TECHNOLOGY FOCUS - POLYMERS - Preferred Preparation: The polymer matrix is fabricated by an electrospinning. The polymer electrolyte solution is prepared by stirring a mixture comprising polymer, plasticizer and organic electrolyte solution dissolving a lithium at 20-150 degreesC for 30 minutes to 24 hours.Preferred Property: The polymer has a diameter of 10-1000 nm. The polymer matrix has a thickness of 1-100 microns.Preferred Component: The polymer is polyethylene, polypropylene, cellulose, cellulose acetate, cellulose acetate butylate, cellulose acetate propionate, polyvinylpyrrolidonevinylacetate, poly(bis(2-(2-methoxyethoxyethoxy))phosphagene), polyethyleneimide, polyethyleneoxide, polyethylenesuccinate, polyethylenesulfide, poly(oxymethylene-oligo-oxyethylene), polypropyleneoxide, polyvinyl acetate, polyacrylonitrile, poly(acrylonitrile-co-methylacrylate), polymethylmethacrylate, poly(methylmethacrylate-co-ethylacrylate), polyvinylchloride, poly(vinylidenechloride-co-acrylonitrile), polyvinylidenedifluoride, poly(vinylidenefluoride-co-hexafluoropropylene), polyethylene glycol diacrylate, and/or polyethylene glycol dimethacrylate.The polymer electrolyte solution also includes a plasticizer from propylene carbonate, butylene carbonate, 1,4-butyrolactone, diethyl carbonate, dimethyl carbonate, 1,2-dimethoxyethane, 1,3-dimethyl-2-imidazolidinone, dimethylsulfoxide, ethylene carbonate, ethylmethyl carbonate, N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, polyethylene sulforane, tetraethylene glycol dimethyl ether, acetone, and/or alcohol.Preferred Composition: The polymer electrolyte also includes not more than 20 wt.% filling agent that can be a polytetrafluoroethylene. The weight ratio of the polymer to the plasticizer is 1:1-1:20. The weight ratio of the polymer to the organic solvent is 1:1-1:20.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The organic solvent is ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, and/or ethylmethyl carbonate. It also comprises methyl acetate, methyl propionate, ethyl acetate, ethyl propionate, butylenecarbonate, gamma-butylactone, 1,2-dimethoxyethane, dimethylacetamide, and/or tetrahydrofuran to improve a low-temperature characteristic.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The lithium salt is lithium phosphorus hexafluoride (LiPF6), lithium perchlorate, lithium arsenic hexafluoride (LiAsF4), lithium borofluoride (LiBF4), or LiCF3SO3. The filling agent is titanium dioxide, barium titanate, lithium oxide, lithium fluoride, lithium hydroxide, lithium nitride, barium oxide, sodium oxide, magnesium oxide, lithium carbonate, silicon oxide, aluminum oxide, and/or lithium aluminate. EXAMPLE - A polyvinylidenefluoride (20 g) was added to dimethylacetamide (DMA)(100 g) and stirred at room temperature for 24 hours to give a polymeric solution. The solution was filled into barrel and discharged in a plate to prepare a polymer electrolyte. Polyacrylonitrile (0.5 g), polyvinylidenedifluoride (2 g), and polymethylmethacrylate (0.5 g) were added to a mixture of 1M LiPF6 (15 g) and DMA solution (1 g), blended for 12 hours, and heated to 130 degreesC for 1 hour to give a polymer electrolyte solution. The solution was cast in the matrix to form a hybrid polymer electrolyte and inserted between a graphite anode and lithium cobaltite cathode, and the plates were cut and laminated. The plate was inserted into a vacuum casing, injected with 1M LiPF6 solution, and vacuum-sealed to form a lithium secondary battery. The battery showed an improved electrode capacities and cycle life.