Composite nanometer carbon paper and preparation method thereof

Abstract

The invention discloses composite nanometer carbon paper and a preparation method thereof. The nanometer carbon paper uses carbon nanometer paper as a framework network, MnO2 metallic oxides are deposited on the surface, the outer layer is covered with grapheme, and the composite nanometer carbon paper belongs to a flexible composite film material. The preparation method of the composite nanometer carbon paper comprises the steps that carbon nanometer tubes are dispersed in a solvent, then, the suction filtering is carried out to obtain carbon nanometer tube paper, next, the carbon nanometer tube paper is used as a carrier for depositing the MnO2 metallic oxides on the surface, and finally, the grapheme is adhered on the product surface to obtain target products. The electrical conductivity, the heavy current charging and discharging capability, the specific capacitance and the cycle life of the composite nanometer carbon paper are respectively and obviously enhanced through being compared with those of the carbon nanometer tube-MnO2, the problems that in the existing super capacitor, the metallic oxides easily fall off from the surface of the carbon nanometer tubes, the electrical conductivity of the metallic oxides is poor, and the like are solved, the composite nanometer carbon paper also has the characteristics of light weight and flexibility of materials and high efficiency, simultaneously, the preparation process is simple, the operation is easy, the controllability is good, and in addition, the cost is low. The composite nanometer carbon paper and the preparation method have wide application prospects in fields of new energy sources, advanced chemical engineering, electronic devices, film preparation and the like.

Description

technical field [0001] The present invention particularly relates to a kind of by carbon nanotube, MnO 2 The invention relates to a sandwich-type composite nano-carbon paper formed by compounding with graphene and a preparation method thereof, belonging to the technical field of nano-carbon material preparation. Background technique [0002] Supercapacitors, especially lightweight flexible capacitors, are currently a research hotspot in the energy field, and their electrode materials are divided into carbon materials, transition metal oxide materials and conductive polymer materials. As electrodes, carbon materials have high power density and long cycle life; metal oxides and conductive polymers have high specific capacitance, but low power density. In addition, the active material is likely to fall off due to the volume change during work, so that the cycle life of the material is not high. [0003] In order to overcome the shortcomings of traditional technologies, resear...

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Problems solved by technology

As electrodes, carbon materials have high power density and long cycle life; metal oxides and conductive polymers have high specific capacitance, but low power density

In addition, the active material is likely to fall off due to volume changes during work, which makes the cycle life of the material not high

[0003] In order to overcome the shortcomings of traditional technologies, researchers have developed a scheme of using carbon nanotube powder and other materials to form composite materials with metal oxides, which can greatly improve the capacitance performance of metal oxides, but the composite materials prepared It cannot meet the requirements of light weight, flexibility and high efficiency of materials, the maximum operating current is small, and the power density is still very low, and it cannot meet the requirements of high-power and high-current operation of supercapacitors, and the conductivity of metal oxides far away from carbon nanotubes in composite materials is still very low. In addition, the phenomenon of reduced cycle life caused by the shedding of active materials, which is common in metal oxides, has not been well resolved.

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