9. The positive electrode active material for a secondary battery of Claim 8, which has an average particle diameter of 7 .micro.m to 15 .micro.m and a BET specific surface area of 0.1 m2/g to 1.0 m2/g.
positive electrode active material
average particle diameter
7 .micro.m to 15 .micro.m
micro.m
positive electrode active material
BET specific surface area
0.1 m2/g to 1.0 m2/g
m2/g