Method for constructing hard carbon from oily biomass and application

By extracting oil from biomass, a multi-factor system with edge defects as its core is formed, which solves the problem of oil affecting the electrochemical performance of hard carbon materials and achieves efficient sodium ion storage and excellent rate performance.

CN121735241APending Publication Date: 2026-03-27QILU UNIVERSITY OF TECHNOLOGY (SHANDONG ACADEMY OF SCIENCES)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-29
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

Existing technologies have failed to fully explore the core value of small-molecule oils in biomass in the preparation of hard carbon materials, resulting in the oil components affecting the electrochemical performance of materials during high-temperature carbonization. There is a lack of systematic research on how to precisely control the microcrystal evolution and pore formation during the carbonization process by regulating the degreasing treatment of oily biomass.

Method used

By extracting oily biomass to remove small oil molecules, and utilizing the molecular-level vacancies left after fatty acid removal to inhibit excessive orientation stacking of carbon layers during high-temperature carbonization, a multi-dimensional defect system with edge defects as the core is directionally induced to form a hard carbon material with high sodium storage active sites is constructed.

Benefits of technology

This study achieved efficient sodium ion storage in hard carbon materials, improving the rate performance and cycle life of the materials. At the same time, it reduced the diffusion barrier of sodium ions inside the carbon skeleton, and constructed a continuous ion transport channel and electron conduction network.

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Abstract

The invention belongs to the technical field of energy storage materials and batteries, and particularly relates to a method for constructing hard carbon from oily biomass and application. The method comprises the following steps: crushing oil-containing biomass, carrying out steam puffing treatment, and then drying to obtain a puffed oil-containing biomass material; performing grease extraction treatment on the puffed oil-containing biomass material to obtain deoiled biomass; performing high-temperature carbonization under an inert gas condition to obtain a carbonized material; pickling the carbonized material with a dilute acid solution, then washing with deionized water until the solution is neutral, and drying to obtain the biomass-based hard carbon. The oil-containing biomass is subjected to extraction treatment to remove a certain amount of grease small molecules, molecular-level vacancies left after fatty acid is removed inhibit over-oriented stacking of a carbon layer along a 002 crystal face through a steric hindrance effect in a high-temperature carbonization process, a multi-element defect system with an edge defect as a core is formed through directional induction, and a multi-element defect system with the edge defect as a core is formed. And an additional active sodium storage site is introduced, so that the hard carbon negative electrode material with the high sodium storage active site is prepared.
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Citation Information

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