Patent ID: 8802298

Claim:
A non-aqueous electrolyte secondary cell comprises: a positive electrode having a positive electrode active material; a negative electrode having a negative electrode active material; and a non-aqueous electrolyte having a non-aqueous solvent and an electrolyte salt, wherein the positive electrode active material contains a compound represented by Li a (Ni b Co c Mn d ) 1 − x − y W x Zr y O 2 (0.9≦a≦1.20.3≦b≦0.6, 0.1≦c≦0.7, 0≦d≦0.4, b+c+d= 1 , 0.001≦x≦0.05, 0.001≦y≦0.05); and the non-aqueous electrolyte contains at least one compound selected from the group consisting of cyclohexylbenzene, tert-butylbenzene and tert-amylbenzene in a total concentration of 0.1 to 5% by mass relative to the mass of the non-aqueous electrolyte.