Preparation method of hard carbon material, hard carbon material and sodium ion battery

The multi-branched chain glycan-based hard carbon material prepared by enzymatic lysis and multiple sintering and carbonization solves the problems of existing hard carbon materials in sodium ion battery applications, and achieves high capacity, high efficiency and environmentally friendly hard carbon material preparation.

CN116477604BActive Publication Date: 2025-03-28GUANGDONG KAIJIN NEW ENERGY TECH CORP LTD
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Patent Information

Application Number
CN202310526582.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-10
Publication Date
2025-03-28
Estimated Expiration
2043-05-10

AI Technical Summary

Technical Problem

In the application of sodium ion battery, existing hard carbon materials have problems such as small capacity, low charging efficiency, poor mechanical performance, and are not environmentally friendly and have high cost.

Method used

Multi-branched chain glycans are used as raw materials to prepare hard char material through enzymatic decomposition and multiple sintering and carbonization, and ammonium salt is added during the preparation process to improve reversible capacity and conductivity.

Benefits of technology

The prepared hard carbon material has a small particle size and specific surface area, a high first-time reversible capacity, charging efficiency and conductivity. It is suitable for sodium ion battery negative electrode materials, and is environmentally friendly and has low cost.

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Abstract

The present invention relates to the technical field of material preparation, and discloses a method for preparing a hard carbon material, a hard carbon material and a sodium ion battery. The method for preparing a hard carbon material comprises the following steps: (I) enzymatically hydrolyzing a polysaccharide with multiple branches under the action of an enzyme, and performing a first sintering and then pulverizing to obtain a precursor; (II) mixing the precursor and an ammonium salt solution, drying, and performing a second sintering to obtain a fired material; (III) carbonizing the fired material. The hard carbon material comprises a hard carbon core and a conductive film coating the hard carbon core. The hard carbon material has a relatively small particle size and specific surface area, a relatively high first reversible capacity, a relatively high first charging efficiency and a relatively high electrical conductivity, and is particularly suitable for use as a negative electrode material for sodium ion batteries.
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