| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium nickel composite oxide for a positive electrode active material for lithium secondary battery with high initial capacity. <P>SOLUTION: The lithium nickel composite oxide, composed of spherical secondary particles with an average particle diameter of 5-15 μm, of which, Li seat occupancy of Li site in the crystal measured by Rietveld analysis is not less than 98%, is expressed by a general formula Li<SB>X</SB>(Ni<SB>1-y</SB>Co<SB>y</SB>)<SB>1-Z</SB>M<SB>Z</SB>O<SB>2</SB>(0.98≤X≤1.10, 0.05≤Y≤0.4, M is not less than one kind of Al, Z, Ti and Mg). It is preferable that the difference between the specific surface area before water flushing treatment and that after water flushing treatment is 1.0 m<SP>2</SP>/g or less. <P>COPYRIGHT: (C)2004,JPO |
