NOVELTY - A positive electrode consists of positive electrode collector (12) and positive-electrode-active-material layer (15) formed on positive electrode collector, and has rated capacity of 3 Ah or more. The ratio of battery area with respect to rated capacity is 5 cm2/Ah or more. The active-material layer contains active material including spinel lithium-manganese composite oxide and lithium-nickel composite oxide. The ratio of average secondary particle diameter of lithium-nickel composite oxide and average secondary particle diameter of spinel lithium-manganese composite oxide is 0.5-2.    USE - Positive electrode is used for non-aqueous electrolyte secondary battery (claimed) e.g. lithium-ion secondary battery. Uses include but are not limited to mobile telephone, portable apparatuses, hybrid vehicle, electric vehicle and fuel cell electric vehicle.    ADVANTAGE - The positive electrode provides nonaqueous electrolyte secondary battery with excellent cycle characteristics and high capacity.    DETAILED DESCRIPTION - A positive electrode consists of positive electrode collector and positive-electrode-active-material layer formed on positive electrode collector, and has a rated capacity of 3 Ah or more. The ratio of battery area (projected area of the battery including a battery casing) with respect to rated capacity is 5 cm2/Ah or more. The positive-electrode-active-material layer contains positive electrode active material including spinel lithium-manganese composite oxide and lithium-nickel composite oxide. The ratio of average secondary particle diameter of lithium-nickel composite oxide and average secondary particle diameter of spinel lithium-manganese composite oxide is 0.5-2. The ratio of content of lithium-nickel composite oxide with respect to total content of lithium-nickel composite oxide and spinel lithium-manganese composite oxide is 0.2 or more. An INDEPENDENT CLAIM is included for nonaqueous electrolyte secondary battery.    DESCRIPTION OF DRAWING(S) - The drawing shows cross-sectional schematic view of lithium-ion secondary battery.    Lithium-ion secondary battery (10)    Anode collector (11)    Positive electrode collector (12)    Negative electrode collector (13)    Positive-electrode-active-material layer (15)