Patent ID: 8021782

Claim:
A nonaqueous electrolyte secondary battery comprising: a positive electrode plate having a positive electrode active material capable of absorption and desorption of lithium ions; a negative electrode plate having a negative electrode active material capable of absorption and desorption of lithium ions; and a nonaqueous electrolyte, the positive electrode active material having a mixture of a material A and a material B, the material A being Li w Ni x Co y Mn z O 2 (where 1.00≦w≦1.30, x+y+z=1, 0.40≦x≦0.50, and 0.30≦y≦0.40) and the material B being Li w Ni x Co y Mn z O 2 (where 1.00≦w≦1.30, x+y+z=1, 0.30≦x≦0.35, and 0.30≦y≦0.35).