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 = A¹ + A¹¹ C × A¹ / A¹¹ 2 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 (gm) of the separator (1) having heat resistant insulation layers.