| 摘要 |
To provide a lithium-nickel-cobalt-manganese composite oxide powder for a positive electrode of a lithium secondary battery, which has a large volume capacity density and high safety and is excellent in the charge and discharge cyclic durability. A positive electrode active material powder for a lithium secondary battery characterized by comprising a first granular powder having a compression breaking strength of at least 50 MPa and a second granular powder having a compression breaking strength of less than 40 MPa, formed by agglomeration of many fine particles of a lithium composite oxide represented by the formula Li<SUB>p</SUB>Ni<SUB>x</SUB>Co<SUB>y</SUB>Mn<SUB>z</SUB>M<SUB>q</SUB>O<SUB>2-a</SUB>F<SUB>a </SUB>(wherein M is a transition metal element other than Ni, Co and Mn, Al or an alkaline earth metal element, 0.9<=p<=1.1, 0.2<=x<=0.8, 0<=x<=0.4, 0<=z<=0.5, y+z>0, 0<=q<=0.05, 1.9<=2-a<=2.1, x+y+z+q=1, and 0<=a<=0.02) to have an average particle size D50 of from 3 to 15 mum, in a weight ratio of the first granular powder/the second granular powder being from 50/50 to 90/10.
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