| abstract |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery having excellent discharge load characteristics and cycle characteristics, a high coating density and a high capacity, and a Li-Co-based composite oxide used therefor, Provide a positive electrode plate. SOLUTION: It mainly comprises a small particle size group having a particle size of 1 μm to 6 μm and a large particle size group having a particle size of 15 μm to 22 μm, and the weight ratio of the small particle size group to the large particle size group is 0.25 to 0.25 μm. A Li-Co-based composite oxide of 0.60, and a positive electrode plate and a lithium ion secondary battery using the same. |