5. The precursor of a positive electrode active material for a secondary battery of Claim 1, which has an average particle diameter (D50) of 7 .micro.m to 20 .micro.m and a BET specific surface area of 5.0 m2/g to 30.0 m2/g.
The precursor
average particle diameter (D50
7 .micro.m to 20 .micro.m
micro.m
The precursor
BET specific surface area
5.0 m2/g to 30.0 m2/g
m2/g