5. The method of claim 3, wherein, in preparing of the metal precursor, a metal salt solution is added to the reactor to allow a reaction to occur until a metal precursor having a particle size in a range of 3 micrometers (μm) to 15 μm and a tap density in a range of 1.8 grams per cubic centimeter (g/cc) to 2.0 g/cc is obtained.
precursor
particle size
in a range of 3 micrometers (μm) to 15 μm
μm
precursor
tap density
in a range of 1.8 grams per cubic centimeter (g/cc) to 2.0 g/cc
g/cc