NOVELTY - A non-aqueous electrolyte battery consists of a positive electrode (3), a negative electrode (4), a separator (5), and a non-aqueous electrolyte. The positive electrode contains active-material particles. The coating in the surface of active-material particles consists of particles containing magnesium, titanium, zirconium, barium, boron and/or carbon. The electrolyte contains lithium salt dissolved in a mixed solvent containing propylene carbonate and/or ethylene carbonate, and non-aqueous solvent having a nitrile group, and gamma -butyrolactone.    USE - Non-aqueous electrolyte battery is used for battery packs (claimed) used as power supply for motor vehicles, digital cameras, hybrid electric vehicles, and rechargeable vacuum cleaners.    ADVANTAGE - The non-aqueous electrolyte battery has excellent high-temperature durability.    DETAILED DESCRIPTION - A non-aqueous electrolyte battery consists of a positive electrode, a negative electrode, a separator arranged between the electrodes, and a non-aqueous electrolyte. The positive electrode contains active-material particles having an average particle diameter of 0.1-10 mu m. The coating existing in the surface of active-material particles consists of particles containing magnesium, titanium, zirconium, barium, boron and/or carbon and having an average particle diameter of 60 nm or less. The layer thickness is 60 nm or less. The negative electrode contains a metallic compound which occludes a lithium ion above 0.4 V (vs. Li/Li+). The non-aqueous electrolyte contains a lithium salt dissolved in a mixed solvent. The mixed solvent contains non-aqueous solvent (I) consisting of propylene carbonate and/or ethylene carbonate, and 10-70 vol.% of non-aqueous solvent (II) having a molecular weight of 40-100 and a nitrile group, and gamma -butyrolactone. The positive-electrode active-material particles contain lithium-metal oxide of formula: LixM1yO2, LizM22wO4 or LisM3tPO4, where M1-M3 is manganese, nickel, cobalt and/or iron, x, z and s are greater than 0 to 1.1 or less, and y, w and t are 0.8-1.1. The positive-electrode active-material particles preferably contain LixCoO2, LixNi1-b-cMnbCocO2, LizMn2O4, LizMn2-eNieO4, or LisFePO4, where b is 0.1-0.5, c is 0-0.5, and e is 0.3-0.8. The non-aqueous solvent having nitrile group is acetonitrile, propionitrile, methoxyacetonitrile, and/or 3-methoxypropionitrile. The metallic compound of negative electrode is lithium-titanium oxide or titanium oxide.    DESCRIPTION OF DRAWING(S) - The drawing shows a partially notched sectional view of the non-aqueous electrolyte battery.    Positive electrode (3)    Negative electrode (4)    Separator (5)    Sealing board (10)    Insulation component (11)