| 摘要 |
A lithium ion secondary battery according to the present invention uses a cathode material obtained by mixing a first cathode active substance represented by a compositional formula: Lix1Nia1Mnb1COc1O2 (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: Lix2Nia2Mnb2COc2MdO2 (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). |
