1. A nickel-based active material precursor for a lithium secondary battery, comprising:
a porous core; and
a shell having a radially arranged structure with a higher density than the porous core,
wherein the nickel-based active material precursor has a size of about 9 µm to about 14 µm, and
the porous core has a volume of about 5 % by volume to about 20 % by volume based on the total volume of the nickel-based active material precursor.
active material precursor
size
9 µm to about 14 µm
µm