Substrate for lithium ion battery separators and lithium ion battery separator

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United States of America Patent

PATENT NO 11637349
APP PUB NO 20210288382A1
SERIAL NO

16323334

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Abstract

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It is an object of the present invention to provide a substrate for lithium ion battery separators which has high adhesion to an inorganic particle layer, can be made thin and is excellent in tensile strength and cuttability and a lithium ion battery separator including the substrate for lithium ion battery separators. The substrate for lithium ion battery separators which contains heat-resistant fibers and synthetic resin short fibers contains fibrillated heat-resistant fibers having a modified freeness of not more than 300 ml as the heat-resistant fibers and has a content of the fibrillated heat-resistant fibers having a modified freeness of not more than 300 ml of not less than 1.0 mass % to less than 5.0 mass % based on the total of all the fiber components contained in the substrate. The modified freeness is a value measured in accordance with JIS P8121-2:2012 except that an 80-mesh wire net having a wire diameter of 0.14 mm and an opening of 0.18 mm is used as a screening plate and the concentration of a sample is 0.1%.

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Patent Owner(s)

Patent OwnerAddress
MITSUBISHI PAPER MILLS LIMITED4-2 MARUNOUCHI 3-CHOME CHIYODA-KU TOKYO 100-0005

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kato, Makoto Tokyo, JP 278 3323
Sato, Tomohiro Tokyo, JP 92 545
Shigematsu, Toshihiro Tokyo, JP 13 121

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