TECHNOLOGY FOCUS - ELECTRONICS - Preferred Device: The electrochemical device further comprises a microporous separator.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The inorganic particles are selected from at least one of inorganic particles having a dielectric constant of greater than or equal to 5; and inorganic particles having lithium ion conductivity. The inorganic particles having a dielectric constant of greater than or equal to 5 are BaTiO3, Pb(Zr,Ti)O3 (PZT), Pb1-xLaxZr1yTiyO3 (PLZT), Pb(Mg3Nb2/ 3)O3-PbTiO3 (PMN-PT), hafnia (HfO2), SrTiO3, SnO2, CeO2, MgO, NiO, CaO, ZnO, ZrO2, Y2O3, Al2O3, TiO2 or SiC. The inorganic particles having lithium ion conductivity are selected from at least one of: lithim phosphate (Li3PO4), lithium titanium phosphate (LixTiy(PO4)3, where x is 0-2, and y is 0-3), lithium aluminum titanium phosphate (LixAlyTiz(PO4)3, where x is 0-2, y is 0-1, and z is 0-3), (LiAlTiP)xOy type glass (where x is 0-4, and y is 0-13), lithium lanthanum titanate (LixLayTiO3, where x is 0-2, and y is 0-3), lithium germanium thiophosphate (LixGeyPzSw, where x is 0-4, y is 0-1, z is 0-1, and w is 0-5), lithium nitrides(LixNy, where x is 0-4, and y is 0-2), SiS2 type glass (LixSiySx, where x is 0-3, y is 0-2, and z is 0-4) and P2S5 type glass (LixPySz, where x is 0-3, y is 0-3, and z is 0-7). The inorganic particles have a size of 0.001-10 mu m; and are present in the mixture of inorganic particles with the binder polymer in an amount of 50-99 wt.% based on 100 wt.% of the mixture.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The binder polymer has a glass transition temperature (Tg) of -200to 200 degrees C; a solubility parameter of 15-45 MPa1/2. The binder polymer is selected from at least one of polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethylmethacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethyl polyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxymetyl cellulose, acrylonitrile-styrene-butadiene copolymer and polyimide. The microporous separator is a polyolefin-based separator, or at least one porous substrate having a melting point of greater than or equal to 200 degrees C, selected from polyethylene terephthalate, polybutylene terephthalate, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyetherether ketone, polyether sulfone, polyphenylene oxide, polyphenylene sulfidro and polyethylene naphthalene. EXAMPLE - Polyvinylidene fluoride-hexafluoropropylene copolymer (PVdF-HFP polymer) was added to tetrahydrofuran (THF) in an amount of 5 wt.% and dissolved in it at stress corrosion cracking for greater than or equal to 12 hours to form a polymer solution. To the obtained polymer solution, BaTiO3 powder having a particle diameter of 400 nm was added with the concentration of 20 wt.% on the total solid content basis, and then dispersed to form a mixed solution (BaTiO3/PVDF-HFP=80:20 (wt. ratio)). Then, the obtained mixed solution was coated on a Teflon sheet by using a doctor blade coating method. After coating, THF was dried and the Teflon sheet was detached to obtain a final organic/inorganic composite porous film. The final film had a thickness of about 30 mu m. After measuring with a porosimeter, the final organic/inorganic composite porous film had a pore size of 0.4 mu m and a porosity of 60%.