| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electrode capable of structuring a nonaqueous electrolyte secondary battery which can improve preservation characteristics and cycle characteristics, and yet secure excellent stability while attaining higher capacity by high-voltage charging, as well as a nonaqueous electrolyte secondary battery equipped with the electrode. <P>SOLUTION: The electrode is provided with a cathode mixture layer containing an active material expressed in a composition formula: Li<SB>(1+δ)</SB>Mn<SB>x</SB>Ni<SB>y</SB>Co<SB>(1-x-y)</SB>O<SB>2</SB>(-0.15<δ<0.15, 0.1<x≤0.5, 0.5<x+y≤1.0), with an average particle size of 5 to 25 μm, and a specific surface area of 0.1 to 0.6 m<SP>2</SP>/g, and when an amount of Co to the sum of Mn, Ni, and Co on the surface of the cathode mixture layer is set at 'a' in an atom ratio, a value of 'a' is 1.5 times or more of an average value [(1-x-y)/1] at an atom ratio of the Co amount to the sum of Mn, Ni, and Co on the surface of the cathode mixture layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
