Preparation method of nitrogen-doped carbon skeleton-anchored bismuth nanoflower electrode material and application thereof in sodium ion battery negative electrode

By preparing nitrogen-doped carbon framework anchored bismuth nanoflower electrode materials, the problems of low capacity and energy density of sodium-ion battery anode materials were solved, achieving high-efficiency electrochemical performance and low-cost electrode material preparation.

CN116275077BActive Publication Date: 2026-06-30TAIYUAN UNIVERSITY OF TECHNOLOGY
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Patent Information

Application Number
CN202310294408.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-17
Publication Date
2026-06-30
Estimated Expiration
2043-03-17

AI Technical Summary

Technical Problem

Existing sodium-ion battery anode materials have drawbacks such as low theoretical capacity, low initial charge-discharge efficiency, and low energy density, which limit the development of sodium-ion batteries.

Method used

Using coal tar pitch as a carbon framework precursor material and metallic bismuth as an electrode active material, and utilizing recyclable metal salts as templates, nitrogen-doped carbon framework-anchored bismuth nanoflower electrode materials are constructed through solvothermal and high-temperature carbonization methods. This achieves controllable structure, low cost, and high efficiency, and the salt templates can be recycled and reused repeatedly.

Benefits of technology

The prepared electrode material exhibits excellent electrochemical performance, exposes more active sites, avoids the aggregation of active materials, and improves conductivity and sodium ion adsorption capacity, making it suitable for sodium-ion battery anodes.

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Abstract

This invention discloses a method for preparing a nitrogen-doped carbon framework-anchored bismuth nanoflower electrode material and its application in sodium-ion battery anodes. Using coal tar pitch as the carbon framework precursor material and metallic bismuth as the active electrode material, a nitrogen-doped carbon framework-anchored bismuth nanoflower electrode is constructed using a recyclable metal salt as a template via solvothermal and high-temperature carbonization methods. In this electrode material, the metallic bismuth microstructure exhibits a nanoflower-like structure, while the nitrogen-doped amorphous carbon forms a three-dimensional framework structure, with the metallic bismuth nanoflowers uniformly dispersed and anchored on the carbon framework. The electrode material prepared by this method possesses excellent performance, controllable structure, high operational efficiency, low cost, and recyclable salt templates, demonstrating broad application prospects. This invention can be applied to the preparation of sodium-ion battery anode materials.
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