| 摘要 |
A cathode active material for a lithium-ion secondary battery includes a spinel lithium manganese composite oxide expressed by the general formula: Li<SUB>a</SUB>(Ni<SUB>x</SUB>Mn<SUB>2-x-q-r</SUB>Q<SUB>q</SUB>R<SUB>r</SUB>)O<SUB>4</SUB>, wherein 0.4<=x<=0.6, 0<q, 0<=r, x+q+r<2, 0<a<1.2, Q is at least one element selected from the group consisting of Na, K and Ca, and R is at least one element selected from the group consisting of Li, Be, B, Mg and Al.
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