| abstract |
Separator, comprising: a porous substrate; and being characterized by a porous layer, the porous layer being disposed on a surface of the porous substrate and comprising inorganic particles and a binder, wherein the ratio of the piercing elongation of the porous substrate to the piercing force of the porous substrate is from 1.5 to 25 mm/N, in which the drilling elongation and drilling force are determined as indicated in paragraph 3.4 of the description. |