| abstract |
[57] [Summary] [PROBLEMS] To provide a hexagonal lithium cobalt composite oxide for a lithium secondary battery that is excellent in terms of high-temperature storage stability, cycle characteristics, weight capacity density, volume capacity density, safety, and mass production. A novel manufacturing method is provided. SOLUTION: A cobalt oxyhydroxide powder having a weight average particle diameter of 1 to 20 μm and a specific surface area of 2 to 200 m 2 / g, a weight average particle diameter of 1 to 50 μm and a specific surface area of 0.1. 1-10 m 2 / g lithium carbonate powder is mixed, The mixture is fired in an oxygen-containing atmosphere, the weight average particle diameter is 5 to 15 μm, and the specific surface area is 0.15 to 0.60 m 2. / G, a hexagonal lithium cobalt composite oxide for a lithium secondary battery having an alkali content of less than 0.03% by weight is produced. |