Title:
POLYOLEFIN MICROPOROUS MEMBRANE, SEPARATOR FOR BATTERIES, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND FILTER
Document Type and Number:
WIPO Patent Application WO/2023/176876
Kind Code:
A1
Abstract:
The present invention provides a polyolefin microporous membrane which has a unit weight-converted puncture strength of 0.8 N/(g/m2) or more, wherein: in the molecular weight distribution of the polyolefin microporous membrane as obtained by a gel permeation chromatography method (GPC method), taking molecular weight on the horizontal axis and detected intensity on the vertical axis, if the total amount of all components is taken as 100%, the amount of components having a molecular weight of 10,000,000 or more is 1.0% or less; and if all detected intensities are normalized, while taking the maximum detected intensity as 1, and if K200 is the detected intensity at the molecular weight of 2,000,000 and K700 is the detected intensity at the molecular weight of 7,000,000, K200 and K700 satisfy the relational expression (K200 - K700) ≥ 0.4. The present invention provides a polyolefin microporous membrane which enables the achievement of excellent battery characteristics and excellent battery safety when used as a separator for a battery.
Inventors:
SHIMOKAWATOKO HARUKA (JP)
KUMA TAKUYA (JP)
NISHIMURA NAOYA (JP)
NAKASHIMA RYOTA (JP)
KUMA TAKUYA (JP)
NISHIMURA NAOYA (JP)
NAKASHIMA RYOTA (JP)
Application Number:
PCT/JP2023/010054
Publication Date:
September 21, 2023
Filing Date:
March 15, 2023
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
C08J9/26; H01G11/52; H01M8/0239; H01M8/1062; H01M50/417; H01M50/431; H01M50/449; H01M50/489
Domestic Patent References:
| WO2020256138A1 | 2020-12-24 | |||
| WO2018164056A1 | 2018-09-13 | |||
| WO2018164057A1 | 2018-09-13 | |||
| WO2018173904A1 | 2018-09-27 | |||
| WO2010079784A1 | 2010-07-15 |
Foreign References:
| JP2018162438A | 2018-10-18 |
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