NOVELTY - The non-aqueous electrolyte secondary battery contains anode, cathode containing active material which can occlude-discharge lithium, non-aqueous electrolyte and isolation film (4). The anode comprises mixture of active material (A) containing lithium complex oxide and active material (B) containing lithium-nickel-manganese complex oxide. The electrolyte contains lithium salt dissolved in mixture of cyclic carbonate and linear carbonate.    USE - Used as power supply for portable electronic device, industrial main power supply, main power supply of non-commercial mobile tools such as mobile telephone and notebook computer, and of power tools such as electrically driven driver and motor vehicles.    ADVANTAGE - The non-aqueous electrolyte secondary battery has excellent reliability and favorable discharge characteristics even after preserving at high temperature.    DETAILED DESCRIPTION - The non-aqueous electrolyte secondary battery contains anode, cathode containing active material which can occlude-discharge lithium, non-aqueous electrolyte and isolation film. The anode comprises mixture of active material (A) containing lithium complex oxide and active material (B) containing lithium-nickel-manganese complex oxide. The electrolyte contains lithium salt dissolved in mixture of cyclic carbonate and linear carbonate. The active material (A) is of formula: LixCoO2 and the active material (B) is of formula: LixNiyMnzM1-y-zO2, where x is 0.9-1.2, y is 0.1-0.5, z is 0.2-0.5, 1-y-z is 0.2-0.5, y/z is 0.9-3 and M is cobalt, magnesium, aluminum, titanium, strontium, calcium, vanadium, iron, yttrium, zirconium, molybdenum, technetium, ruthenium, tantalum, tungsten or rhenium. The anode further contains active material (C) containing lithium complex oxide of formula: LixCo1-yMyO2, where x is 0.9-1.2, y is 0.005-0.1 and M is magnesium, aluminum, titanium, strontium, calcium, vanadium, iron, yttrium, zirconium, molybdenum, technetium, ruthenium, tantalum, tungsten, rhenium, manganese, nickel, ytterbium, copper, zinc or barium. The cyclic carbonate is chosen from ethylene carbonate, propylene carbonate and butylene carbonate. The linear carbonate is dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, di-n-propyl carbonate, methyl-n-propyl carbonate, ethyl-n-propyl carbonate, methyl-i-propyl carbonate or ethyl-i-propyl carbonate, preferably mixture of diethyl carbonate and ethyl methyl carbonate. The lithium salt is lithium perchlorate, lithium hexafluoro phosphate, lithium tetrafluoro borate, lithium trifluoro methyl sulfonate, lithium trifluoro methyl sulfonyl amide, lithium pentafluoro ethyl sulfonyl amide, lithium trifluoro methyl sulfonyl carbide or lithium (trifluoro methyl sulfonyl) (nonafluoro butyl sulfonyl)amide, preferably mixture of lithium hexafluoro phosphate and lithium tetrafluoro borate. The non-aqueous electrolyte further contains cyclic ester chosen from vinylene carbonate, vinyl ethylene carbonate, gamma-butyrolactone and gamma-valerolactone, and ethylene sulfite, 1,3-propane sultone, sulfolane, tetrahydrofuran sulfite and sulfolene.    DESCRIPTION OF DRAWING(S) - The figure shows the expanded sectional view of non-aqueous electrolyte secondary battery.    Anode plate (2)    Cathode plate (3)    Isolation film (4)    Electrode group (5)    Battery case (6)