| abstract |
(57) [Problem] To provide lithium cobalt oxide having a large particle volume, a large particle size, and low sintering. SOLUTION: In an aqueous medium, a divalent cobalt compound, an alkali hydroxide, and an ammonium compound exhibiting alkalinity are reacted to obtain cobalt hydroxide, and then the obtained cobalt hydroxide is mixed with a lithium compound. After firing. Alternatively, in an aqueous medium, a divalent cobalt compound, an alkali hydroxide, is reacted with an ammonium compound exhibiting alkalinity to obtain cobalt hydroxide, and then, the obtained cobalt hydroxide is calcined to produce tricobalt tetroxide. Obtained, then, the obtained tricobalt tetroxide is mixed with a lithium compound and then fired. The lithium battery using the lithium cobaltate of the present invention as a positive electrode active material has a high initial discharge capacity, and also has excellent average charge / discharge efficiency and cycle characteristics of discharge capacity. |