| 摘要 |
A positive electrode active material for lithium secondary batteries, which contains secondary particles wherein primary particles that are able to be doped or undoped with lithium ions aggregate. This positive electrode active material for lithium secondary batteries has a ratio of the crystallite size α at a peak within the range of 2θ = 18.7 ± 1° to the crystallite size β at a peak within the range of 2θ = 44.4 ± 1°, namely α/β of from 1.60 to 2.40 (inclusive) in powder X-ray diffractometry using a Cu-Kα ray, and has an α-NaFeO2 type crystal structure represented by composition formula (I). Li[Lix(NiaCobMncMd)1-x]O2 (I) (In the formula, 0 ≤ x ≤ 0.1, 0.7 < a < 1, 0 < b < 0.2, 0 ≤ c < 0.2, 0 < d < 0.1, a + b + c + d = 1, and M represents Fe or the like.) |
