TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Particles: The inorganic particles are a mixture of inorganic particles (A) having a permittivity constant of 5 or more and inorganic particles (B) having lithium ion transfer capability. Inorganic particles (A) contain barium titanate, lead-zirconate titanate (Pb(Zrx,Ti1-x)O3, where x is greater than 0 and less than 1), lead-lanthanum-zirconium titanate (Pb1-xLaxZr1-yTiyO3, where x and y are greater than 0 and less than 1), lead-magnesium niobate-lead titanate ((1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3, where x is greater than 0 and less than 1), hafnia, strontium titanate, tin oxide, ceria, magnesium oxide, nickel oxide, calcium oxide, zinc oxide, zirconia, silica, yttria, alumina, silicon carbide, and/or titania. Inorganic particles (B) contain lithium phosphate, lithium-titanium phosphate (LixTiy(PO4)3, where x is greater than 0 and less than 2, and y is greater than 0 and less than 3), lithium-aluminum-titanium phosphate (LixAlyTiz(PO4)3, where x is greater than 0 and less than 2, y is greater than 0 and less than 1, and z is greater than 0 and less than 3), lithium-aluminum-titanium-phosphorus oxide type glass ((LiAlTiP)xOy, where x is greater than 0 and less than 4, and y is greater than 0 and less than 13), lithium-lanthanum titanate (LixLayTiO3, where x is greater than 0 and less than 2, and y is greater than 0 and less than 3), lithium-germanium thiophosphate (LixGeyPzSw, where x is greater than 0 and less than 4, y is greater than 0 and less than 1, z is greater than 0 and less than 1, and w is greater than 0 and less than 5), lithium nitride (LixNy, where x is greater than 0 and less than 4, and y is greater than 0 and less than 2), lithium-silicon sulfide type glass (LixSiySz, where x is greater than 0 and less than 3, y is greater than 0 and less than 2, and z is greater than 0 and less than 4), and/or lithium-phosphorus sulfide (LixPySz, where x is greater than 0 and less than 3, y is greater than 0 and less than 3, and z is greater than 0 and less than 7). The inorganic coating layer comprises 0.1-50 pts. wt. binder polymer and 100 pts. wt. inorganic particles.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The coating layers further contain 0.5-20 pts. wt. battery-performance improvement additive, additive for solid electrolyte interface formation, battery side-reaction control additive, thermal stability improvement additive, and/or overcharging suppression additive. The additive for solid electrolyte interface formation is vinylene carbonate, vinyl ethylene carbonate, cyclic sulfite, (un)saturated sultone, noncyclic sulfone, and/or their derivatives. The battery side-reaction control additive is EDTA, tetramethylethylenediamine, pyridine, dipyridyl, ethylenebis(diphenyl phosphine), butyronitrile, succinonitrile, iodine, ammonium halide, and/or their derivatives. The thermal stability improvement additive is hexamethyldisiloxane, hexamethoxy cyclotriphosphazene, hexamethylphosphoramide, cyclohexylbenzene, biphenyl, dimethylpyrrole, trimethyl phosphate, and/or their derivatives. The overcharging suppression additive is n-butyl ferrocene, halo-substituted benzene derivative, cyclohexylbenzene, and/or biphenyl.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The porous base material is a polyolefin type porous film or a nonwoven fabric. The porous base material comprises polypropylene, polybutylene, polypentene, polymethylpentene, polyethylene terephthalate, polybutylene terephthalate, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyetheretherketone, polyethersulfone, polyphenylene oxide, polyphenylene sulfide, polyethylene naphthalate, and/or their copolymers. The binder polymer is polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethylmethacrylate, polybutylacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethyl pullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, and/or carboxyl methyl cellulose. The high-heat-resistance polymer is para or meta type aromatic polyamide, aromatic polyimide, aromatic polyamidoimide, aromatic polyimine, Teflon (RTM: PTFE), polybenzoxazole, polybenzimidazole, polyphenylene sulfide, and/or polyphenylene oxide. The high-heat-resistant polymer coating layer comprises 0.1-40 pts. wt. inorganic particles and 100 pts. wt. polymer. Preferred Property: The separator has a porosity of 30-70% and a gas permeability of 150-400 seconds/100 ml.