A kind of high specific surface area mesoporous-microporous carbon microsphere for supercapacitor and preparation method thereof

Abstract

A high specific surface area mesoporous-microporous carbon microsphere for a supercapacitor and a preparation method thereof, belonging to the field of material technology, using styrene as a monomer, SBA-15 as a mesoporous templating agent and ammonium polyphosphate as a multifunctional additive Preparation of polystyrene microspheres; then cross-linking, carbonization and etching of polystyrene microspheres to obtain polystyrene-based mesoporous-microporous carbon microspheres with high specific surface area. The preparation method is characterized in that ammonium polyphosphate is used as a multifunctional auxiliary agent, and mesoporous-microporous carbon microspheres with high specific surface area and N and P co-doped for supercapacitors can be obtained without acid-base activation. The specific surface area of ​​the obtained material is 1168-1476m2 / g, and the pore volume is 1.069-1.341cm3 / g. When mesoporous-microporous carbon microspheres are used as supercapacitor electrode materials, the specific capacitance obtained in the aqueous electrolyte is 132.5 ~175.6F / g. This is very suitable for electrode materials for supercapacitors.

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 CN 103159886 A discloses a method for preparing monodisperse polymer microspheres with ultra-high specific surface area, using soap-free miniemulsion polymerization to prepare slightly crosslinked monodisperse prepolymer microspheres, and then using the Chloromethylene was further cross-linked by Friedel-Crafts reaction 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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