Title:
MICROPOROUS POLYOLEFIN MEMBRANE AND SEPARATOR FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES
Document Type and Number:
WIPO Patent Application WO/2021/015269
Kind Code:
A1
Abstract:
The present invention relates to a microporous polyolefin membrane which has a shrinkage ratio of less than 10% in the MD direction at 105°C/8h and a fibril diameter of from 10 nm to 50 nm, wherein if a 11.7 μm × 9.4 μm rectangular field of view of a surface SEM observation image as obtained by the observation with a scanning electron microscope (SEM) is divided into 0.5 μm × 0.5 μm pieces, the sum of resin areas in the pieces satisfying R2 ≥ R1, namely (non-opening parts a in the surface) is 20 μm2 or less in the 11.7 μm × 9.4 μm area of the surface SEM observation image.
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Inventors:
TOYOTA NAOKI (JP)
SAKAMOTO MITSUTAKA (JP)
TANAKA HIROKO (JP)
NAKASHIMA RYOTA (JP)
FUJIWARA SATOSHI (JP)
ISHIHARA TAKESHI (JP)
OHKURA MASATOSHI (JP)
WATANABE MITSURU (JP)
KAJIWARA YUNA (JP)
SAKAMOTO MITSUTAKA (JP)
TANAKA HIROKO (JP)
NAKASHIMA RYOTA (JP)
FUJIWARA SATOSHI (JP)
ISHIHARA TAKESHI (JP)
OHKURA MASATOSHI (JP)
WATANABE MITSURU (JP)
KAJIWARA YUNA (JP)
Application Number:
PCT/JP2020/028547
Publication Date:
January 28, 2021
Filing Date:
July 22, 2020
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
C08J9/00; C08J9/26; H01G9/02; H01G11/52; H01M8/0239; H01M10/052; H01M10/0566
Foreign References:
| JP2018147885A | 2018-09-20 | |||
| JP2016081621A | 2016-05-16 | |||
| JP2008218085A | 2008-09-18 | |||
| JPH11322988A | 1999-11-26 | |||
| JPH1192587A | 1999-04-06 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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