TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Material: The inorganic material is silica, talc, alumina, gamma-lithium aluminate, titanium dioxide, zeolite, molybdenum phosphate hydrate or tungsten phosphate hydrate. The electrolyte solution comprises lithium salt from lithium perchlorate, lithium triflate, lithium hexafluorophosphate, lithium tetrafluoroborate or lithium trifluoromethanesulfonylimide.Preferred Composition: The inorganic material is added in an amount of 1-100 wt.% based on the total weight of the polymer of the second porous matrix. The lithium salt is dissolved in the electrolyte solution at 1-200 wt.% based on the total weight of the polymer of the first polymer matrix and the second polymer matrix.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Material: The inorganic material is silica, talc, alumina, gamma-lithium aluminate, titanium dioxide, zeolite, molybdenum phosphate hydrate or tungsten phosphate hydrate. The electrolyte solution comprises lithium salt from lithium perchlorate, lithium triflate, lithium hexafluorophosphate, lithium tetrafluoroborate or lithium trifluoromethanesulfonylimide.Preferred Composition: The inorganic material is added in an amount of 1-100 wt.% based on the total weight of the polymer of the second porous matrix. The lithium salt is dissolved in the electrolyte solution at 1-200 wt.% based on the total weight of the polymer of the first polymer matrix and the second polymer matrix.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The electrolyte solution is made of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methylethyl carbonate, tetrahydrofuran, 2-methyltetrahydrofuran, dimethoxyethane, methyl formate, ethyl formate and/or gamma-butyrolactone. The co-solvent is ethanol, methanol, isopropyl alcohol, acetone, dimethylformamide, dimethylsulfoxide, and/or N-methylpyrrolidone.    TECHNOLOGY FOCUS - POLYMERS - Preferred Material; The first porous polymer film is made of polyethylene, polypropylene, polyimide, polysulfone, polyurethane, PVC, cellulose, nylon, polyacrylonitrile, polyvinylidene fluoride, polytetrafluoroethylene and/or its copolymer. The second porous polymer film is made of vinylidene fluoride based polymer, an acrylate based polymer and/or its copolymer. It is also made of a copolymer of vinylidene fluoride and hexafluoropropylene, a copolymer of vinylidene fluoride and trifluoroethylene, a copolymer of vinylidene fluoride and tetrafluoroethylene, polymethylacrylate, polyethylacrylate, polymethylmethacrylate, polyethylmethacrylate, polybutylacrylate, polybutylmethacrylate, polyvinylacetate, polyethylene oxide, polypropylene oxide and/or its copolymer.Preferred Property: The first polymer film has a thickness of 10-25 microns and the second polymer film has a thickness of 0.5-10 microns.Preferred Composition: The electrolyte solution is impregnated into the first and second polymer films at 1-1000 wt.% based on the total weight of the polymer of the first and second polymer films.Preferred Component: The second porous polymer film comprises an inorganic material.