Waterborne polyurethane dispersion and application thereof in lithium battery adhesive

Aqueous polyurethane dispersions prepared using specific components and processes have solved the problems of insufficient adhesion, poor conductivity, and insufficient safety of aqueous polyurethane adhesives, enabling the green production of high-performance lithium battery anode adhesives and improving the conductivity and cycle performance of lithium batteries.

CN121825484APending Publication Date: 2026-04-10WANHUA CHEM GRP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WANHUA CHEM GRP CO LTD
Filing Date
2025-12-19
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Existing waterborne polyurethane as a lithium battery anode adhesive suffers from weak adhesion, poor conductivity, and insufficient safety. Furthermore, residual solvents may remain during the synthesis process, affecting safety.

Method used

Aqueous polyurethane dispersions are prepared using specific components and processes, including polymeric polyols, polyisocyanates, hydrophilic compounds, non-hydrophilic alcohol chain extenders, acrylate monomers, and compounds containing tertiary amine groups. Through prepolymerization, chain extension, and self-emulsification processes, the use of additional solvents is avoided, and piperazine structures are introduced to enhance lithium-ion transport.

Benefits of technology

It improves the adhesion, conductivity, and safety of waterborne polyurethane adhesives, inhibits swelling, reduces internal resistance, enhances charge and discharge efficiency, and enables green and environmentally friendly production while reducing solvent safety risks.

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Abstract

The invention discloses a preparation method and application of a lithium battery negative electrode adhesive waterborne polyurethane dispersoid, and the preparation method comprises the following steps: adding polymer polyol a, polyisocyanate b, a hydrophilic chain extender c, a non-hydrophilic alcohol chain extender d and a part of monomer e into a prepolymerization reaction kettle, and reacting to obtain an NCO-terminated prepolymer; adding part of the monomer e and the neutralizer, and mixing; after uniformly dispersing, adding a compound f containing at least one tertiary amine group and at least one NCO reactive functional group, and carrying out chain extension reaction to obtain a crude emulsion; and transferring the crude emulsion into a polymerization kettle, initiating polymerization, cooling and filtering to obtain the waterborne polyurethane emulsion. By adopting the specific chemical raw material f, the conductivity of the waterborne polyurethane serving as the negative electrode adhesive can be improved, and the electrical property of the lithium battery is improved; acrylic acid is adopted for modification, so that the viscosity of the negative electrode adhesive is improved and expansibility is inhibited.
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Citation Information

Patent Citations

  • Waterborne polyurethane dispersion as well as preparation method and application thereof

    CN119219889A