A preparation method of a chemical treatment of a biomass precursor to regulate hard carbon structure for use as a negative electrode material of a sodium ion battery

By chemically treating biomass precursors to regulate the hard carbon structure, and pretreating biomass materials with solutions such as ZnCl2, AlCl3, LiCl, and CaCl2, combined with a one-step high-temperature carbonization method, the problem of unsatisfactory capacity and rate performance of hard carbon anode materials for sodium-ion batteries was solved. This enabled the preparation of hard carbon materials with high capacity and high rate performance, simplifying the process and reducing costs.

CN120646803BActive Publication Date: 2026-07-21CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Filing Date
2025-05-28
Publication Date
2026-07-21

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Abstract

The application belongs to the field of sodium ion secondary batteries, and particularly relates to a preparation method of a chemical treatment biomass precursor for regulating hard carbon structure used as a negative electrode material of a sodium ion battery. First, the biomass is pretreated by washing, drying and the like to remove surface impurities, then a pretreated material is obtained by using a chemical treatment method, and finally a hard carbon material with good stability is obtained by high-temperature carbonization in a nitrogen atmosphere. ‑1 The prepared hard carbon material has a high specific capacity, and the maximum specific capacity can reach 365 mAh g ‑1 Above, after 2000 cycles at a current density of 1 A g ‑1 The capacity retention rate is still maintained above 89%. In addition, the application uses biomass as a precursor, raw materials are easy to obtain, the cost is low, the preparation process is simple and easy to implement, and the efficiency is high, and comprehensive utilization of biomass waste is realized.
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