Coating device, method for manufacturing a separator using the same, and separator for lithium secondary battery manufactured thereby

KR102993397B1Active Publication Date: 2026-07-21LG ENERGY SOLUTION LTD
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Patent Information

Application Number
KR1020250085143
Authority / Receiving Office
KR · KR
Patent Type
Patents
Current Assignee / Owner
Priority Date
2024-06-26
Filing Date
2025-06-26
Publication Date
2026-07-21
Estimated Expiration
2045-06-26

AI Technical Summary

Technical Problem

Existing methods for manufacturing separators in lithium secondary batteries face issues with solvent volatilization, increased viscosity, and aggregation of solutes in coating solutions, leading to degraded quality and difficulty in recycling unused coating solution.

Method used

A coating apparatus equipped with an ultrasonic generator and recovery unit to control particle size and viscosity, deaggregate inorganic particles and binder, and recycle unused coating solution, ensuring consistent quality.

Benefits of technology

The apparatus maintains constant particle size and viscosity of the coating solution, producing separators with excellent surface roughness and uniformity, enhancing mechanical and thermal stability while recycling unused solution.

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Abstract

The present invention provides a coating device comprising: a coater head; a receiving chamber located inside the coater head and receiving a coating liquid; an ultrasonic generator located inside the coater head and applying ultrasonic waves to the coating liquid received in the receiving chamber; and a coating bar that transfers the coating liquid from the receiving chamber onto at least one surface of a substrate being transported in one direction.
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Citation Information

Patent Citations

  • Coating machine

    JP1992108561A

  • Coating apparatus and coating method

    JP2003251256A