| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery of high capacity, high safety, and with excellent cycle characteristics as well as preservation characteristics even under high voltage. <P>SOLUTION: A cathode 6 of the nonaqueous electrolyte secondary battery 1 contains cathode active material particles, which has a composition expressed in a formula: Li<SB>(1+δ)</SB>Mn<SB>x</SB>Ni<SB>Y</SB>Co<SB>(1-x-y-z)</SB>M<SB>z</SB>O<SB>2</SB>, where, M denotes at least one kind of element selected from a group consisting of Ti, Zr, Nb, Mo, W, Al, Si, Ga, Ge, and Sn, while, δ, x, y, and z satisfy relations of: -0.15<δ<0.15, 0.1<x≤0.5, 0.6<x+y+z≤1.0, 0.9<x/y<1.1, and 0<z≤0.1, and an atomic ratio 'a' of M to Mn, Ni, and Co on the surface of the cathode active material particles is larger than an average atomic ratio [z/(1-z)] of the M to Mn, Ni, and Co in the cathode active material particles as a whole. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
