TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The active material of polarity electrodes (p1) contains natural graphite, artificial graphite, carbonaceous material, lithium-containing titanium complex oxide, oxide or alloy of metal chosen from silicon, tin, lithium, zinc, magnesium, cadmium, cerium, nickel and iron. The active material of polarity electrodes (p2) contains lithium-cobalt oxide, lithium-nickel oxide, lithium-manganese oxide, lithium-cobalt phosphate, lithium-iron phosphate, lithium-nickel-manganese-cobalt oxide or lithium-nickel-cobalt oxide (LiNi1-x-y-zCoxM1yM2zO2), where M1 and M2 are aluminum, nickel, cobalt, iron, manganese, vanadium, chromium, titanium, tungsten, tantalum, magnesium and/or molybdenum, x, y and z are 0 to less than 0.5 and x+y+z is 1. The current collectors of polarity electrodes (p1) and electrodes (p2) contain stainless steel, stainless steel which is surface treated by aluminum, nickel, titanium, plastic carbon, copper, nickel, titanium or silver, aluminum-cadmium alloy, surface-treated non-conductive polymer or conductive polymer. The electrolyte layer contains gel-type polymer electrolyte comprising polyethylene oxide, polyvinylidene difluoride, poly(methyl methacrylate) polyacrylonitrile and/or polyvinyl acetate, or solid polymer comprising polypropylene oxide, polyethylene imide, polyethylene sulfide or polyvinyl acetate, and further contains lithium salt chosen from lithium chloride, lithium bromide, lithium iodide, lithium chlorate, lithium tetrafluoroborate, lithium boron chloride, lithium hexafluorophosphate, lithium trifluoromethanesulfonate, lithium trifluoroacetate, lithium hexafluoroarsenate, lithium hexafluroantimonate, lithium tetrachloroaluminate, lithium methanesulfonate, lithium trifluoromethanesulfonate, lithium chloroboarate, lower aliphatic lithium carbonate, 4-phenyl lithium borate and lithium (bis)trifluoromethanesulfonate imide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The conductive polymer is polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfonitride, indium tin oxide, copper, silver, palladium and/or nickel. The separation film of secondary battery is micro porous membrane comprising polyethylene film and/or polypropylene film, or multilayer film containing polyvinylidene fluoride, polyethylene oxide, poly(acrylonitrile), or polyvinylidene fluoride-hexafluoropropylene copolymer.