NOVELTY - A non-aqueous electrolyte battery has positive electrode (21), negative electrode (22) containing negative electrode active material which dope and dedope lithium, and non-aqueous electrolyte. The positive electrode contains lithium metal phosphate compound with olivine-type crystal structure represented by specific compositional formula. The negative electrode active material contains inorganic oxide nanoparticles having median particle size of 30 nm or less.    USE - Non-aqueous electrolyte battery is used for mobile telephone, notebook personal computer, electric vehicle and power tool such as electric drill.    ADVANTAGE - The non-aqueous electrolyte battery is safe and has high output, capacitance, excellent durability and charging and discharging characteristic. The power tool and electric vehicle excellent in durability is provided economically.    DETAILED DESCRIPTION - A non-aqueous electrolyte battery has positive electrode, negative electrode containing negative electrode active material which dope and dedope lithium, and non-aqueous electrolyte. The positive electrode contains lithium metal phosphate compound with olivine-type crystal structure represented by following compositional formula: LiFe1-yMyPO4, where M is metallic element chosen from manganese, cobalt, nickel, magnesium, zinc, chromium, titanium and vanadium, and y is 0-0.8. The negative electrode active material contains inorganic oxide nanoparticles having median particle size of 30 nm or less. The inorganic oxide nanoparticles are chosen from alumina, silica, zirconia and titania. The negative electrode active material is chosen from graphitized carbon, easily graphitized carbon, artificial graphite and/or amorphous alloy-carbon compound-type material.    DESCRIPTION OF DRAWING(S) - The drawing shows sectional view of non-aqueous electrolyte secondary battery. (Drawing includes non-English language text).    Battery can (11)    Thermal-sensitive resistive element (16)    Positive electrode (21)    Negative electrode (22)    Separator (23)