Teijin Limited

Megumi Sato

Satoshi Nishikawa

Rika Kuratani

Yu Nagao

Masato Okazaki

An embodiment of the invention provide a separator for a non-aqueous secondary battery, including a porous substrate; and a heat-resistant porous layer that is provided on one side or on both sides of the porous substrate, and that contains a binder resin and barium sulfate particles, in which an average primary particle diameter of the barium sulfate particles contained in the heat-resistant porous layer is from 0.01 μm to less than 0.30 μm, and in which a volume ratio of the barium sulfate particles in the heat-resistant porous layer is from 30% by volume to less than 50% by volume.

Separator for non-aqueous secondary battery and non-aqueous secondary battery

An embodiment according to the invention provides a separator for a non-aqueous secondary battery, containing a porous substrate and an adhesive porous layer that contains resin A and resin B1; (1) resin A: a copolymer containing vinylidene fluoride (VDF) and hexafluoropropylene (HFP), in which a molar content of HFP monomer unit with respect to a total molar quantity of VDF monomer unit and HFP monomer unit is from more than 1.5 mol % to 3.5 mol %, and (2) resin B1: a copolymer containing VDF, HFP, and a monomer of formula (1), in which a molar content of HFP monomer unit with respect to a total molar quantity of VDF monomer unit, HFP monomer unit, and a monomer unit of formula (1) is from more than 3.5 mol % to 15 mol % (Rto R: H, a halogen atom, a carboxyl group, etc., or a Calkyl group; X: a single bond, a Calkylene group, etc., Y: H, a Calkyl group, etc.):

Provided is a separator for a non-aqueous secondary battery containing a porous substrate; and a heat-resistant porous layer that is provided on one side or on both sides of the porous substrate, and that contains a polyvinylidene fluoride type resin A that is a polyvinylidene fluoride type resin containing a tetrafluoroethylene unit; a polyvinylidene fluoride type resin B that is a polyvinylidene fluoride type resin other than the polyvinylidene fluoride type resin A; and a filler, in which an average primary particle diameter of the filler contained in the heat-resistant porous layer is from 0.01 μm to 1.0 μm.

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Osaka, Japan

Megumi Sato