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US 2020/0091486 A1Published application
Lithium ion battery separator and lithium ion battery
AssigneeMitsubishi Paper Mills Limited
InventorToshihiro SHIGEMATSU
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AssigneeMitsubishi Paper Mills Limited
InventorToshihiro SHIGEMATSU
Estimating the term…
It is an object of the present invention to provide a lithium ion battery separator which can be made thin, is excellent in tensile strength and cuttability and has low internal resistance, a low incidence of internal short circuit failure and high cycle characteristics and a lithium ion battery including the separator. In a lithium ion battery separator containing heat-resistant fibers and synthetic resin short fibers, fibrillated heat-resistant fibers having a modified freeness of not more than 300 ml are contained as the heat-resistant fibers, and the content of the fibrillated heat-resistant fibers having a modified freeness of not more than 300 ml is not less than 1.0 mass % to less than 5.0 mass % based on the total of all the fiber components contained in the separator. Modified freeness: This 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%.
A lithium ion battery separator comprising heat-resistant fibers and synthetic resin short fibers, wherein fibrillated heat-resistant fibers having a modified freeness of not more than 300 ml are contained as the heat-resistant fibers, and the content of the fibrillated heat-resistant fibers having a modified freeness of not more than 300 ml is not less than 1.0 mass % to less than 5.0 mass % based on the total of all the fiber components contained in the separator,
A lithium ion battery separator comprising heat-resistant fibers and synthetic resin short fibers, wherein fibrillated heat-resistant fibers having a modified freeness of not more than 300 ml and fibrillated heat-resistant fibers having a modified freeness of more than 300 ml are contained as the heat-resistant fibers, and the total content of the fibrillated heat-resistant fibers having a modified freeness of not more than 300 ml and the fibrillated heat-resistant fibers having a modified freeness of more than 300 ml is not less than 2.0 mass % to less than 9.0 mass % based on the total of all the fiber components contained in the separator, wherein 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%.
A lithium ion battery separator comprising heat-resistant fibers and synthetic resin short fibers, wherein heat-resistant fibers having a modified freeness of not more than 300 ml and a fibrid made of para-aromatic polyamide having a modified freeness of not more than 300 ml are contained as the heat-resistant fibers, and the total content of the heat-resistant fibers is not less than 1.0 mass % to less than 5.0 mass % based on the total of all the fiber components contained in the separator,
A lithium ion secondary battery comprising heat-resistant fibers and synthetic resin short fibers, wherein a fibrid made of para-aromatic polyamide, fibrillated heat-resistant fibers having a modified freeness of not more than 300 ml and fibrillated heat-resistant fibers having a modified freeness of more than 300 ml are contained as the heat-resistant fibers, and the total content of the heat-resistant fibers is not less than 2.0 mass % to less than 9.0 mass % based on the total of all the fiber components contained in the separator,
Dependencies are inferred from the claim text.