Biomass-based doped hard carbon material, preparation method, application and battery

By treating algal biomass with gradient calcination and acid etching, a CNPS quaternary bond structure is formed, which solves the problems of high preparation cost and low heteroatom utilization of hard carbon materials, improves its performance, and realizes the high-value utilization of algal waste.

CN121672476APending Publication Date: 2026-03-17SHANGHAI JIAOTONG UNIV
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Patent Information

Application Number
CN202511859788.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-10
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

Existing hard carbon materials suffer from high production costs, low heteroatom utilization, uneven doping leading to performance fluctuations, and low utilization of algal waste, making it difficult to prepare high-performance carbon materials.

Method used

By employing an in-situ retention and synergistic doping low-temperature interface activation strategy, algal biomass is treated with gradient calcination and acid etching to form a CNPS quaternary bond structure, achieving stable doping of nitrogen, phosphorus, and sulfur, and improving the specific capacity and cycle performance of hard carbon materials.

Benefits of technology

It achieves a balance between high specific capacity, long cycle life, and high rate performance of hard carbon materials, reduces preparation costs, is suitable for large-scale production, and enables high-value utilization of algal waste.

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Abstract

The invention provides a biomass-based doped hard carbon material, a preparation method, application and a battery. The preparation method comprises the following steps: sequentially carrying out gradient calcination on a mixture of an algae precursor and a sulfur source to obtain primary hard carbon; and carrying out acid etching on the primary hard carbon to obtain the porous carbon material. The preparation method provided by the invention not only solves the problems of high cost and low heteroatom utilization rate of the traditional hard carbon raw material, but also realizes the balance of high specific capacity, long cycle and high rate performance through modification synergy, promotes the resource utilization of algae wastes, and has significant economic value and environmental protection significance.
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