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Preparation method of graphene

A graphene, graphene solution technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of reducing the specific surface area of ​​materials, agglomeration and stacking, etc., to improve specific capacity, reduce interface resistance, achieve The effect of mass production

Active Publication Date: 2016-08-17
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, graphene prepared by the existing redox method is prone to agglomeration and stacking due to π-π interaction, van der Waals force and hydrophobicity, which not only inhibits the infiltration of electrolyte and ion diffusion, but also significantly reduces the specific surface area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 100ml of graphene oxide aqueous solution with a concentration of 3mg mL-1, add 100mg of citric acid, and sonicate for 1h; according to the volume ratio of graphene solution to oil phase of 1:0.2, add methyl methacrylate and stir for 20min to prepare oxidation Graphene emulsion; heat the emulsion at 180°C for 3h to obtain the precursor; freeze-dry the precursor, and then react for 2h at 800°C in a nitrogen environment; take the reaction product to repeatedly wash with deionized water and dry, Get the graphene material.

[0037] The graphene prepared in this example is subjected to scanning electron microscopy (SEM), such as figure 1 As shown, it can be seen that graphene has a porous, internal cross-linked spherical structure, which is conducive to electrolyte diffusion and transmission, and this internal cross-linked layered structure as a conductive network is conducive to the transmission of electrons.

[0038] Weigh 80 mg of the graphene prepared in this example, 10 ...

Embodiment 2

[0040] Take 100ml of graphene oxide aqueous solution with a concentration of 0.5mg mL-1, add 50mg of citric acid, and ultrasonically treat for 1.5h; according to the volume ratio of graphene solution to oil phase of 1:0.5, add ethyl methacrylate and stir for 15min. Obtain graphene oxide emulsion; heat the emulsion at 190°C for 1 hour to obtain the precursor; freeze-dry the precursor, and then react in a nitrogen environment at 900°C for 3 hours; take the reaction product to repeatedly wash with deionized water and bake Dry to obtain graphene material.

Embodiment 3

[0042] Take 100ml of graphene oxide aqueous solution with a concentration of 4mg mL-1, add 200mg of citric acid, and ultrasonically treat for 0.5h; according to the volume ratio of graphene solution to oil phase of 1:2, add methyl methacrylate and stir for 5min to prepare. Graphene oxide emulsion; heat the emulsion at 200°C for 0.5h to obtain the precursor; freeze-dry the precursor, and then react for 1h at 1000°C in a nitrogen environment; take the reaction product to repeatedly wash with deionized water and bake Dry to obtain graphene material.

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Abstract

The invention provides a preparation method of graphene. A graphene oxide emulsion is obtained by mixing graphene oxide and an oil phase, and self-assembly of graphene oxide sheet layers on an emulsion interface is realized; besides, a hollow and porous graphene ball structure is prepared with a hydrothermal method by means of the characteristic that citric acid can generate gas after being hydrolyzed at high temperature, the structure facilitates diffusion and transmission of electrolyte ions, a ball-shaped structure serves as a conductive network, and agglomeration and stacking of the graphene sheet layers are inhibited; an inner-crosslinking ball-shaped structure is established to serve as the conductive network, transmission of electrons is facilitated, interface resistance is effectively reduced, the specific capacity and the multiplying power of a supercapacitor are increased, and the cycle performance of the supercapacitor is improved. The graphene is simple in structure, has a high specific surface area and high conductivity and can be applied to the supercapacitor. The preparation method is simple in process, the reaction process is easy to control, a little equipment investment is required, the graphene does not need to be prepared under a vacuum high-pressure condition, and large-scale production can be realized.

Description

Technical field [0001] The invention relates to a graphene for supercapacitors, in particular to a method for preparing graphene balls with a hollow and porous structure for supercapacitors. Background technique [0002] Supercapacitors have the characteristics of high power density, fast charge and discharge, long cycle life of millions of times, safety and reliability, etc., and have broad application prospects in the fields of rail transit, national defense and aerospace. However, the shortcomings of low energy density of supercapacitors restrict its rapid development. The energy density of commercial activated carbon supercapacitors is only 5~7Wh kg -1 . Therefore, in order to meet the growing demand for supercapacitors, the development of lightweight supercapacitors with high energy density, power density and good cycle stability is one of the development trends in the field of new energy. [0003] Graphene is a two-dimensional crystal composed of a layer of carbon atoms exfo...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/32H01G11/86
CPCH01G11/24H01G11/32H01G11/86Y02E60/13
Inventor 徐丽刘双宇陈新韩钰盛鹏刘海镇赵广耀王博
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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