Preparation method and application of porous carbon material

Abstract

The invention provides a preparation method of a porous carbon material. The method comprises the following steps of (1) soaking cellulose fiber into 5-40wt% of zinc chloride solution for 30-60min andpartially dissolving the surface of the cellulose fiber; (2) solidifying the cellulose fiber in deionized water for a moment and then putting a product into a drying device for drying; and (3) and carrying out carbonization by adopting argon as a protective atmosphere. The invention provides a simple and feasible brand-new technique, namely a selective surface dissolution method for the first time. The cellulose fiber is subjected to pretreatment and then subjected to high-temperature carbonization, optimum process parameters are obtained through researching the influences of various processparameters on a pore structure and electrochemical properties, the porous activated carbon material with large specific surface area and an abundant pore structure is prepared, the porous activated carbon material is prepared into a supercapacitor as an independent electrode material (without adding a conductive agent or a binder), and the specific capacitance of the supercapacitor can reach 488F / g and is much higher than that of an existing similar supercapacitor, so that the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a preparation method and application of a porous carbon material. Background technique [0002] As an energy storage device with excellent performance, supercapacitors have received more and more attention, and have been used in new energy vehicles, rail transit charging equipment, portable electronic products, etc. Activated carbon is the most widely used electrode material for supercapacitors. It has the advantages of light weight, wide range of sources, low price, large specific surface area, and good conductivity. [0003] The specific surface area and pore structure of supercapacitor electrode materials are the main factors affecting the electrochemical performance of capacitors. The existing activated carbon pore structure is relatively single (mainly micropores), although its specific surface area is not small (1400m 2 / g), but a large number of mi...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned problems of high cost of preparation process of existing activated carbon materials, environmental pollution, single pore structure, and low specific capacitance of supercapacitors prepared as electrode materials, the present invention provides a method for preparing porous carbon materials, which uses selective surface for the first time Pretreatment before carbonization by dissolution method to prepare a porous activated carbon material with large specific surface area and rich pore structure, which can be used as an independent electrode material (without adding conductive agent and binder) to prepare a supercapacitor, and the specific capacitance can reach 488F / g

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