| 摘要 |
A non-aqueous electrolyte secondary battery uses as its positive electrode active material a mixture of a first lithium-containing transition metal oxide containing nickel and manganese as transition metals and having a crystal structure belonging to the space group R3m and a second lithium-containing transition metal oxide containing nickel, cobalt, and manganese as transition metals and having a crystal structure belonging to the space group R3m, or a mixture of the first lithium-containing transition metal oxide and a lithium cobalt oxide. The first lithium-containing transition metal oxide is Li<SUB>a</SUB>Ni<SUB>x</SUB>Mn<SUB>y</SUB>O<SUB>2 </SUB>wherein 1<=a<=1.5, 0.5<=x+y<=1, 0<x<1, and 0<y<1. The second lithium-containing transition metal oxide is Li<SUB>b</SUB>Ni<SUB>p</SUB>Mn<SUB>q</SUB>Co<SUB>r</SUB>O<SUB>2 </SUB>wherein 1<=b<=1.5, 0.5<=p+q+r<=1, 0<p<1, 0<q<1, and 0<r<1.
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