| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a positive electrode material for a lithium ion secondary battery with high capacity and high energy density having high voltage of 4.5 V or more vs. Li. <P>SOLUTION: This positive active material contains a spinel lithium manganese composite oxide represented by general formula (1), Li<SB>a</SB>(M<SB>x</SB>Mn<SB>2-x-y</SB>A<SB>y</SB>)O<SB>4</SB>(1) (In the formula, 0.4<x; 0<y; x+y<2; 0<a<1.2. M is selected from a group comprising Ni, Co, Fe, Cr, and Cu and contains at least one metal element containing at least Ni. A contains at least one metal element selected from Si and Ti. If A contains only Ti, a value of ratio y of A is 0.1<y.). <P>COPYRIGHT: (C)2003,JPO |
