A kind of preparation method and application of large-area graphene

A graphene and large-area technology, applied in the direction of graphene, nano-carbon, structural parts, etc., can solve the problems of lack of graphene surface functions, unfavorable large-scale production, and restricted material development, etc., to achieve low cost, short cycle, and process The effect of short process

Active Publication Date: 2020-03-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, people have made some progress in the preparation of graphene, and developed methods such as mechanical exfoliation, chemical oxidation, and CVD gas. The graphene produced by mechanical exfoliation has less content and higher energy consumption, which is not conducive to large-scale Production
The chemical oxidation method has low safety, the reaction is difficult to control, and the surface functions of the produced graphene will be lost, and the steps are cumbersome
However, the high cost of the CVD gas phase method also limits the further development of materials.

Method used

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  • A kind of preparation method and application of large-area graphene
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  • A kind of preparation method and application of large-area graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Mix 0.4g of carbon quantum dots and 4.0g of nickel chloride evenly, and then calcinate them at 700°C for 5h under the protection of Ar gas, with a heating rate of 10°C / min, and naturally cool down. Grind the calcined product into powder, add an appropriate amount of concentrated hydrochloric acid, adjust its pH to neutral, centrifuge at 10000r / min for 10min, wash with deionized water for 5 times, and vacuum dry at 100°C for 12h to obtain a black powder 0.16g. Its scanning electron microscope picture is figure 1 , it can be seen that the product is nano flakes (width can reach 30 μm). figure 2 Its transmission electron microscope picture is consistent with the scanning electron microscope result. image 3 Is its X-ray diffraction spectrum, the product that obtains is graphene carbon.

[0040] Mix the obtained graphene material, sodium carboxymethyl cellulose, and conductive carbon black evenly in a mass ratio of 70:15:15, add an appropriate amount of ultrapure water ...

Embodiment 2

[0042] Mix 0.4g PEG-6000 and 4.0g nickel chloride evenly, and then calcinate it at 750°C for 5h under the protection of Ar gas, with a heating rate of 8°C / min, and naturally cool down. Grind the calcined product into powder, add an appropriate amount of concentrated hydrochloric acid, adjust its pH to neutral, centrifuge at 10000r / min for 10min, wash with deionized water for 5 times, and vacuum dry at 100°C for 12h to obtain a black powder 0.15g. Its scanning electron microscope picture is Figure 4 , it can be seen that the product is a nano-sheet, and the surface area of ​​the graphene material is relatively large (the width can reach 30 μm). Figure 5 Its transmission electron microscope picture is consistent with the scanning electron microscope result.

[0043] Mix the obtained graphene material, sodium carboxymethyl cellulose, and conductive carbon black evenly in a mass ratio of 70:15:15, add an appropriate amount of ultrapure water to make a slurry and apply it on th...

Embodiment 3

[0045] Mix 0.4g carbon quantum dots and 4.0g nickel chloride evenly, and then 2 Under gas protection, it was calcined at 800°C for 4h, the heating rate was 10°C / min, and the temperature was lowered naturally. Grind the calcined product into powder, add an appropriate amount of concentrated hydrochloric acid, adjust its pH to neutral, centrifuge at 10000r / min for 10min, wash with deionized water for 5 times, and vacuum dry at 100°C for 12h to obtain a black powder 0.13g. Its scanning electron microscope picture is Figure 6 , it can be seen that the product is nano flakes (width can reach 30 μm). Figure 7 Its transmission electron microscope picture is consistent with the scanning electron microscope result.

[0046] Mix the obtained graphene material, sodium carboxymethyl cellulose, and conductive carbon black evenly in a mass ratio of 70:15:15, add an appropriate amount of ultrapure water to make a slurry and apply it on the copper foil, and place it in the After drying ...

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Abstract

The invention discloses a preparation method and application of large-area graphene. The method comprises the steps of mixing an oxygen-containing organic polymer and a nickel salt, placing the mixture in an inertia atmosphere for calcination, washing the calcinated product with an acid liquid, and drying the product to obtain the large-area graphene. The method is simple and convenient to operate, and is short in period and high in yield, and industrial production is facilitated; and the obtained large-area graphene can be used as a sodium ion battery electrode material and has excellent electrochemical performance.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for preparing large-area graphene in one step by calcining metal nickel salt and polymer, and its application in sodium-ion batteries, which belongs to the preparation technology of sodium-ion battery materials field. Background technique [0002] There are many members of the carbon material family, including fullerenes, carbon nanospheres, carbon nanotubes, carbon nanofibers, graphene, carbon nanosheets, porous carbon, etc. Carbon materials are widely used in many fields due to their abundant sources, low price, and environmental protection, such as biotechnology, drug loading, catalysis, batteries, supercapacitors, etc. It can be said that carbon materials are one of the most functional materials. [0003] Graphene, as a new star in the family of carbon materials, has been attractive since it was discovered. On October 5, 2010, the Royal Swedish Academy of Sciences ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587C01B32/184
CPCH01M4/587Y02E60/10
Inventor 纪效波葛鹏侯红帅邱晓清
Owner CENT SOUTH UNIV
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