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Graphene/conductive polymer composite material and preparation method thereof

A conductive polymer and composite material technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of limited material application, agglomeration rate characteristics, poor uniformity of composite products, etc., to avoid agglomeration and improve rate performance.

Active Publication Date: 2013-01-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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AI Technical Summary

Problems solved by technology

[0004] The prior art discloses the preparation method of multiple graphene / polyaniline composite materials, such as Shi Gaoquan etc. reported a kind of preparation method of graphene / polyaniline composite electrode material, and this method mixes graphene and polyaniline nanofiber after vacuum Filter to obtain graphene / polyaniline composite electrode material, and its specific capacitance reaches 210F.g -1 , after 800 cycles, the capacity loss is 26.1% (ACS NANO, 2010, Vo1.4, 1963-1970), but graphene is very easy to agglomerate in this method, and it is difficult to obtain a composite material with a uniform structure using the above technology
Chinese patent 201110196313.5 discloses a preparation method of graphene-supported ordered polyaniline nanorod electrode material. In this method, sulfonated graphene is uniformly dispersed in an acidic aqueous solution dissolved in an oxidizing agent, and then mixed with aniline solution. Standing reaction at ~0°C to obtain graphene-loaded ordered polyaniline nanorod electrode materials, but this method requires low-temperature treatment, and the acidic aqueous solution used is prone to solidification at low temperatures, and the prepared composite product has poor uniformity and flakes. Composite materials with a structure are prone to agglomeration during high-current charging and discharging, which affects their rate characteristics and limits the application of the material.

Method used

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  • Graphene/conductive polymer composite material and preparation method thereof
  • Graphene/conductive polymer composite material and preparation method thereof
  • Graphene/conductive polymer composite material and preparation method thereof

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preparation example Construction

[0027] The invention provides a kind of preparation method of graphene / conductive polymer composite material, comprises the following steps:

[0028] A) Spray drying the graphene solution or the modified graphene solution to obtain graphene microspheres;

[0029] B) mixing and infiltrating the graphene microspheres obtained in the step A) with the liquid conductive polymer monomer to obtain a reaction precursor;

[0030] C) mixing the reaction precursor obtained in step B) with an acid solution containing an oxidizing agent, and performing a polymerization reaction to obtain an intermediate product;

[0031] D) reducing the intermediate product obtained in step C) to obtain a graphene / conductive polymer composite material.

[0032] In the present invention, firstly, the graphene solution or the modified graphene solution is spray-dried to obtain graphene microspheres, and then the obtained graphene microspheres are mixed with a liquid conductive polymer monomer, infiltrated, ...

Embodiment 1

[0050] Spray-dry the graphene oxide aqueous solution with a concentration of 0.01wt% at 100°C to obtain graphene oxide microspheres, then mix 0.1g of the obtained graphene oxide microspheres with 1g of aniline monomer, and fully infiltrate to obtain the mixture , add this mixture with 2g of ammonium persulfate and 0.1g of sodium dodecylbenzenesulfonate to 100ml of hydrochloric acid solution with a concentration of 0.1mol / L, react for 5h under stirring conditions to obtain a reaction product, and hydrate the reaction product Hydrazine reduction yields spherical graphene / polyaniline composites.

[0051] Its morphology was detected by scanning electron microscopy, and the results were shown in figure 1 and figure 2 ,in, figure 1 The scanning electron micrograph of the spherical graphene / polyaniline composite material prepared for Example 1 of the present invention, figure 2 A partially enlarged scanning electron microscope image of the spherical graphene / polyaniline composit...

Embodiment 2

[0059] A graphene aqueous solution with a concentration of 1wt% was spray-dried at 500°C to obtain graphene microspheres, and then 10 g of the obtained graphene microspheres were mixed with 1 g of pyrrole monomer and fully infiltrated to obtain a mixture. The mixture was mixed with Add 0.2g of ammonium persulfate and 0.5g of sodium dodecyl sulfate into 200ml of sulfuric acid solution with a concentration of 5mol / L, and react for 10h under stirring conditions to obtain a reaction product, which is annealed at 100°C to obtain a spherical shape Graphene / polypyrrole composites.

[0060] The electrochemical test of the obtained spherical graphene / polypyrrole composite material shows that the initial specific capacity of the composite material is as high as 950F / g at a current density of 10A / g, and the capacity can still maintain about 95% after 10,000 cycles.

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Abstract

The invention provides a preparation method of a graphene / conductive polymer composite material. The method includes that firstly a graphene solution or a modified graphene solution is subjected to spray drying to obtain a graphene microsphere, then the obtained graphene microsphere is mixed with a liquid conductive polymer monomer to be soaked, then the graphene microsphere is mixed with an acid solution containing an oxidant to be subjected to a polymerization reaction, and the reduction treatment is performed to obtain the graphene / conductive polymer composite material. The composite material is formed by coating a nanoscale conductive polymer on the surface of the graphene microsphere, so that agglomeration of the graphene during large current charge-discharge is avoided, and the rate capability of the composite material during the large current charge-discharge is improved. An experimental result shows that according to the composite material, when the electric current density is 1A / g, the first time discharge capacity reaches to 1000F / g, when the electric current density is 10A / g, the first time discharge capacity is still high and is in a range from 750F / g to 1000F / g, and the specific capacity maintains 90% after 10000 times of circulations.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a graphene / conductive polymer composite material and a preparation method thereof. Background technique [0002] Supercapacitor, also known as electric double layer capacitor, is a new type of energy storage device. It has the characteristics of short charging time, long service life, good temperature characteristics, energy saving and green environmental protection. It has huge potential in electric vehicles and electronic products. Market potential. At present, the electrode material of supercapacitor is mainly activated carbon, which has the advantages of large specific surface area, large capacity, good catalytic performance, stable performance and electrochemical performance. Power density and energy density have been difficult to meet the rapid development of science and technology. [0003] The researchers found that conductive polymers have high capacitance and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02C08G73/06C08G75/02C08K3/04C08K9/00C08K9/04C08L79/02C08L79/04C08L81/02H01G11/30
Inventor 周旭峰曹海亮刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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