S-N co-doped porous carbon material and preparation method and application thereof

By preparing SN co-doped porous carbon materials, the problems of adsorption capacity and diffusion kinetics of sodium ion mixed capacitor anode materials were solved, realizing high-performance sodium ion storage and improving energy and power density.

CN121778701APending Publication Date: 2026-04-03PINGDINGSHAN UNIVERSITY
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Patent Information

Application Number
CN202610084753.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-22
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

Existing sodium-ion hybrid capacitor (SIHC) anode materials suffer from weak sodium ion adsorption capacity, slow diffusion kinetics, and poor cycle stability, making it difficult to achieve both energy density and power density.

Method used

A method for preparing porous carbon materials using SN co-doping was adopted. Sodium gallate was used as a precursor and co-doped with thiourea to construct porous carbon materials with rich microporous structures and multiple active sites, thereby enhancing the adsorption capacity and diffusion performance of sodium ions.

Benefits of technology

This significantly improved the specific capacity and rate performance of the anode material, enabling high-capacity, high-rate, and long-cycle sodium-ion storage, and constructing a high-performance all-carbon sodium-ion hybrid capacitor.

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Abstract

The invention discloses an S-N co-doped porous carbon material as well as a preparation method and application thereof. The preparation method comprises the following steps: A1, synthesizing a porous carbon material GN; a2, preparation of an S-N co-doped material SNGN; weighing GN and an S-N doping source according to a certain mass ratio, grinding and mixing to be uniform; transferring the mixed powder into a calcining furnace, heating to 750-800 DEG C at a certain heating rate in a nitrogen atmosphere, and keeping the temperature; and naturally cooling, washing the product with a hydrochloric acid solution, washing with deionized water until the product is neutral, and carrying out vacuum drying to obtain the S-N co-doped porous carbon material marked as SNGN. Through an S-N co-doping strategy, a porous carbon material (SNGN-1) with a rich microporous structure and multiple active sites is constructed, the adsorption capacity of Na is remarkably enhanced, the specific capacity and the rate capability of a negative electrode material are improved, and then construction of the high-performance all-carbon sodium ion hybrid capacitor is achieved.
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