Separator having heat resistant insulation layers

摘要

A separator (1) having heat resistant insulation layers for an electric device includes a resin porous substrate (2), and heat resistant insulation layers (3) formed on both surfaces of the resin porous substrate (2) and containing heat resistant particles having a melting point or a thermal softening point of 150° C. or higher. A parameter X represented by the following mathematical formula 1 is greater than or equal to 0.15:;X=(A′+A″)C×(A′/A″)2[Math⁢⁢1]where A′ and A″ represent thicknesses (μm) of the respective heat resistant insulation layers (3) formed on both surfaces of the resin porous substrate (2) while fulfilling a condition of A′≧A″, and C represents the entire thickness (μm) of the separator (1) having heat resistant insulation layers.

主权项

1. A separator having heat resistant insulation layers for an electric device, the separator comprising:
a resin porous substrate; and heat resistant insulation layers formed on both surfaces of the resin porous substrate and containing heat resistant particles having a melting point or a thermal softening point of 150° C. or higher, wherein a parameter X represented by the following mathematical formula 1 is greater than or equal to 0.15:X=(A′+A″)C×(A′/A″)2[Math⁢⁢1]where A′ and A″ represent thicknesses (μm) of the respective heat resistant insulation layers formed on both surfaces of the resin porous substrate while fulfilling a condition of A′>A″, and C represents an entire thickness (μm) of the separator having the heat resistant insulation layers,
wherein C is greater than or equal to 24.5 μm, and wherein a parameter Y represented by the following mathematical formula 2 is in a range from 0.3 to 0.7:Y=X(D/100)[Math⁢⁢2]where D represents a porosity (%) of the respective heat resistant insulation layers.