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Preparation method of graphene and application of prepared graphene

A technology of graphene and graphite, applied in the field of battery materials, to achieve excellent electrochemical performance, mild reaction conditions, and lower reaction temperature

Inactive Publication Date: 2015-06-03
SHANGHAI YUEDA NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no relevant literature report on the preparation of graphene by the method and its application in lithium batteries.

Method used

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  • Preparation method of graphene and application of prepared graphene

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Effect test

Embodiment 1

[0014] A kind of method for preparing graphene oxide as above, with 9 g graphite, 9g NaNO 3 , and 900 ml of 98% concentrated sulfuric acid were stirred evenly in an ice-water bath, and 54 g of KMnO 4 Slowly add to the mixture and react for 2 h; then transfer to a water bath at 35 °C and continue to react for 12 h, then dilute the mixture to 2700 ml, add 300 ml of 30% H 2 o 2 Stir for 30 min, the solution turns from brown to golden yellow, centrifuged, the product is washed with 5% HCl and distilled water successively, and the product is graphite oxide after drying.

[0015] A method for preparing graphene as described above, dispersing graphite oxide ultrasonically in N,N-dimethylformamide solution for 1h to form a uniform dispersion of 10 mg / mL; transferring the dispersion to a hydrothermal reaction kettle, Using hydrazine hydrate as a reducing agent, the reaction was carried out at 160 °C for 12 h, and the obtained product was washed with ethanol and dried to obtain graphe...

Embodiment 2

[0019] A kind of method for preparing graphene oxide as above, with 3 g graphite, 3g NaNO 3 , 300 ml of 98% concentrated sulfuric acid were stirred evenly in an ice-water bath, and 18 g of KMnO 4 Slowly add to the mixture, react for 2 h; then transfer to a water bath at 35 °C and continue to react for 12 h, then dilute the mixture to 900 ml, add 100 ml of 30% H 2 o 2 Stir for 30 min, the solution turns from brown to golden yellow, centrifuged, the product is washed with 5% HCl and distilled water successively, and the product is graphite oxide after drying.

[0020] A method for preparing graphene as described above, dispersing graphite oxide ultrasonically in N,N-dimethylformamide solution for 1h to form a uniform dispersion of 10 mg / mL; transferring the dispersion to a hydrothermal reaction kettle, Using hydrazine hydrate as the reducing agent, the reaction was carried out at 120 °C for 10 h, and the obtained product was washed with ethanol and dried to obtain graphene.

...

Embodiment 3

[0024] A kind of method for preparing graphene oxide as above, with 3 g graphite, 3g NaNO 3 , 300 ml of 98% concentrated sulfuric acid were stirred evenly in an ice-water bath, and 18 g of KMnO 4 Slowly add to the mixture, react for 2 h; then transfer to a water bath at 35 °C and continue to react for 12 h, then dilute the mixture to 900 ml, add 100 ml of 30% H 2 o 2 Stir for 30 min, the solution turns from brown to golden yellow, centrifuged, the product is washed with 5% HCl and distilled water successively, and the product is graphite oxide after drying.

[0025] A method for preparing graphene as described above, dispersing graphite oxide ultrasonically in N,N-dimethylformamide solution for 1h to form a uniform dispersion of 10 mg / mL; transferring the dispersion to a hydrothermal reaction kettle, Using hydrazine hydrate as a reducing agent, the reaction was carried out at 120 °C for 24 h. The obtained product was washed with ethanol and dried to obtain graphene.

[0026...

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Abstract

The invention discloses a method for preparing graphene. The method is characterized in that the graphene is applied in a lithium battery as an electrode to show excellent electrochemical property; under the 0.2C testing multiplying power, the first-time specific discharge capacity is 922mAhg<-1>, and after circulation for 10 times, the specific discharge capacity is maintained to be 380Ahg<-1> still. The method for preparing the graphene under simple and mild condition has the advantages that the graphite oxide is prepared by two-step mixed reaction, so that the reaction temperature is greatly reduced; furthermore, hydrazine hydrate is utilized as a reduction agent, so that the reduction temperature is reduced; the reaction condition is mild, the operation is simple, the convenient and effective effects are achieved, the cost for industrially producing the graphene is greatly reduced, and the electrochemical property of the graphene prepared by the method is excellent.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a graphene electrode material obtained through a simple reaction and a preparation method and application thereof. Background technique [0002] The core of lithium-ion batteries is lithium storage materials. As a new type of carbon nanomaterial, graphene's large specific surface area and good electrical properties determine its great potential in the field of lithium-ion batteries, with a theoretical capacity of 740-780 mAh g -1 , which is about twice that of traditional graphite materials, and graphene has been reported as a negative electrode material for lithium-ion batteries. However, there is no relevant literature report on the preparation of graphene by the method and its application in lithium batteries. Contents of the invention [0003] The invention discloses a method for preparing graphene. The graphene is used as an electrode material in a lithium b...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01M4/38
CPCY02E60/10
Inventor 黎阳谢华清徐玉霞
Owner SHANGHAI YUEDA NEW MATERIAL TECH
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