Macro preparation method of micropore-rich nitrogen-doped yolk-eggshell structure carbon microspheres

Abstract

The invention relates to a macro preparation method of micropore-rich nitrogen-doped yolk-eggshell structure carbon microspheres. The macro preparation method comprises the following steps: 1) dissolving a phenol source in deionized water, adjusting the solution to be weakly alkaline, adding organosilane for hydrolysis to obtain an organosilicone core, then adding an aldehyde source for condensation polymerization to form a coating shell layer, centrifuging, washing and drying to obtain organosilicone-phenolic resin core-shell structure microspheres; and 2) carbonizing the product in the step1) in an inert atmosphere, removing the silicon template, and activating to obtain the micropore-rich nitrogen-doped yolk-eggshell structure carbon microspheres. Compared with the prior art, the method has the following advantages: the synthesis process is simple and green, and the cost is low; the obtained carbon microspheres have high micropore content and high carbon residue and are suitable for industrial application; the pore size distribution of the carbon microspheres is highly matched with the ion size of the EMIMBF4 electrolyte, and the electrode / electrolyte system shows high specificcapacity, high energy density and excellent rate capability when being applied to a supercapacitor.

Description

technical field

[0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a method for macro-preparing microporous nitrogen-doped egg yolk@eggshell structured carbon microspheres that can be applied to supercapacitor electrode materials. Background technique

[0002] Porous carbon is a common industrial raw material, widely used as supercapacitor electrode material and secondary battery anode material. As an electrode material for supercapacitors, in addition to the advantages of adjustable morphology, good conductivity, good stability, high power density, and low cost, porous carbon also has a fatal shortcoming: low energy density. Improving the energy density of supercapacitors can start from two aspects: increasing the specific capacity of porous carbon materials and increasing the voltage window: increasing the specific capacity of porous carbon materials can be achieved from four aspects: increasing the specific surface ar...

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