NOVELTY - The battery has a separation film i.e. freestanding-type separation film, located between an anode and a cathode. A gap formed between the anode and the cathode is filled with nonaqueous liquid electrolyte that comprises compositional component and ionomer. Average molecular weight of the ionomer is 240-200,000. The anode comprises anode active material coating composition and anode mixture component. The cathode comprises cathode active material coating composition and cathode mixture component. The nonaqueous liquid electrolyte comprises electrolyte salt and non-aqueous organic solvent.    USE - Secondary lithium battery for use as an energy source of an electric vehicle and an electronic device e.g. mobile phone, camcorder and notebook computer.    ADVANTAGE - The gap formed between the anode and the cathode is filled with the nonaqueous liquid electrolyte that comprises the compositional component and the ionomer so as to improve ionic conductivity, mechanical property, transition metal elution protection effect and stability of a secondary battery at a high-temperature/high-voltage environment.    DETAILED DESCRIPTION - The electrolyte salt is transmitted salt that is lithium, phosphorus fluoride, boron fluoride, chloride, bromide, iodide, carbon monoxide, carbon fluoride, sulfur oxide or potassium. The nonaqueous liquid electrolyte comprises non-aqueous organic solvent that comprises organic solvent. The organic solvent is cyclic carbonate compound, linear carbonate compound, lactone i.e. gamma-butyrolactone, ether compound, ester compound, sulfoxide i.e. dimethyl sulphoxide, lactam i.e. N-methypyrrolidone, or ketone i.e. polymethyl vinyl ketone. The cyclic carbonate is ethylene carbonate, propylene carbonate, butylene carbonate or fluoroethylene carbonate. The linear carbonate compound is diethyl carbonate, dimethyl carbonate, dipropyl carbonate, ethylmethyl carbonate or methylpropyl carbonate. The ether compound is dibuthyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, 1,2-dimethoxyethane or 1,2-diethoxyethane. The ester compound is ethyl formate, ethyl formate, profile formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate or butylpropionate.    DESCRIPTION OF DRAWING(S) - The drawing shows a graphical view illustrating relationship between cycle life and capacity of a secondary lithium battery.'(Drawing includes non-English language text)'    High-voltage cycle life improvement 5V class (AA)    Comparative example (BB)    Capacity of battery (DD)    Cycle life of battery (EE)    45 degrees cycle life of a battery (FF)