A positive electrode binder and a lithium ion battery positive electrode and a lithium ion battery using the same

CN116445109BActive Publication Date: 2026-02-27HUIZHOU EVE POWER CO LTD
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Patent Information

Application Number
CN202310140977.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-02-21
Publication Date
2026-02-27
Estimated Expiration
2043-02-21

AI Technical Summary

Technical Problem

Existing lithium-ion battery cathode binders have poor alkali resistance and are prone to gelation in ternary battery systems. Furthermore, fluorinated monomers are expensive, making it difficult to reduce the cost of electrode binders. Additionally, active materials are prone to detachment during battery production and use.

Method used

A positive electrode binder is prepared by emulsion polymerization of fluorinated acrylate monomers and non-fluorinated monomers. The appropriate mass ratio is fluorinated acrylate monomers: non-fluorinated monomers = 1~2: 1~5. Combined with appropriate polymerization temperature and reaction conditions, a positive electrode binder with high adhesion, stability and good electrical properties is formed.

Benefits of technology

It reduces the cost of using positive electrode binders, improves the lithium-ion transport kinetics and structural stability of lithium-ion battery positive electrodes, extends the cycle life of batteries, and avoids powder shedding and peeling of the positive electrode active coating.

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Abstract

The application provides a positive electrode binder and a lithium ion battery positive electrode and a lithium ion battery applying the same, raw materials for preparing the positive electrode binder include fluorine-containing acrylic monomers and non-fluorine monomers, the non-fluorine monomers include at least one of acrylonitrile, acrylic ester and acrylamide, the fluorine-containing acrylic monomers: non-fluorine monomers = 1-2: 1-5 in terms of mass ratio; the positive electrode binder is prepared by emulsion polymerization of the fluorine-containing acrylic monomers and the non-fluorine monomers, and the reaction temperature of the emulsion polymerization is 40-90 DEG C. The application realizes chemical blending of the fluorine-containing monomers and the non-fluorine monomers by copolymerization, can simultaneously exert the advantages of low surface energy of the fluorine-containing acrylic polymer and high adhesion of the olefin polymer, and cooperatively improves the alkali resistance and gel resistance of the positive electrode binder.
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Citation Information

Patent Citations

  • Binder resin composition for nonaqueous electrolyte energy device electrode, non-aqueous electrolyte energy device electrode, and nonaqueous electrolyte energy device

    CN101023543A