NOVELTY - A non-aqueous electrolyte secondary battery has negative electrode, a non-aqueous electrolyte, isolation film (4) and positive electrode. The active material of positive electrode is obtained by mixing an active material (al) and an active material (a2). The active material (al) and active material (a2) contain lithium complex oxide. The non-aqueous electrolyte contains lithium salt mixed in solvent chosen from cyclic carbonate such as ethylene carbonate, propylene carbonate and/or butylene carbonate, and linear carbonate such as dimethyl carbonate and/or diethyl carbonate.    USE - Non-aqueous electrolyte secondary battery is used for portable electronic device such as mobile telephone and notebook computer, electrically-driven driver and motor vehicle.    ADVANTAGE - The non-aqueous electrolyte secondary battery has excellent capacitance, charge-and-discharge characteristics, durability, cycling characteristics and reliability at high temperature.    DETAILED DESCRIPTION - A non-aqueous electrolyte secondary battery has a negative electrode having occlusion and a dischargable active material for lithium, a non-aqueous electrolyte, an isolation film and a positive electrode. The active material of the positive electrode is obtained by mixing an active material (al) and an active material (a2). The active material (al) contains lithium complex oxide (LixCoO2), where x is 0.9-1.2. The active material (a2) contains lithium complex oxide (LixNiyCozM1-y-zO2), where y is 0.3-0.9, z is 0.05-0.5, 1-y-z is 0.01-0.3 and M is magnesium, barium, aluminum, titanium, strontium, calcium, vanadium, iron, copper, bismuth, yttrium, zirconium, molybdenum, technetium, ruthenium, tantalum, tungsten, and/or rare earth metal. The non-aqueous electrolyte contains a lithium salt mixed in a solvent chosen from cyclic carbonate such as ethylene carbonate, propylene carbonate and/or butylene carbonate, and linear carbonate such as dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, di-n-propyl carbonate, methyl-n-propyl carbonate, ethyl-n-propyl carbonate, methyl-i-propyl carbonate and/or ethyl-i-propyl carbonate, and dissolved in lithium perchlorate, lithium hexafluorophosphate, lithium tetrafluoroborate, lithium triflate, lithium bis(trifluoromethanesulfonimide), lithium bis(perfluoroethylsulfonimide), lithium trifluoromethyl sulfonyl nonafluoro butylsulfoimide and/or lithium tri(trifluoromethenesulfonyl)methene.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of the non-aqueous electrolyte secondary battery.    Positive electrode plate (2)    Negative electrode plate (3)    Isolation film (4)    Negative electrode terminal (7)    Sealing board (8)