A lithium nickel cobalt complex oxide, a process for...

Details A lithium nickel cobalt complex oxide, a process for... A lithium nickel cobalt complex oxide, a process for...

C - Chemistry, Metallurgy

01

G

C01G 53/04 (2006.01) C01G 51/04 (2006.01) C01G 53/00 (2006.01) H01M 4/26 (2006.01) H01M 4/32 (2006.01) H01M 4/48 (2006.01)

Patent

CA 2263320

A composite oxide represented by the general formula (I): Li yNi l-x Co x1, M x2 O2 , wherein M represents at least one member selected from the group consisting of Al,Fe,Mn,and B;0.9<=y<=1.3;0<x<=0.5;0<x1 <0.5; x1 + x2 = x; when M represents at least one member selected from among Al, Fe, and Mn, then 0 < x2<=0.3; when M represents B, then 0<x2 < 0.1; when M represents B and at least one member selected from among Al, Fe, and Mn, then 0<x2<0.3; provided that the proportion of B is in the range of from 0 to 0.1. This composite oxide can provide a cathode active material for rechargeable batteries which possesses excellent discharge-charge cycle properties, can maintain a high battery capacity comparable to the conventional LiNiO2 even after an increased number of cycles, and has an improved cycle property (stability) at high temperatures.

Cette invention se rapporte à un oxyde composite représenté par la formule générale (I): LiyNi1-xCox1Mx2O2, où M représente au moins un élément choisi dans le groupe constitué par Al, Fe, Mn et B; 0,9 </= y </= 1,3; 0 < x </= 0,5; 0 < x1 < 0,5; x1 + x2 = x; lorsque M représente au moins un élément choisi parmi Al, Fe, et Mn, alors 0 < x2 </= 0.3; lorsque M représente B, alors 0 < x2 </= 0,1; lorsque M représente B et au moins un élément choisi parmi Al, Fe, et Mn, alors 0 < x2 < 0,3; à condition que la proportion de B soit comprise entre 0 et 0,1. Cet oxyde composite peut former un matériau actif de cathode pour batteries rechargeables, qui possède d'excellentes propriétés de cycles de décharge-charge, il peut conserver une capacité de batterie élevée qui est comparable à LiNiO2 traditionnel, même après un nombre accru de cycles, et il possède une propriété (stabilité) de cycle améliorée à haute température.

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