Mesopore-micropore carbon micro sphere of high specific surface area for super capacitor and preparation method of carbon micro sphere

Abstract

The invention relates to a mesopore-micropore carbon micro sphere of high specific surface area for a super capacitor and a preparation method of the carbon micro sphere. A polystyrene micro sphere is prepared by using styrene as a monomer, SBA-15 as a mesopore template and ammonium polyphosphate as a multifunctional auxiliary agent; and the polystyrene micro sphere is crosslinked, carbonized and etched to obtain the polystyrene-based mesopore-micropore carbon micro sphere of the high specific surface area. The preparation method is characterized in that the ammonium polyphosphate serves as the multifunctional auxiliary agent, acid and alkali activation is not needed, and the N and P codoped mesopore-micropore carbon micro sphere of the high high specific surface area for the super capacitor can be obtained; the specific surface area of the material is 1168-1476m2 / g, the pore volume is 1.069-1.341m3 / g, and when the mesopore-micropore carbon micro sphere is used as the electrode material of the super capacitor, the specific capacitance in a water system electrolyte is 132.5-175F / g; and the mesopore-micropore carbon micro sphere is very suitable for serving as the electrode material of the super capacitor.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a high specific surface area mesoporous-microporous carbon microsphere for a supercapacitor and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage device between traditional capacitors and batteries. It has high power density, high energy density, fast charge and discharge speed, long cycle life, no pollution to the environment, wide operating temperature range and high safety performance. In recent years, it has attracted worldwide attention and has become one of the research hotspots in the field of new energy. The electrode material is one of the key factors determining the performance of supercapacitors, so the synthesis and optimization of high-performance electrode materials is the focus of supercapacitor research. The mesoporous-microporous carbon material, as a carbon material widely used in supercapac...

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Problems solved by technology

[0003] At present, the existing microporous carbon materials are mostly activated by strong acid and strong alkali. However, strong acid and strong alkali will cause great corrosion to the equipment, which will affect the service life of the equipment, increase the production cost, and also increase the risk factor.

[0004] Chinese patent CN103159886A discloses a preparation method of ultra-high specific surface area monodisperse polymer microspheres, using soap-free miniemulsion polymerization to prepare slightly crosslinked monodisperse prepolymer microspheres, and then using The methyl group undergoes Friedel-Crafts reaction for further cross-linking to obtain monodisperse polystyrene microspheres with a specific surface area up to 1255m 2 / g, the pore volume can reach 0.78cm 3 / g, but the specific surface area and pore volume are still low, without nitrogen and phosphorus doping, which is not conducive to the improvement of its capacitance performance

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