Modified graphene and preparation method thereof

A graphene and modification technology, applied in the field of modified graphene and its preparation, can solve problems such as difficulty in realizing large-scale graphene production, and achieve the effects of excellent electrochemical performance, excellent compatibility, and high capacity

Active Publication Date: 2015-01-07
深圳石墨烯创新中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to achieve large-scale graphene production

Method used

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Examples

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Effect test

preparation example Construction

[0028] The present invention provides a method for preparing modified graphene, which in one embodiment includes the following steps:

[0029] (1) At -10℃~200℃, the graphite and the polar functional group-containing substance are mixed uniformly in a mass ratio of 1:0.1~50, and at a certain reaction temperature and reaction time, through one-step reaction or multi-step reaction , Grafting the target polar functional group onto the graphite sheet, the target polar functional group including the polar functional group contained in the polar functional group-containing substance and / or the polar functional group-containing substance and graphite Polar functional groups produced by the reaction;

[0030] (2) Remove the unreacted raw materials in step (1) and / or impurities generated during the reaction, and then dry and pulverize to obtain powdered graphite grafted with the target polar functional group;

[0031] (3) Place the powdered graphite in step (2) in a protective gas, heat and c...

Embodiment 1

[0044] Step (1): Multi-step reaction is adopted, that is, 10g graphite and 400g phosphoric acid are mixed uniformly in an environment of 1°C, then stirred at 35°C for 50min, and reacted at 98°C for 2 hours to graft phosphate to On graphite flakes;

[0045] Step (2): Add water to the reaction product obtained in step (1), and then continue to wash until no phosphate ion is detected in the washing solution, then dry and pulverize to obtain powdered graphite grafted with phosphate;

[0046] Step (3): Place the powdered graphite prepared in step (2) in an atmosphere containing 95% (volume fraction) of nitrogen and 5% (volume fraction) of phosphine, and adjust the pressure of the atmosphere to 0.1 MPa at 400°C After heating and cleaving for 3 hours, a modified graphene grafted with phosphate radicals on the graphene sheet was prepared. The mass fraction of phosphate radicals in the modified graphene was 9%, and the capacitance value of the material could reach 245 F / g.

Embodiment 2

[0048] The difference from Example 1 is that the phosphoric acid in step (1) is changed to nitric acid, and the phosphine in step (3) is changed to ammonia gas. The prepared graphene sheet is grafted with amino, pyridine nitrogen, and pyrrole. Nitrogen-modified graphene, amino, pyridine nitrogen, and pyrrole nitrogen account for 5%, 2%, and 3% of the modified graphene, respectively, and the capacitance value of the material can reach 455 F / g.

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Abstract

The invention discloses a preparation method of modified graphene, which comprises the following steps that: (1) graphite and materials with polar functional groups are uniformly mixed according to a mass ratio of 1:(0.1-50) at subzero 10 DEG C to 200 DEG C, and react at a certain temperature and within a certain time for one step or more steps, object polar functional groups are grafted onto graphitic sheet layers, the object polar functional groups comprise all the polar functional groups contained in the materials with the polar functional groups and / or polar functional groups generated by the reaction between the materials with the polar functional groups with the graphite; (2) the unreacted raw materials in Step (1) and / or impurities produced in the reaction are removed, and the graphite powder grafted with the object polar functional groups is obtained through drying and crushing; and (3) the graphite powder produced in Step (2) is heated and cleaved in protective gas, then the modified graphene grafted with the object polar functional groups on the sheet layers is obtained, and the mass percent of the goal polar functional groups in the modified graphene is 0.01-50%.

Description

Technical field [0001] The invention belongs to the field of graphene and its preparation, and specifically relates to a modified graphene and a preparation method thereof. Background technique [0002] Graphene refers to a sheet-like body arranged in a hexagonal ring between carbon atoms. It is usually composed of a single layer or multiple layers of graphite sheets, which can extend infinitely in a two-dimensional space. It can be said to be two in the strict sense. Since Andre K. Geim (Andre K. Geim) of the University of Manchester in the United Kingdom prepared the material by mechanical stripping method in 2004, its excellent performance has received extensive attention. [0003] Graphene has outstanding advantages such as large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient. Specifically: high specific surface area (theoretical calculation value: 2,630m 2 / g); high conductivity, carrier transfer rate (200,000cm 2 / V...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 杨全红游从辉魏伟吕伟李宝华康飞宇
Owner 深圳石墨烯创新中心有限公司
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