Title:
POLYOLEFIN MICROPOROUS MEMBRANE, SEPARATOR FOR SECONDARY BATTERIES, AND SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2024/024710
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a polyolefin microporous membrane which, when the polyolefin microporous membrane is incorporated into a battery as a separator, exhibits excellent safety if the battery reaches a high temperature. The present invention provides a polyolefin microporous membrane wherein: when T50 is the temperature at which the crystal melting endotherm as measured by differential scanning calorimetric analysis (first heating) is 50% of the total melting endotherm and T10 is the temperature at which said crystal melting endotherm is 10% of the total melting endotherm, T50 - T10 ≥ 15°C is satisfied; and the strength PS5 at 5 mm displacement as determined by puncture strength measurement at the shutdown temperature is 7.0 gf/g/m2 or more.
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Inventors:
KUMAGAI SOYA (JP)
TAKEDA KENTO (JP)
OKAMOTO HIROYA (JP)
TAKEDA KENTO (JP)
OKAMOTO HIROYA (JP)
Application Number:
PCT/JP2023/026950
Publication Date:
February 01, 2024
Filing Date:
July 24, 2023
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
C08J9/26; B29C55/12; B29C67/20; H01G9/02; H01G11/52; H01M50/417; H01M50/489; H01M50/494
Domestic Patent References:
| WO2017010528A1 | 2017-01-19 | |||
| WO2007052663A1 | 2007-05-10 | |||
| WO2020195380A1 | 2020-10-01 |
Foreign References:
| JP2022082461A | 2022-06-01 |
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