Current collector undercoat slurry, its coating process, undercoated current collector, electrode, battery

By using deep eutectic solvent (DES) as the dispersion medium in the coating process for lithium-ion battery manufacturing, the problems of solvent toxicity, poor wettability and residue in traditional wet coating processes have been solved, achieving uniform coating and low-cost lithium-ion battery manufacturing.

CN122246138APending Publication Date: 2026-06-19JIANGSU YINGLIAN COMPOSITE FLUID COLLECTION CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU YINGLIAN COMPOSITE FLUID COLLECTION CO LTD
Filing Date
2026-03-31
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

In existing lithium-ion battery manufacturing, the traditional wet coating process suffers from problems such as high solvent toxicity, flammability and explosiveness, high energy consumption for recycling, poor wettability, low interface purity and corrosion. It is difficult to combine the advantages of oil-based and water-based slurries, and the residual solvent content in the slurry is difficult to control.

⚗Method used

Deep eutectic solvent (DES) is used as the dispersion medium. By combining pre-drying, water washing and drying curing steps, a hydrogen bond network is formed to achieve uniform coating. DES residue is removed by water washing, which reduces surface tension, improves wettability and conductivity, and avoids the use of surfactants.

🎯Benefits of technology

It achieves a low-cost and environmentally friendly coating process, reduces the surface tension of the slurry, improves the conductivity and adhesion of the coating, removes potential unstable factors, avoids foaming and interface contamination, and controls the residual amount to below 0.5%.

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Abstract

This invention provides a current collector primer slurry and its coating process, a primer current collector, an electrode, and a battery, relating to the technical field of lithium-ion batteries. The current collector primer slurry comprises the following components: a deep eutectic solvent, a conductive agent, and a binder; the deep eutectic solvent includes hydrogen bond donor (HBD) and hydrogen bond acceptor (HBA). This invention not only achieves relatively uniform coating but also enables efficient removal of the deep eutectic solvent (DES) (residual amount <0.5%), achieving the technical advantages of combining the process performance of oil-based slurries with the environmental friendliness and low cost of water-based slurries.
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