TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The inorganic particle is tin oxide, barium titanate, aluminum oxide, cerium(iv) oxide, silicon dioxide, titanium dioxide, lithium phosphate, zinc oxide, magnesium oxide, magnesium hydroxide, calcium oxide, zirconium dioxide, yttrium(iii) oxide and talc, and has average granularity of 0.001-10 mu m. The separating film has the thickness of 0.1-50 mu m, the pore size of 0.001-10 mu m, and the porosity of 20-80%.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The polymeric compound binder further includes a third organic binder including water-soluble polymeric compound. The separating film is made of the nonwoven fabric. The porous base material is high-density polyethylene, low density polyethylene, linear low density polyethylene, the ultrahigh molecular weight polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyether-ether-ketone, polyethersulfone, polyphenylene oxide, polyphenylene sulfide and polyethylene naphthalate. The porous base material has the thickness of 1-100 mu m, the pore size of 0.01-50 mu m, and the porosity of 10-90%. The second organic binder is phosphate ester, phosphate acryl group copolymer, modified acryl rate type copolymer, modified acryl mountain system copolymer, ester and amine amide system copolymer, carboxylic system copolymer, alkylol aminoamide copolymer, siloxane and acrylic copolymer, siloxane and carboxylic system copolymer, alkoxylate copolymer or the copolymer of the acryl group and ether type. The third organic binder is polyethylene oxide, carboxylmethylcellulose, polyvinyl alcohol, polyvinyl pyrrolidone or starch. The first organic binder is polystyrene group, styrenebutadiene system rubber, nitrile rubber, polyolefin-group, acryl group, acetate system, polyvinylidene fluoride (PVDF) group or PVDF group copolymer, ethylene-vinylacetate system or polyvinyl butyral-based or polytetrafluoroethylene group polymer.