| 摘要 |
There can be provided a positive electrode active material for a secondary battry which is excellent in the charging and discharging cycle characteristics so that it retains high battery capacity that is comparable to the hitherto known LiNiO 2 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 )
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ Li y Ni 1-x Co x1 Mx 2 O 2 €ƒ€ƒ€ƒ€ƒ€ƒ( 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, x 1 represents 0 < x 1 < 0.5, x 1 + x 2 = x, when M is at least one element of A1, Fe and Mn, x 2 represents 0 < x 2 ‰¦ 0.3, when M is B, x 2 is 0 < x 2 ‰¦ 0.1, when M is the combination of B and at least one element of Al, Fe and Mn, x 2 represents 0 < x 2 < 0.3 but the ratio occupied by B therein is in a range of from 0 to 0.1). |
