown, two graphite rods are used as electrodes, placed in the second electrolytic solution, and electrolyzed at a power supply voltage of 5-20V for 0.5-6h to obtain a mixed solution of graphene enriched with charged ionic groups on the surface; then the The mixed solution is centri...

Embodiment 1

[0043] Embodiment 1: graphite rod → graphene → graphene-carbon nanotube composite material → electrode sheet → supercapacitor:

[0044] (1) Graphite rods: graphite rods with a purity of 99.9%.

[0045] (2) Graphene: The preparation of graphene enriched with charged ion groups on the surface is to insert two high-purity graphite rods in parallel into an aqueous solution containing ammonium nitrate, control the voltage at 5V, and electrolyze for 30 minutes. Corroded, black products are gradually generated, and the anions in the electrolyte are gradually gathered at the anode, and the electrolysis is continued for 3 hours, and the obtained suspension is centrifuged to remove the agglomerated precipitate, and washed repeatedly with deionized water and absolute ethanol, at 80 °C for 2 hours under vacuum to obtain 3 - of graphene.

[0046] (3) Graphene-carbon nanotube composite material: the band NO obtained in the above (2) 3 - Graphene was dissolved in an aqueous solution, so...

Embodiment 2

[0050] Embodiment 2: graphite rod→graphene→graphene-carbon nanotube composite material→electrode sheet→supercapacitor:

[0051] (1) Graphite rods: graphite rods with a purity of 99.9%.

[0052] (2) Graphene: the preparation method of the graphene that the surface is enriched with charged ion group is that two high-purity graphite rods are inserted in parallel in the electrolytic solution that volume ratio is 1: 1 imidazolium hexafluorophosphate and water, Control the voltage at 10-20V, after 30 minutes of electrolysis, the graphite rod of the anode is inserted by the cation in the ionic liquid, and the exfoliated black single-layer graphene product is gradually generated, and the electrolysis is continued for 6 hours, and the obtained suspension is centrifuged to obtain The agglomerated precipitate was removed, washed repeatedly with deionized water and absolute ethanol, and vacuum-dried at 60°C for 4 hours to obtain graphene with imidazolyl cations.

[0053] (3) Graphene-car...

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Abstract

The invention discloses a preparation method of a supercapacitor based on a grapheme-carbon nanotube composite material. Firstly, blending is performed to the grapheme and the carbon nanotube which are with opposite charges. Through an electrostatic attraction effect, the carbon nanotube is inserted into the grapheme so as to obtain the grapheme-carbon nanotube composite material. Then, the obtained grapheme-carbon nanotube composite material is used to prepare an electrode slice of the supercapacitor and packaging is performed so as to obtain the supercapacitor. In a traditional preparation method, the grapheme-carbon nanotube composite material is prepared by directly blending and then the supercapacitor is formed by assembling. Compared to the traditional preparation method, by using the preparation method of the invention, a composite material production rate is high and a supercapacitor preparation efficiency can be improved greatly. An ionic liquid is taken as a electrolyte. And a decomposition voltage of the ionic liquid is higher than the decomposition voltage of a traditional water system electrolyte and an organic electrolyte.

Description

【Technical field】 [0001] The invention relates to the field of supercapacitor preparation, in particular to a method for preparing a supercapacitor based on a graphene-carbon nanotube composite material. 【Background technique】 [0002] A supercapacitor, also known as an ultra-large-capacity electrochemical capacitor, is a new type of energy storage device between ordinary capacitors and secondary batteries. The energy density stored in supercapacitors is more than 10 times that of traditional capacitors. Compared with batteries, it has the advantages of higher power density, short charge and discharge time, high charge and discharge efficiency, and long cycle life. At the same time, supercapacitors also have operating temperature Wide range (-40°C ~ 75°C), good reliability, energy saving and environmental protection, etc., so it can be widely used as a backup power supply for microcomputers, solar chargers, alarm devices, household appliances, camera flashes and aircraft ign...

Claims

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Application Information

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IPC IPC(8): H01G9/042H01G9/145
CPCY02E60/13
Inventor 周明杰吴凤王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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