| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a positive active material for a nonaqueous lithium secondary battery providing high output, and also to provide the positive active material and the lithium secondary battery using it. <P>SOLUTION: In the nonaqueous system lithium secondary battery with a complex oxide composed of lithium and transition metal as the cathode active material, the cathode active material is expressed in a composition formula: Li<SB>a</SB>Mn<SB>x</SB>Ni<SB>y</SB>M<SB>z</SB>O<SB>2</SB>[M=at least either of Co, Al] and is a compound having a lamellar crystal structure of:x+y+z=1 within a range of 1≤a≤1.2, 0.2≤x≤0.5, 0.35≤y≤0.5, 0≤z≤0.45. When the cathode active material is dispersed with pure water (pH 7.2-7.5) in an amount of 5 weight times, the pH of its supernatant liquid is 10.0-12.0. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
