NOVELTY - A nonaqueous electrolyte secondary battery consists of a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode comprises a lithium fluorosulfate having a triplite crystal structure, as positive-electrode active material (I), and lithium fluorosulfate having a tavorite crystal structure, as positive-electrode active material (II). The negative electrode comprises an active material containing lithium titanium oxide, titanium oxide, niobium titanium complex oxide, and/or carbon material.    USE - Nonaqueous electrolyte secondary battery e.g. lithium ion secondary battery, is used for forming battery packs (claimed). Uses include but are not limited to electric vehicles, hybrid electric vehicles, motor vehicles, two-wheeled vehicles, four-wheeled vehicles, electrical-power-assisted bicycles, and portable electronic devices.    ADVANTAGE - The nonaqueous electrolyte secondary battery uses a positive-electrode active material which provides high output with low charge depth. The battery has excellent cycle characteristics.    DETAILED DESCRIPTION - A nonaqueous electrolyte secondary battery consists of a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode comprises a lithium fluorosulfate of formula: LiMSO4F, where M is iron, manganese and/or zinc, having a triplite crystal structure, as positive-electrode active material (I), and lithium fluorosulfate of formula: LiM'SO4F, where M' is iron, manganese and/or zinc, having a tavorite crystal structure, as positive-electrode active material (II). The negative electrode comprises an active material containing lithium titanium oxide, titanium oxide, niobium titanium complex oxide, and/or carbon material.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a flat-type nonaqueous electrolyte secondary battery.    Electrode group (1)    Exterior component (2)    Negative-electrode terminal (6)    Positive-electrode terminal (7)