NOVELTY - A lithium ion secondary battery comprises a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode contains lithium-transition metal composite oxide having layered structure as positive electrode active material. The positive electrode active material contains metal element (M) chosen from nickel, cobalt and manganese, and metal element (M') chosen from zirconium, niobium and aluminum, and tungsten.    USE - Lithium ion secondary battery is used for motor vehicles (claimed) e.g. hybrid vehicle and electric vehicle.    ADVANTAGE - The lithium ion secondary battery has excellent output characteristics and cycling characteristics, and is safe to use.    DETAILED DESCRIPTION - A lithium ion secondary battery comprises a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode contains lithium-transition metal composite oxide having layered structure as positive electrode active material. The positive electrode active material contains metal element (M) chosen from nickel, cobalt and manganese, and metal element (M') chosen from zirconium, niobium and aluminum, and tungsten. The amount of tungsten eluted into the filtrate obtained by filtering suspension obtained by dissolving 2 g of powder of positive electrode active material in 100 g of pure water is 0.025 mmol or less/1 g of the filtrate as measured by inductively coupled plasma mass spectrometry. An INDEPENDENT CLAIM is included for manufacture of positive electrode active material. An aqueous solution containing element (M) and element (M') and an aqueous solution containing tungsten are mixed in alkaline condition. Then, element (M') and tungsten are deposited. The hydroxide and lithium compound are added to the mixture, mixed and baked, to obtain lithium-transition metal composite oxide.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of lithium ion secondary battery.    Case (10)    Cover (14)    Positive electrode terminal (38)    Negative electrode terminal (48)