| 摘要 |
It is to provide a positive electrode active material for a lithium secondary battery, which has a large volume capacity density and high safety, is excellent in uniform coating properties and is excellent in the charge and discharge cyclic durability and low temperature characteristics even at a high charge voltage. A process for producing a lithium-containing composite oxide represented by the formula Li<SUB>p</SUB>Q<SUB>q</SUB>N<SUB>x</SUB>M<SUB>y</SUB>O<SUB>z</SUB>F<SUB>a </SUB>(wherein Q is at least one element selected from the group consisting of titanium, zirconium, niobium and tantalum, N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than the Q element and the N element, 0.9<=p<=1.1, 0<q<=0.03, 0.97<=x<1.00, 0<=y<0.03, 1.9<=z<=2.1, q+x+y=1 and 0<=a<=0.02) from a lithium source, an Q element source and an N element source, and if necessary, at least one source selected from the group consisting of an M element source and a fluorine source, characterized by using as the Q element source an Q element compound aqueous solution having a pH of from 0.5 to 11.
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