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Title:
POLYOLEFIN MULTILAYER MICROPOROUS MEMBRANE, LAMINATED POLYOLEFIN MULTILAYER MICROPOROUS MEMBRANE, AND BATTERY SEPARATOR
Document Type and Number:
WIPO Patent Application WO/2023/002818
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a polyolefin microporous membrane having excellent balance among ionic permeability, compression resistance, withstand voltage characteristics, and deformation adaptability to an electrode volume change. The present invention is a polyolefin multilayer microporous membrane obtained by laminating a first microporous layer containing polypropylene and polyethylene and a second microporous layer containing polyethylene, wherein: in a temperature-melting endothermic amount curve obtained through measurement with a differential scanning calorimeter (DSC), (∆H1-∆H2)/∆H2×100≥20, where ∆H1 is the melting endothermic amount of polyethylene during first melting in the temperature range of 0-157ºC, and ∆H2 is the melting endothermic amount of polyethylene during second melting; when the content of the polyolefin in the first microporous layer is 100 mass% in the AFM-IR measurement of the cross section of the polyolefin multilayer microporous membrane, the content ratio of the polypropylene in the first microporous layer is 10-50 mass% (exclusive of 50); and the porosity is 35-70%.

Inventors:
CHEN YANZI (JP)
KANEKO KEI (JP)
NAKAJIMA KONOMI (JP)
Application Number:
PCT/JP2022/025911
Publication Date:
January 26, 2023
Filing Date:
June 29, 2022
Export Citation:
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Assignee:
TORAY INDUSTRIES (JP)
International Classes:
B32B5/18; B32B27/32; H01M50/417; H01M50/449; H01M50/489; H01M50/491; H01M50/494
Domestic Patent References:
WO2015194667A12015-12-23
WO2007010878A12007-01-25
WO2015170653A12015-11-12
WO2019093184A12019-05-16
WO2020149294A12020-07-23
WO2015182689A12015-12-03
WO2018168871A12018-09-20
WO2018168835A12018-09-20
WO2014192862A12014-12-04
WO2013146403A12013-10-03
WO2006106783A12006-10-12
WO2008016174A12008-02-07
WO2007132942A12007-11-22
Foreign References:
JP2013517152A2013-05-16
JP2013126765A2013-06-27
JP2008255307A2008-10-23
JP2010036355A2010-02-18
JP2019072901A2019-05-16
JP207327B2
JP2002256099A2002-09-11
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