| 摘要 |
To provide a process for producing a lithium-cobalt composite oxide for a positive electrode of a lithium secondary battery, which has a large volume capacity density, high safety, high charge and discharge cycle durability, high press density and high productivity. A process for producing a lithium-cobalt composite oxide represented by the formula Li<SUB>p</SUB>Co<SUB>x</SUB>M<SUB>y</SUB>O<SUB>z</SUB>F<SUB>a </SUB>(wherein M is a transition metal element other than Co, or an alkaline earth metal element, 0.9<=p<=1.1, 0.980<=x<=1.000, 0<=y<=0.02, 1.9<=z<=2.1, x+y=1, and 0<=a<=0.02), characterized in that as a cobalt source, a mixture is used which comprises cobalt hydroxide in the form of substantially spherical secondary particles with an average particle size of from 8 to 20 mum formed by agglomeration of primary particles and tricobalt tetroxide in the form of secondary particles with an average particle size of from 2 to 10 mum formed by agglomeration of primary particles, in a cobalt atomic ratio of from 5:1 to 1:5, and firing is carried out at from 700 to 1,050° C.
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