Graphene/conductive polymer composite material and preparation method thereof

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 ...

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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.

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