Regenerated graphite negative electrode material, negative electrode, regenerated graphite negative electrode material regeneration method and application

By employing water washing and filtration, heavy liquid separation, and dynamic heat treatment processes, the problems of low efficiency and environmental pollution in the recycling of lithium-ion battery anode sheets have been solved, and high-performance recycled graphite anode materials have been prepared, thus resolving the environmental and performance damage issues of the traditional acid leaching method.

CN122355285APending Publication Date: 2026-07-10HUNAN CHMM-SUNWARDS NEW MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN CHMM-SUNWARDS NEW MATERIAL CO LTD
Filing Date
2026-04-28
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies suffer from low efficiency, high energy consumption, and poor regeneration performance when recycling lithium-ion battery anode sheets. Furthermore, traditional acid leaching methods for graphite recycling pose risks of environmental pollution and performance damage.

Method used

High-temperature regenerated graphite anode material was prepared by using water washing and pressure filtration, heavy liquid separation and dynamic heat treatment processes, separating metal and graphite through lithium heteropolytungstate heavy liquid, combined with polycyclic aromatic hydrocarbon remediation agent and dynamic heat treatment.

Benefits of technology

This method achieves efficient removal of metallic impurities, repairs graphite surface defects, improves the first charge-discharge efficiency and density of graphite, reduces environmental pollution risks, and yields high-performance recycled graphite anode materials.

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Abstract

This invention relates to the field of graphite anode material recycling and resource reuse technology, specifically to a regenerated graphite anode material, an anode, a method for regenerating the regenerated graphite anode material, and its application. The method involves washing, filtration, and heavy liquid separation of the recovered anode raw material. First, water washing removes most of the adhesive residue, such as CMC. Then, heavy liquid separation is used to obtain low-metal-element graphite powder, which is particularly beneficial for removing small-particle metals adhering to the graphite powder. The heavy liquid can be recycled. Then, based on continuous graphitization at high temperatures, non-carbon impurities are discharged, and carbon microcrystals are rearranged. This remediation process avoids the waste liquid generated during acid leaching purification and solves many problems caused by surface microcrystalline structure defects in graphite recovered by acid leaching, such as low initial efficiency and low tap density.
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Citation Information

Patent Citations

  • Method for regenerating waste and old graphite anode materials

    CN102544629A

  • Regeneration method of graphite anode of lithium ion battery

    CN104638316A

  • A method for recycling graphite anode sheets from waste lithium-ion batteries

    CN105304967B