Separator and manufacturing method therefor
A separator with a polyolefin-hydrophilic polymer structure addresses heat resistance and impregnation issues, improving mechanical strength and electrolyte distribution for enhanced battery performance and productivity.
WO2026146696A1PCT designated stage Publication Date: 2026-07-09W SCOPE CHUNGJU PLANT CO LTD
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- W SCOPE CHUNGJU PLANT CO LTD
- Filing Date
- 2025-01-14
- Publication Date
- 2026-07-09
AI Technical Summary
Technical Problem
Conventional polyolefin-based separators in secondary batteries face challenges with poor heat resistance, mechanical strength, and uneven electrolyte impregnation, leading to reduced performance and productivity issues.
Method used
A separator with a hydrophobic region containing polyolefin and a hydrophilic region with a dispersed hydrophilic polymer, manufactured through a process involving extrusion, stretching, and heat-setting, to enhance electrolyte impregnation and mechanical properties.
Benefits of technology
The solution achieves balanced mechanical properties, improved electrolyte impregnation, and increased process productivity, ensuring uniform electrolyte distribution in both plane and thickness directions, thereby enhancing battery performance and stability.
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Smart Images
Figure KR2025000792_09072026_PF_FP_ABST
Abstract
One aspect of the present invention relates to a separator comprising a porous film having: a hydrophobic region including polyolefin; and a hydrophilic region including a hydrophilic polymer dispersed in the hydrophobic region, and provides a separator and a manufacturing method therefor, wherein when derived by a method comprising the steps of: laminating 30 or more sheets of the porous films to form a laminate; dropwise adding 2 μL of propylene carbonate onto one surface of the laminate and allowing the laminate to stand for 5 minutes; peeling the porous films one by one from the other surface of the laminate while checking the wetting state of propylene carbonate; and determining the number (X) of porous films in the laminate for which the wetting state of propylene carbonate is confirmed, X is 20 or more.
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