TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: Inorganic particles are chosen from inorganic particles having dielectric constant of 5 or more and/or inorganic particles having lithium ion transfer capability. The inorganic particles having dielectric constant of 5 or more, are chosen from 18 compounds e.g. barium titanate, calcium oxide, nickel oxide, zinc oxide and magnesium oxide. The inorganic particles having lithium ion transfer capability, are chosen from 9 compounds e.g. lithium phosphate, lithium-titanium phosphate (LixTiy(PO4)3, where x is 0-2, and y is 0-3), lithium-aluminum-titanium phosphate (Lix'Aly'Tiz'(PO4)3, where x' is 0-2, y' is 0-1 and z' is 0-3), lithium-lanthanum titanate (LixLayTiO3) and lithium nitride (LiaNb, where a is 0-4 and b is 0-2).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The solvent is chosen from acetone, tetrahydrofuran, methylene chloride, chloroform, dimethylformamide, N-methypyrrolidone and/or cyclohexane. The nonsolvent is chosen from methanol, ethanol, isopropyl alcohol and/or water. The weight ratio of the nonsolvent and solvent is 50:50-99:1.    TECHNOLOGY FOCUS - POLYMERS - Preferred Process: The secondary porous coating layer is formed by coating a mixture containing solvent, nonsolvent and binder polymer (B) and drying. Preferred Composition: The separator further has electrode bonding layer formed on the surface of the primary porous coating layer and including binder polymer (C). The porous base material is polyolefin-based porous base material. The polyolefin-based porous base material is chosen from polyethylene, polypropylene, polybutylene and polypentene. The binder polymer (A), binder polymer (B) and binder polymer (C) are chosen from poly(vinylidene fluoride-co-hexafluoropropylene), polyvinylidene fluoride-co-trichloroethylene, polymethylmethacrylate, polybutylacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan and carboxylmethylcellulose.