TECHNOLOGY FOCUS - IMAGING AND COMMUNICATION - Preferred Arrangements: The lithium-polymer secondary battery has gel-polymer electrolyte, separator, cathode and anode.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Property: The particle diameter of inorganic particles is 10-2000 nm. Preferred Composition: The inorganic particles are oxide and fluoride of silicon, tin, germanium, chromium, aluminum, manganese, nickel, zinc, titanium, cobalt, indium, cadmium, bismuth, lead and vanadium.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The reactive functional group is a group in which polymerization reaction is possible. The reactive functional group is vinyl group. The inorganic particle raw material having reactive functional group is vinyltrimethoxysilane and/or vinyltriethoxysilane. The crosslinking agent comprises 2 or more functional groups. The content of crosslinking agent is 0.1-10 wt.%. The initiator is t-amyl peroxide, benzoyl peroxide, and azobis compound. The liquid electrolyte comprises lithium perchlorate, lithium hexafluorophosphate, lithium trifluoromethanesulfonate, lithium bis(trifluoromethylsulfonyl imide), lithium tetrafluoroborate, or its salt in mixed solvent comprising ethylene carbonate, dimethyl carbonate, diethyl carbonate, propylene carbonate, ethyl methyl carbonate, gamma -butyrolactone, dimethoxyethane, 2-methyltetrahydrofuran.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The material comprises polyolefin resin, fluorine-based resin, polyester-type resin, polyacrylonitrile, cellulose-based resin and nonwoven fabric. The coating layer further comprises binder. The binder is chosen from polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyvinyl acetate, polyethylene oxide, polymethylmethacrylate, polyvinyl chloride, polyurethane, polyacrylonitrile, ethylene-vinyl acetate copolymer, carboxymethyl cellulose and polyimide. The weight ratio of binder and inorganic material is 1/99-99/1. The content of binder and inorganic particle solution is 1-30 wt.%.