| 摘要 |
<P>PROBLEM TO BE SOLVED: To elongate a cycle life of a cell through degradation prevention by restraining resistance increment inside a lithium secondary cell at high temperature charging. <P>SOLUTION: A cathode active material of a lithium secondary cell is expressed by LiNi<SB>1-x-y</SB>Co<SB>x</SB>Al<SB>y</SB>O<SB>2</SB>or LiNi<SB>(1-x-y)</SB>Co<SB>x</SB>Mn<SB>y</SB>O<SB>2</SB>(0.1≤x≤0.2, 0.03<y<0.1), and a ratio of a peak value in which 2θ value is observed in the vicinity of 45 degrees to a peak value of a diffraction line in which the 2θ value is observed in the vicinity of 18 degrees at a scanning position, by an X-ray diffraction analysis, is in a range from 46 to 51%, as well as a lithium secondary cell using this and its manufacturing method are provided. <P>COPYRIGHT: (C)2009,JPO&INPIT |
