| 摘要 |
There can be provided a positive electrode active material for a secondary battery which is excellent in the charging and discharging cycle characteristics so that it retains high battery capacity that is comparable to the hitherto known LiNiO2 even by increasing the number of cycle, which has an improved cycle property (stability) at high temperature and which is a complex oxide represented by the general formula (I)(wherein M represents at least one element selected from the group consisting of Al, Fe, Mn and B, y represents 0.9<=y<=1.3, x represents 0<x<=0.5, x1 represents 0<x1<0.5, x1+x2 x, when M is at least one element of Al, Fe and Mn, x2 represents 0<x2<=0.3, when M is B, x2 is 0<x2<=0.1, when M is the combination of B and at least one element of Al, Fe and Mn, x2 represents 0<x2<0.3 but the ratio occupied by B therein is in a range of from 0 to 0.1). |
