Porous graphene and preparation method thereof

A technology of porous graphene and graphite, which is applied in the field of carbon materials, can solve the problems of low energy density, decreased specific capacity, and hindered ion diffusion of activated carbon, etc., and achieve the effect of high rate charge and discharge performance and high specific surface area

Active Publication Date: 2013-11-20
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, activated carbon has a low energy density and can only be used in aqueous electrolytes, while 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF) with a working voltage of up to 4V 4 ) When used in ionic liquid electrolytes, it has the following disadvantages: the conductivity is poor, and most of the pores are distributed inside the particles. Under high current charge and discharge, the diffusion of ions in the tortuous activated carbon pores is hindered, and the specific capacity drops rapidly.
At present, the energy density of commercial organic supercapacitors based on mesoporous activated carbon is only 5-6Wh / kg, which is still far behind the energy density of lithium-ion batteries (about 150Wh / kg).

Method used

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preparation example Construction

[0026] The invention provides a preparation method of porous graphene, comprising the following steps: under the action of an oxidizing agent, graphite substances and sulfur are heated and reacted in a solvent to obtain porous graphene, and the graphite substances are graphene oxide, One or more of graphene and nano-graphite microflakes.

[0027] The porous graphene prepared by the method of the invention has a mesopore structure and a relatively high specific surface area.

[0028] All the raw materials of the present invention have no special limitation on their sources, they can be purchased in the market.

[0029] The present invention is not particularly limited to the source of described graphene oxide, preferably adopts improved Hummers method preparation:

[0030] 1.5g of graphite, 1.5g of potassium nitrate and 90mL of concentrated sulfuric acid were mixed and reacted with 9g of potassium permanganate. After the reaction, 100mL of deionized water and 2mL of hydrogen p...

Embodiment 1

[0053] First, 1.5g of graphite, 1.5g of potassium nitrate and 90mL of concentrated sulfuric acid were mixed and reacted with 9g of potassium permanganate. After the reaction, 100mL of deionized water and 2mL of hydrogen peroxide were added to obtain 2g of graphene oxide.

[0054] Then 0.6g of sulfur was dissolved in 10ml of carbon disulfide to obtain a carbon disulfide solution of sulfur, 0.3g of graphene oxide was impregnated in the solution of carbon disulfide of sulfur, and the impregnated graphene oxide was dried to obtain the first mixture.

[0055] Dissolve 10 g of potassium nitrate in 50 ml of deionized water to obtain an aqueous potassium nitrate solution, then mix the first mixture with the aqueous potassium nitrate solution evenly, and dry to obtain a second mixture.

[0056] Finally, the above-mentioned second mixture was subjected to microwave treatment with a power of 1 kilowatt and a treatment time of 3 minutes. After the treatment, the mixture was taken out and w...

Embodiment 2

[0063] Dissolve 6g of sulfur in 50ml of carbon disulfide to obtain a carbon disulfide solution of sulfur, impregnate 3g of nanometer graphite flakes in the above carbon disulfide solution of sulfur, and then dry the impregnated graphite nanometer flakes to obtain the first mixture.

[0064] Dissolve 10 g of potassium nitrate in 50 ml of deionized water to obtain an aqueous potassium nitrate solution, then mix the first mixture with the aqueous potassium nitrate solution evenly, and dry to obtain a second mixture.

[0065] Finally, the above-mentioned second mixture was heated in a muffle furnace for 30 seconds at a temperature of 500°C. After the treatment, it was taken out and washed with deionized water to remove ions, and dried to obtain 2g of porous graphene.

[0066] Detected by a transmission electron microscope, the pore diameter of the porous graphene obtained by the present invention is about 5-45 nm. The obtained porous graphene is tested by nitrogen adsorption, and ...

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Abstract

The invention provides a porous graphene and a preparation method thereof. The preparation method comprises the following steps: under the action of an oxidant, heating a graphite substance and sulfur in a solvent to react, thereby obtaining the porous graphene, wherein the graphite substance is one or more of graphene oxide, graphene and graphite microsheets. The porous graphene provided by the invention has a mesopore structure, and thus, has higher specific area. When the porous graphene provided by the invention is used in a supercapacitor electrode material, the supercapacitor has favorable high-power charging / discharging property.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to a porous graphene and a preparation method thereof. Background technique [0002] With the continuous expansion of the information society and the emergence of environmental and energy crises, the issue of energy storage and conversion efficiency is becoming more and more important. In various energy conversion systems, supercapacitors are used in backup power supplies, start-up power supplies, pulse power supplies, power grids, etc. areas of balance. According to different energy storage mechanisms, supercapacitors can be divided into electric double layer capacitors and pseudocapacitors. Electric double-layer capacitors mainly rely on the electric double layer at the interface between the electrode and the electrolyte to store charge, and use the huge specific surface area of ​​the electrode material to store electrical energy through physical processes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 周旭峰刘兆平郑超王国华
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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