| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a positive active material for a lithium secondary battery, including a lithium-cobalt compound oxide and having large volume capacity density, high safety, and excellent charging/discharging cycle durability, and to provide its manufacturing method. <P>SOLUTION: This positive electrode active material includes the lithium-cobalt compound oxide expressed by a general expression, Li<SB>p</SB>Co<SB>x</SB>M<SB>y</SB>O<SB>z</SB>F<SB>a</SB>(where, M is a transition metal element other than Co, or an alkaline earth metal element. 0.9≤p≤1.1, 0.980≤x≤1.000, 0≤y≤0.02, 1.9≤z≤2.1, x+y=1, and 0≤a≤0.02), comprising substantially spherical large-sized particles of the compound oxide having average grain size D50 of 7 to 20μm and small-sized particles of the compound oxide having average grain size D50 of 10 to 30% of the D50 of the large-sized particles of the compound oxide, and made up of a mixture of the former/latter having a mass ratio of 1/2 to 9/1. <P>COPYRIGHT: (C)2004,JPO |
