| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium nickel cobalt manganese composite oxide with high characteristics and useful as a positive active material for a lithium ion secondary battery, its manufacturing method, and the lithium ion secondary battery using this composite oxide. SOLUTION: The lithium nickel cobalt manganese composite oxide is represented by the composition formula of Li[Ni1/3 Co1/3 Mn1/3 ]O2 in which the actual atomic ratio of nickel, cobalt, and manganese is 1:1:1, has high crystalline layered structure of a rhombohedral system, and the length of a C axis belonging as a hexagonal system is 14.15 Å or more. |
