4. The composite transition metal oxide-based precursor of claim 3, wherein the primary particle has a flake-like or needle-like shape with an average particle diameter in a range of 0.01 to 0.8 μm, and a plurality of pore structures is present on the surface or inside thereof, and the secondary particle has an average particle diameter (D50) in a range of 3 to 30 μm.
primary particle
average particle diameter
a range of 0.01 to 0.8 μm
μm
the secondary particle
average particle diameter (D50
in a range of 3 to 30 μm
μm