A residue-derived hard carbon anode material, its preparation method and a lithium-ion battery

The method of low-temperature pyrolysis and high-temperature catalytic carbonization with surface modification addresses the inefficiencies of existing hard carbon negative electrodes, producing a nitrogen-doped, lithium-rich material with improved performance for lithium ion batteries.

CN118373404BActive Publication Date: 2025-07-15CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Application Number
CN202410463800.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-04-17
Publication Date
2025-07-15
Estimated Expiration
2044-04-17

AI Technical Summary

Technical Problem

The first-circle Coulomb efficiency and long-cycle stability of existing hard carbon anode materials are insufficient, the rate performance is poor, and the complex post-processing technology is costly, making it difficult to meet the needs of commercial applications.

Method used

The preparation method of residual oil-derived hard carbon negative electrode material includes low-temperature cracking and coking, catalytic pyrolysis of transition metal salts and organic lithium salt modification to form a defect-free and lithium-rich carbon matrix on the surface, regulate the pore structure, and realize a fast conductive network and lithium ion path.

Benefits of technology

It improves the first Coulomb efficiency, cycle stability and rate performance of hard carbon anode materials, reduces production costs, provides an efficient way to utilize residual oil, and improves the electrochemical performance of lithium-ion batteries.

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Abstract

The present invention provides a residue-derived hard carbon anode material, a preparation method thereof, and a lithium-ion battery. Wherein, the preparation method includes: using vacuum residue as a raw material, performing low-temperature cracking and coking in a nitrogen-containing atmosphere to obtain a nitrogen-containing coke precursor; under the catalytic action of an external catalyst, subjecting the nitrogen-containing coke precursor to high-temperature catalytic pyrolysis, cross-linking, and polycondensation reactions to obtain a carbon precursor material; infiltrating the carbon precursor material into an organic solution containing an organic lithium salt and then adding an anion source to perform surface modification on it to obtain the residue-derived hard carbon anode material. Using the residue-derived hard carbon anode material provided by the present invention as the anode material of a lithium-ion battery, it has excellent performance and exhibits high-capacity, high first Coulomb efficiency, high-rate, and long-cycle electrochemical performance.
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