Battery separator
AssigneeJapan Vilene Company, Ltd.
InventorsToshiaki Takase, Yoshihiko Kondo, Noriko Miyaguchi, Masanao Tanaka
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Abstract
Disclosed is a battery separator consisting essentially of a nonwoven fabric having a substantially unilayered structure, wherein an apparent total surface area of fibers per a surface density of the nonwoven fabric is 20 m2 or more, a thickness of the nonwoven fabric is 0.1 mm or less, a uniformity index of the nonwoven fabric is 0.15 or less, and the nonwoven fabric contains fine fibers having a fiber diameter of 4 μm or less.
Claims22
A battery separator consisting essentially of a nonwoven fabric having a substantially unilayered structure, wherein an apparent total surface area of fibers per a surface density of said nonwoven fabric is 20 m2 or more, a thickness of said nonwoven fabric is 0.1 mm or less, a uniformity index of said nonwoven fabric is 0.15 or less, said nonwoven fabric consists essentially of non-fibrillated fibers, said nonwoven fabric contains fine fibers having a fiber diameter of 4 μm or less and high-modulus fibers having a Young's modulus of 50 cN/dtex or more, the fibers forming the nonwoven fabric are fixed substantially only by fusing the fibers to each other, the high-modulus fibers are composed of ultra-high-molecular-weight polyethylene, and the fine fibers are formed from island components remaining after removing a sea component from islands-in-sea composite fibers,
- wherein an average fiber diameter of the high-modulus fibers is 5 times or more an average fiber diameter of the fine fibers.
A battery separator consisting essentially of a nonwoven fabric having a substantially unilayered structure, wherein an apparent total surface area of fibers per a surface density of said nonwoven fabric is 20 m2 or more, a thickness of said nonwoven fabric is 0.1 mm or less, a uniformity index of said nonwoven fabric is 0.15 or less, said nonwoven fabric consists essentially of non-fibrillated fibers, said nonwoven fabric contains fine fibers having a fiber diameter of 4 μm or less and high-modulus fibers having a Young's modulus of 50 cN/dtex or more and a fiber length of 0.5 to 30 mm, the fibers forming the nonwoven fabric are fixed substantially only by fusing the fibers to each other, the high-modulus fibers are composed of high-crystalline polypropylene, and the fine fibers are formed from island components remaining after removing a sea component from islands-in-sea composite fibers,
- wherein an average fiber diameter of the high-modulus fibers is 5 times or more an average fiber diameter of the fine fibers.
A battery separator consisting essentially of a nonwoven fabric having a substantially unilayered structure, wherein an apparent total surface area of fibers per a surface density of said nonwoven fabric is 20 m2 or more, a thickness of said nonwoven fabric is 0.1 mm or less, a uniformity index of said nonwoven fabric is 0.15 or less, said nonwoven fabric consists essentially of non-fibrillated fibers, said nonwoven fabric contains fine fibers having a fiber diameter of 4 μm or less and high-modulus fibers having a Young's modulus of 50 cN/dtex or more, the fibers forming the nonwoven fabric are fixed substantially only by fusing the fibers to each other, the high-modulus fibers are composite fibers composed of high-crystalline polypropylene and having a surface of a polyethylene-based resin, and the fine fibers are formed from island components remaining after removing a sea component from islands-in-sea composite fibers,
- wherein an average fiber diameter of the high-modulus fibers is 5 times or more an average fiber diameter of the fine fibers.
A battery separator consisting essentially of a nonwoven fabric having a substantially unilayered structure, wherein an apparent total surface area of fibers per a surface density of said nonwoven fabric is 20 m2 or more, a thickness of said nonwoven fabric is 0.1 mm or less, a uniformity index of said nonwoven fabric is 0.15 or less, said nonwoven fabric consists essentially of non-fibrillated fibers, said nonwoven fabric contains fine fibers having a fiber diameter of 4 μm or less and high-modulus fibers having a Young's modulus of 50 cN/dtex or more, the fibers forming the nonwoven fabric are fixed substantially only by fusing the fibers to each other, the high-modulus fibers are composed of ultra-high-molecular-weight polyethylene, and said nonwoven fabric consists essentially of polyolefin-based fibers,
- wherein an average fiber diameter of the high-modulus fibers is 5 times or more an average fiber diameter of the fine fibers.
A battery separator consisting essentially of a nonwoven fabric having a substantially unilayered structure, wherein an apparent total surface area of fibers per a surface density of said nonwoven fabric is 20 m2 or more, a thickness of said nonwoven fabric is 0.1 mm or less, a uniformity index of said nonwoven fabric is 0.15 or less, said nonwoven fabric consists essentially of non-fibrillated fibers, said nonwoven fabric contains fine fibers having a fiber diameter of 4 μm or less and high-modulus fibers having a Young's modulus of 50 cN/dtex or more and a fiber length of 0.5 to 30 mm, the fibers forming the nonwoven fabric are fixed substantially only by fusing the fibers to each other, the high-modulus fibers are composed of high-crystalline polypropylene, and said nonwoven fabric consists essentially of polyolefin-based fibers,
- wherein an average fiber diameter of the high-modulus fibers is 5 times or more an average fiber diameter of the fine fibers.
A battery separator consisting essentially of a nonwoven fabric having a substantially unilayered structure, wherein an apparent total surface area of fibers per a surface density of said nonwoven fabric is 20 m2 or more, a thickness of said nonwoven fabric is 0.1 mm or less, a uniformity index of said nonwoven fabric is 0.15 or less, said nonwoven fabric consists essentially of non-fibrillated fibers, said nonwoven fabric contains fine fibers having a fiber diameter of 4 μm or less and high-modulus fibers having a Young's modulus of 50 cN/dtex or more, the fibers forming the nonwoven fabric are fixed substantially only by fusing the fibers to each other, the high-modulus fibers are composite fibers composed of high-crystalline polypropylene and having a surface of a polyethylene-based resin, and said nonwoven fabric consists essentially of polyolefin-based fibers,
- wherein an average fiber diameter of the high-modulus fibers is 5 times or more an average fiber diameter of the fine fibers.
Dependencies are inferred from the claim text.