A cathode active material for a lithium-ion secondary battery includes a spinel lithium manganese composite oxide expressed by the general formula: Lia(NixMn2-x-q-rQqRr)O4, wherein 0.4x0.6, 0q, 0r, x+q+r2, 0a1.2, 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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> Manganese, bismuth mixed metal oxide cathode for rechargeable lithium electrochemical systems
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