NOVELTY - A non-aqueous electrolyte battery consists of positive electrode (1), negative electrode (2) and non-aqueous electrolyte. The non-aqueous electrolyte contains the fluoride of an ether derivative (1).    USE - Used as electric power unit of portable apparatus such as mobile telephone, small computer, and electric power unit for electric power storage of electric vehicles.    ADVANTAGE - The fluoride of ether derivative decomposes during over charging, and polymer formed during the process forms protective film on electrode surface, raising the internal resistance of battery. Stability of battery is ensured during over charging. Since the polymer produced from fluoride of ether derivative does not undergo re-dissolution easily in non-aqueous electrolyte, the decomposition of other organic solvent which comprises the electrolyte is effectively suppressed. As the fluoride of ether derivative is fluorinated, the oxidation potential is high and does not exert bad influence on low temperature property of the battery and battery preservability. Non-aqueous electrolyte secondary battery having high charging and discharging efficiency and high energy density is provided. The cyclic carbonate which does not having pi-bond, contained in the electrolyte further raises the stability and energy density of the battery. The organic solvent used for non-aqueous electrolyte is excellent in oxidation resistance. The battery has high operation voltage. The metal resin composite material used for exterior material of battery is thin and lightweight.    DETAILED DESCRIPTION - A non-aqueous electrolyte battery consists of positive electrode, negative electrode and non-aqueous electrolyte. The non-aqueous electrolyte contains the fluoride of an ether derivative of formula (I):    n = 0-2;    X1-X5 = hydrogen, fluorine, 1-6C alkyl or 1-6C fluoroalkyl group; and    Y1 = 1-6C alkyl, 1-6C fluoroalkyl, phenyl, aryl, alkyl phenyl group or its derivative(s).    DESCRIPTION OF DRAWING(S) - The figure shows the sectional view of the non-aqueous electrolyte battery.    Positive electrode (1)    Negative electrode (2)    Metal resin composite film (5)    Anode mix (11)    Positive electrode collector (12)    Cathode mix (21)