Composite type activated carbon electrode material for super capacitor

Abstract

The invention discloses a novel composite type activated carbon electrode material. The material is prepared by the method comprising the following steps: grinding micron activated carbon with the average particle size being 5-20 mu m to obtain submicron activated carbon with the average particle size being 1-0.5 mu m by adopting high-pressure overheated steam; mixing the obtained submicron activated carbon with carbon nano tube dispersing slurry at high speed according to the mass ratio of (1-5):100; then carrying out spray drying treatment to obtain submicron activated carbon granules woundby a carbon nano tube; and finally calcining the submicron activated carbon granules wound by the carbon nano tube in a protective atmosphere of 800-900 DEG C to obtain the composite micron activatedcarbon electrode material. According to the invention, the existing micron activated carbon material can be ground and refined into submicron activated carbon material and a carbonized pore volume structure on the fresh surface is activated, then the carbon nano tube is wrapped and wound, and finally the material is prepared by carrying out a high-temperature calcination and the adhesion. The material can ensure that the carbonized pore volume surface in the interior of the activated carbon can be used at a limit state, so that the final electricity-storing effect can be improved by dozens ofor a hundred times.

Description

technical field [0001] The invention belongs to the field of supercapacitors, and in particular relates to a capacitor electrode material for a supercapacitor, that is, a novel composite activated carbon electrode material. Background technique [0002] A supercapacitor is a very large capacitor with a capacitance of thousands of farads. Take the super capacitor of Cooper Cooper Company of the United States as an example. According to the principle of the capacitor, the capacitance depends on the distance between the electrodes and the surface area of ​​the electrodes. In order to obtain such a large capacitance, it is necessary to reduce the distance between the electrodes of the super capacitor and increase the surface area of ​​the electrodes. To this end, the principle of an electric double layer and porous activated carbon electrodes are used. [0003] When a voltage is applied to the two electrodes of the supercapacitor electric double layer medium, a charge opposite ...

AI Technical Summary

Problems solved by technology

There are also sub-micron (below 1 micron) activated carbon particles on the market. There are two problems with the use of such sub-micron activated carbon particles as electrode materials. One is that the unit volume density can reach If not, the effect of high-efficiency energy storage cannot be achieved. If the space between the submicron particle interfaces is too small after high-pressure tableting, it is not conducive to the penetration of the dielectric fluid and affects the introduction of the charge to be stored; the second is At present, the submicron-sized activated carbon particles on the market are all made by wet media grinding. In the process of processing, the micron-sized particles are broken into sub-micron particles. Most of the uneven carbonized pore volume is destroyed, and the submicron-sized activated carbon particles cannot achieve the effect of super energy storage.

Therefore, the porosity of activated carbon in the prior art has not been used in the limit state, which limits the performance of this type of supercapacitor

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