Array carbon nano-tube/carbon fiber-based flexible composite electrode material and preparation method thereof

Abstract

The invention discloses an array carbon nano-tube / carbon fiber-based flexible composite electrode material and a preparation method thereof. The composite material takes a three-dimensional carbon fiber woven body as a substrate, a carbon nano-tube array is grown on the substrate, and nano-scale manganese dioxide particles are deposited on the surface. The preparation process comprises the following steps: performing high-temperature treatment on the three-dimensional carbon fiber woven body under the protection of inert gas; wrapping a layer of nano-scale silicon dioxide on the surface of the carbon fiber; using a chemical vapor deposition method to grow the carbon nano-tube array on the surface of the three-dimensional carbon fiber woven body; and utilizing a constant current electrochemical deposition method to uniformly deposit nano-scale manganese dioxide on an array carbon nano-tube / carbon fiber composite body. The process is simple, and the prepared flexible composite electrode has the advantages of developed conductive network, porous structure, large specific surface area, higher utilization rate of active substances, excellent mechanical strength and excellent chemical stability, thus the composite material provided by the invention is an ideal material for the high-performance large-capacity supercapacitor flexible electrode.

Description

technical field [0001] The invention relates to an array carbon nanotube / carbon fiber-based flexible composite electrode material and a preparation method thereof, belonging to energy storage material technology. Background technique [0002] With the development of science and technology and society, many occasions such as electric vehicles, instant power supply, mobile communication, national defense and military industry have greatly increased the power requirements, which have far exceeded the capacity of the battery. Although traditional capacitors can provide very large power, their energy density is extremely limited and cannot meet actual needs. As a new type of energy storage device between batteries and traditional dielectric capacitors, supercapacitors have the characteristics of short charging time, long service life, good temperature characteristics, energy saving and environmental protection, making them have both high specific energy and High specific power c...

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Problems solved by technology

However, it is difficult to get rid of some inherent defects in the application of this activated carbon electrode in supercapacitors: since the activated carbon electrode is a microporous material, its pore size is less than 2 nm (Huang CW, Chuang CM, Ting JM, et al. Significantly enhanced charge conduction in electric double layer capacitors using carbon nanotube-grafted activated carbon electrodes. J Power Sources. 2008;183(1):406-10.), this narrow gap will create a large obstacle when the electrolyte particles are inserted into and out of the electrode, Especially at high current density, the transmission resistance of the electrode increases, which affects the rate performance of the supercapacitor, and its power characteristics and frequency response characteristics are not good; on the other hand, the activated carbon material itself is a non-graphite The material of the structure has low conductivity, and the active material used as the electrode of the supercapacitor has a large internal resistance, which reduces the performance of the capacitor

However, there are no reports or patents related to the preparation of arrayed carbon nanotubes / carbon fiber-based flexible composite electrode materials and their capacitive properties.

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