Nitrogen-rich doped porous structural carbon material and preparation method and application thereof

Abstract

The invention provides a nitrogen-rich doped porous structural carbon material which is prepared by mixing water soluble phenolic resin, a surfactant F127 and guanine by a solvent evaporation self assembly method. The preparation method comprises the steps: (1) obtaining a nitrogen-containing precursor from the surfactant F127, guanine and the water soluble phenolic resin through the evaporation self-assembly process; (2) carrying out pyrolysis of the nitrogen-containing precursor to obtain nitrogen-rich doped modified porous carbon material; and (3) washing the obtained porous carbon material, filtering, and drying to obtain the nitrogen-rich doped porous structural carbon material. With an application of the material as a negative electrode material for a lithium ion battery, when the current density is 100 mA*g<-1>, the specific capacity value is 607 mAh*g<-1>; with an application of the material as a super capacitor material, when the current density is 0.5 A*g<-1>, the specific capacitance is 218 F*g<-1>. The prepared carbon material has the advantages of large specific surface area, excellent electrochemical performance, simple preparation process and easy mass production, and has wide application prospects in electrochemistry and other fields.

Description

technical field [0001] The invention relates to the technical field of porous materials, in particular to a nitrogen-rich doped porous structure carbon material and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used in various daily energy storage components due to their high energy density, fast charging and discharging, easy portability, and high voltage compared to dry batteries. As an important lithium storage body of lithium-ion batteries, the negative electrode material is prone to collapse with the intercalation and extraction of lithium ions during the charging and discharging process, resulting in continuous attenuation of capacity, reducing the original service life of lithium-ion batteries, and greatly limiting its capacity. applications in large-scale energy storage. As an important part of lithium-ion battery electrode materials, carbon materials have aroused widespread interest among researchers due to t...

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Problems solved by technology

[0012] The purpose of the present invention is to improve the problem of limited specific capacity and cycle instability of the negative electrode material by increasing the nitrogen content and specific surface area of ​​the negative electrode material of the battery, and at the same time solve the problem that the preparation process of the current high-capacity negative electrode material is complicated and difficult to produce on a large scale. Proposed a nitrogen-rich doped porous carbon material and its preparation method and application

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