Separator for non-aqueous secondary battery and non-aqueous secondary battery
First Claim
1. A separator for a non-aqueous secondary battery, comprising:
- a porous substrate, anda heat resistant porous layer that is provided on one side or both sides of the porous substrate, that is an aggregate of resin particles and an inorganic filler, and that satisfies the following expression (1);
0.65≤
Vf/CPVC≤
0.99
expression (1)wherein, in expression (1), Vf is a volume proportion (% by volume) of the inorganic filler in the heat resistant porous layer, and CPVC is a critical pigment volume concentration (% by volume) of the inorganic filler,wherein the aggregate of resin particles is configured that plural resin particles and plural filler particles are joined to form the aggregate in a layer form, and the aggregate is fixed on the surface of the porous substrate via at least part of the resin particles,the resin particles include a resin selected from the group consisting of a polyvinylidene fluoride resin, fluoro rubber, styrene-butadiene rubber, ethylene-acrylate copolymer, ethylene-acrylic acid copolymer, polyethylene, ethylene-vinyl acetate copolymer, and a cross-linked acrylic resin, andthe inorganic filler accounts for 50% by mass or more and less than 90% by mass of the total amount of the resin particles and the inorganic filler in the heat resistant porous layer.
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Accused Products
Abstract
Provided is 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 both sides of the porous substrate, that is an aggregate of resin particles and an inorganic filler, and that satisfies the following expression (1). In expression (1), Vf is a volume proportion (% by volume) of the inorganic filler in the heat resistant porous layer, and CPVC is a critical pigment volume concentration (% by volume) of the inorganic filler. Also provided is a separator for a non-aqueous secondary battery, including: a porous substrate, a heat resistant porous layer that is provided on one side or both sides of the porous substrate, that includes a resin and an filler, and that satisfies the following expression (2), and an adhesive porous layer that is provided on both sides of a stacked body of the porous substrate and the heat resistant porous layer, and that includes an adhesive resin. In expression (2), Vf is a volume proportion (% by volume) of the filler in the heat resistant porous layer, and CPVC is a critical pigment volume concentration (% by volume) of the filler.
0.65≤Vf/CPVC≤0.99 expression (1)
0.40≤Vf/CPVC≤0.99 expression (2)
19 Citations
15 Claims
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1. A separator for a non-aqueous secondary battery, comprising:
-
a porous substrate, and a heat resistant porous layer that is provided on one side or both sides of the porous substrate, that is an aggregate of resin particles and an inorganic filler, and that satisfies the following expression (1);
0.65≤
Vf/CPVC≤
0.99
expression (1)wherein, in expression (1), Vf is a volume proportion (% by volume) of the inorganic filler in the heat resistant porous layer, and CPVC is a critical pigment volume concentration (% by volume) of the inorganic filler, wherein the aggregate of resin particles is configured that plural resin particles and plural filler particles are joined to form the aggregate in a layer form, and the aggregate is fixed on the surface of the porous substrate via at least part of the resin particles, the resin particles include a resin selected from the group consisting of a polyvinylidene fluoride resin, fluoro rubber, styrene-butadiene rubber, ethylene-acrylate copolymer, ethylene-acrylic acid copolymer, polyethylene, ethylene-vinyl acetate copolymer, and a cross-linked acrylic resin, and the inorganic filler accounts for 50% by mass or more and less than 90% by mass of the total amount of the resin particles and the inorganic filler in the heat resistant porous layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification