| 摘要 |
The invention concerns a biaxially orientated, single- or multi-layered porous film which comprises at least one porous layer and this layer contains at least one propylene polymer and polyethylene;
(i) the porosity of the porous film is 30% to 80%; and(ii) the permeability of the porous film is <1000 s (Gurley number);
characterized in that
(iii) the porous film comprises an inorganic, preferably ceramic coating; and(iv) the coated porous film has a Gurley number of <1500 s; and(v) the coated porous film has a Gurley number of >6000 s when it is heated for 5 minutes to over 140° C.;The coated, porous film has dual safety features. Furthermore, the invention also concerns a process for the production of a film of this type as well as its use in high energy or high performance systems, in particular in lithium, lithium ion, lithium-polymer and alkaline-earth batteries. |
