| abstract |
The invention relates to a bi-axially oriented, single or multi-layered porous film comprising at least one porous layer that contains at least one propylene polymer, (i) the porosity of this porous film being between 30% and 80%, (ii) the permeability of the porous film being <1000s (Gurley value), and this being characterized in that (iii) said porous film has an inorganic, preferably ceramic, coating and that (iv) the coated porous film has a Gurley value of <1500s. In addition, the invention also relates to a method for producing such a film as well as to the use thereof in high-energy or high-power systems, particularly in lithium, lithium-ion, lithium-polymer, and alkaline-earth batteries. |