TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The cation is one of a quaternary amine or cyclic amine. The quaternary amine is tetraalkyl ammonium cation or tri-ethyl-methyl ammonium cation. The anion of the normal temperature fused salt is amide anion which is CF3CON-SO2CF3, N-(SO2C2F5)2, or N-(SO2CF3)2.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The cation is one of a quaternary amine or cyclic amine. The quaternary amine is tetraalkyl ammonium cation or tri-ethyl-methyl ammonium cation. The anion of the normal temperature fused salt is amide anion which is CF3CON-SO2CF3, N-(SO2C2F5)2, or N-(SO2CF3)2.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The film forming material is one of ethylene carbonate compound, dioxane compound, polyacrylate compound, aziridine compound and/or silane compound. The ethylene carbonate compound is 1 or more of compound of ethylene carbonate, mono-fluoro ethylene carbonate, difluoro ethylene carbonate, trifluoro ethylene carbonate, tetrafluoro ethylene carbonate and vinylene carbonate. The dioxane compound is 1,3-dioxane. The aziridine compound comprises aziridine ring of 3 or more.    TECHNOLOGY FOCUS - POLYMERS - Preferred Compound: The polyacrylate compound is 1 or more of polyethyleneglycol diacrylate, polyethylene glycol dimethacrylate, tripoly ethylene glycol triacrylate and dipentaerythritol. The silane compound is triacetoxy vinyl silane. EXAMPLE - Lithium hexafluoro phosphate (1.3 mol.L-1) was dissolved in mixed solvent of ethylene carbonate and diethylene carbonate in a volume ratio of 3:7, and compound of formula (((CH3)3C8H17N+)) (N-)(SO2CF3)2)) (10 wt.%) as normal temperature fused salt was added to the solution, and non-aqueous electrolyte was obtained. The obtained non-aqueous electrolyte was added to battery container containing pellet form anode containing lithium cobalt oxide as anode active material and pellet form cathode containing carbon fiber as cathode active material. Then the battery container was sealed, and coin shaped lithium secondary battery was manufactured. The obtained battery had favorable charging and discharging characteristic.