Patent ID: 8709656

Claim:
A cathode material for a lithium ion secondary battery, comprising: a first cathode active substance represented by a compositional formula: Li x1 Ni a1 Mn b1 Co c1 O 2 (in which 0.2≦x1≦1.2, 0.6≦a1≦0.9, 0.05≦b1≦0.3, 0.05≦c1≦0.3, and a1+b1+c1=1.0); and a second cathode active substance represented by a compositional formula: Li x2 Ni a2 Mn b2 CO c2 M d O 2 (in which 0.2≦x2≦1.2, 0.7≦a2≦0.9, 0.05≦b2≦0.3, 0.05≦c2≦0.3, M=Mo, W, 0≦d≦0.06, and a2+b2+c2+d=1.0), wherein an amount of the first cathode active substance contained in the cathode material is set to 30 to 70% by mass.