Preparation method of flexible porous carbon fiber

Abstract

The invention relates to a preparation method of a flexible porous carbon fiber. The method comprises the following steps that plant cellulose lines with the diameter of 0.1-2000 micrometers are thoroughly cleaned and dried; 2, the plant cellulose lines processed in the step 1 are subjected to heat treatment at 700-1500 DEG C for 1-300 min in the reducing atmosphere, and therefore the flexible porous carbon fiber is obtained. No catalyst or solvent needs to be used, the method is easy to implement and suitable for large-scale continuous production, and the obtained flexible porous carbon fiber has the good flexibility and can be bent by 360 degrees; the internal structure of the flexible porous carbon fiber has the quite high degree of graphitization, a large number of crystal lattice fringes can be seen under high resolution, and the specific surface area is quite high and can reach up to 1362 m<2> / g.

Description

technical field [0001] The invention relates to a method for preparing flexible porous carbon fibers, which belongs to the technical field of inorganic nanometer material preparation. Background technique [0002] Supercapacitors, especially electric double layer supercapacitors based on carbon materials, have ultra-high energy density compared with other capacitors, one to two orders of magnitude higher power density than traditional batteries, and can reach tens of thousands of cycles. It is considered to be an energy storage device that can partially replace or even completely replace traditional batteries in the future, and has broad application prospects in various electronic devices, recyclable energy storage systems, and new energy vehicles. The common supercapacitors are mainly planar structures, which are composed of two layers of metal substrates as current collectors, two layers of thin film electrode materials, one layer of separator and electrolyte. They are us...

AI Technical Summary

Problems solved by technology

The current porous carbon fibers are mainly prepared by three cumbersome methods. One is to prepare polymer nano or micron wires by electrospinning and other technologies, and then process them at high temperatures to obtain porous carbon fibers. This method takes a long time and has a high yield. Very low, and electrospinning technology requires high voltage

The second is to prepare or purchase carbon nanotubes, graphene, etc., and use dry drawing, wet spinning and other methods to weave porous carbon fibers. This method can prepare porous carbon fibers with a relatively large area, but the required carbon The preparation process of nanotubes, graphene and other materials is complex and costly, and requires professional spinning equipment to prepare them into fibers, which also greatly increases the cost of preparation

The third method is to use chemical methods to peel off the industrially produced carbon fibers to a certain extent to form a porous structure on the surface. The carbon fibers prepared by this method have good tensile strength and toughness, but their specific surface area is still relatively low. , at the same time, the sulfuric acid potassium permanganate solution used in the stripping process is highly corrosive, which increases the difficulty and danger of the operation, and is not conducive to environmental protection

However, the preparation process of the above-mentioned method is complicated and the cost is relatively high.

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