| abstract |
The primary particles represented by the chemical formula 1 include agglomerated secondary particles, and the average particle size (D50) of the secondary particles is 7 μm or less, and the major axis with respect to the length (w) of the minor axis of the secondary particles. Provided is a positive electrode active material for a lithium secondary battery, wherein the average value of sphericality (particle), which is a ratio (l / w) of the length (l) of the particles, is 1.0 to 1.25. |