| abstract |
[57] [Summary] [Problem] To be used in a wide range of voltage, for large non-aqueous electrolyte secondary battery with high electric capacity and excellent low-temperature operability, excellent charge / discharge cycle durability A composite oxide is obtained. 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 10 μm and a specific surface area of 0.1. 1 to 10 m 2 / g cobalt trioxide powder, a weight average particle size of 1 to 50 μm and a specific surface area of 0.1 to 10 m 2 / g of lithium carbonate powder, and the weight ratio of cobalt oxyhydroxide powder to cobalt tetroxide powder cobalt is 1 / 4 to 4/1 mixed and fired in an oxygen-containing atmosphere, characterized by having a weight average particle diameter of 5 to 15 μm and a specific surface area of 0.15 to 0.60 m 2 / g. To manufacture a hexagonal lithium cobalt composite oxide for a lithium secondary battery. |