Battery separator and method of manufacturing same
AssigneeToray Industries, Inc.
InventorsNaoki Mizuno, Masami Sugata
Life of this patent
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Abstract
A battery separator includes a polyolefin microporous membrane having a width of 100 mm or more, and a porous layer laminated on at least one surface of the polyolefin microporous membrane. The polyolefin microporous membrane has a variation range of an F25 value in a width direction of 1 MPa or less, and the F25 value indicates a value obtained by dividing a load value measured at 25% elongation of a specimen with use of a tensile tester by a cross-sectional area of the specimen. The porous layer contains a fluorine-based resin and an inorganic particle.
Claims16
A battery separator comprising a polyolefin microporous membrane having a width of 100 mm or more, and a porous layer laminated on at least one surface of the polyolefin microporous membrane, wherein the polyolefin microporous membrane has a variation range of an F25 value in a width direction of 1 MPa or less (wherein the F25 value indicates a value obtained by dividing a load value measured at 25% elongation of a specimen with use of a tensile tester by a cross-sectional area of the specimen), and the porous layer contains a fluorine-based resin and an inorganic particle.
Dependencies are inferred from the claim text.