SEPARATOR HAVING HEAT-RESISTANT INSULATING LAYER

摘要

A separator (1) having a heat-resistant insulating layer is provided with a porous substrate (2), and a heat-resistant insulating layer (3) formed on one or both surfaces of the porous substrate (2) and containing at least one type of inorganic particles and at least one type of binder, wherein the content mass ratio of the inorganic particles and the binder is 99:1 to 85:15 (inorganic particles: binder), the BET specific surface area of the inorganic particles is between 3 and 50 m2/g, and 0.0001 < moisture content per binder mass/the BET specific surface area of the inorganic particles < 2.