| abstract |
The invention provides lithium secondary battery cathode active material particle, which is formed as a secondary particle that is a mass of a plurality of single-crystal primary particles of a lithium-nickel-based complex oxide having a layered rock salt structure, wherein the primary particles have a mean particle size of 0.01 to 5 μm, and the secondary particle has an aspect ratio, which is a ratio of long axis diameter to short axis diameter, of 1.0 or more and less than 2 and a mean particle size of 1 to 100 μm, wherein the ( 003 ) planes of the second particle are substantially uniaxially oriented. |