NOVELTY - A nonaqueous electrolyte secondary battery (100) consists of a positive electrode (10), a negative electrode (20), and a nonaqueous electrolyte (90). The positive electrode contains particles containing lithium-transition metal compound as basic composition. The particles consist of center region containing the basic composition, covered with an outer region. The outer region does not include transition metal(s) contained in the basic composition, or concentration of transition metal is lower than the basic composition.    USE - Nonaqueous electrolyte secondary battery e.g. lithium ion secondary battery, is used for vehicles (claimed) e.g. car. Uses include but are not limited to hybrid vehicles, plug-in hybrid motor vehicles, electric vehicles, fuel-cell electric vehicles, electric wheelchairs, and electric-power-assisted bicycles.    ADVANTAGE - The nonaqueous electrolyte secondary battery has excellent durability and high energy density. Elution of metallic element from the positive-electrode active material is suppressed.    DETAILED DESCRIPTION - A nonaqueous electrolyte secondary battery consists of a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode contains particles containing lithium-transition metal compound as basic composition, as active material. The operation upper limit electric potential is 4.5 V or more by metallic lithium reference. The particles consist of center region containing the basic composition, covered with an outer region. The outer region does not include transition metal(s) contained in the basic composition, or concentration of transition metal is lower than the basic composition. The nonaqueous electrolyte contains a transition-metal ion-trapping agent. An INDEPENDENT CLAIM is included for manufacture of nonaqueous electrolyte secondary battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the external shape of the nonaqueous electrolyte secondary battery.    Positive electrode (10)    Negative electrode (20)    Battery case (50)    Nonaqueous electrolyte (90)    Nonaqueous electrolyte secondary battery (100)