| 摘要 |
PROBLEM TO BE SOLVED: To provide a positive electrode active material for a lithium ion secondary battery having superior rate characteristics and cyclic characteristics, and a manufacturing method therefor. SOLUTION: Lithium carbonate having a particle diameter of 1 to 40 μm, a mean particle diameter of 5 to 15 μm, and a single peak on the Rosin- Rammler grain size distribution chart is mixed with cobalt oxide (Co3O4) having a mean particle diameter and the maximum particle diameter smaller than those of the lithium carbonate. The resulting mixture is mixed with a medium for granulation, drying and burning at the given temperature to obtain powdered lithium cobalite of a general formula LiCoO2 having a single peak in its grain size distribution on the Rosin-Rammler grain size distribution chart, and preferably, the particle diameter of most of the powdered lithium cobaltite in the range of 1 to 40 μm, and a mean particle diameter of 5 to 15 μm. |
