Preparation method and application of asphalt-coated lignin-derived hard carbon

By using limonene to dissolve and disperse asphalt, the problems of agglomeration and uneven coating in the preparation process of hard carbon materials were solved, and the performance of high-efficiency sodium-ion battery anode materials was improved, which has good prospects for engineering applications.

CN122212092APending Publication Date: 2026-06-16HARBIN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN UNIV OF SCI & TECH
Filing Date
2026-04-23
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

In existing technologies, when asphalt is used as a carbon source to prepare hard carbon materials, there are problems such as agglomeration, uneven coating or local phase separation, which leads to random pore structure, loose interface and uncontrolled defect distribution, affecting its performance as a negative electrode material for sodium-ion batteries.

Method used

Using limonene as a medium solvent, asphalt is dissolved and dispersed under mild conditions, so that it is uniformly coated on the surface of lignin particles, forming a composite precursor with continuous structure and stable interface. Through heat treatment, microphase separation and interface vacancies are induced to form a controllable microporous and mesoporous structure.

Benefits of technology

The prepared pitch-coated lignin-derived hard carbon material exhibits high initial coulombic efficiency and good rate performance as a negative electrode material for sodium-ion batteries. The initial coulombic efficiency is 81.76%, and the capacity retention rate at 3C is 75.05%. It has the advantages of simple process, strong scalability and controllable cost.

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Abstract

The application relates to a preparation method and application of asphalt-coated lignin-derived hard carbon, and relates to a preparation method and application of hard carbon.The application aims to solve the problems that, when asphalt is used as a carbon source to prepare hard carbon materials, agglomeration, uneven coating or local phase separation exist, which is not conducive to the construction of a stable and controllable composite precursor structure, and leads to the problems that, when the hard carbon is used as a negative electrode material of a sodium ion battery, a random pore structure exists, an interface is loose, and defect distribution is out of control.The application introduces limonene to realize effective dissolution and migration of asphalt under mild conditions, constructs a high-quality lignin-asphalt composite system, can form a structure continuous and interface stable composite precursor, constructs a controllable microporous and mesoporous structure in the carbonization stage, and provides stable and efficient sodium storage sites for the hard carbon.The application not only improves the structural uniformity and electrochemical performance of the hard carbon negative electrode material, but also has the advantages of simple process, strong scalability, controllable cost and the like, and has a good engineering application prospect.
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