Non-homogeneous positive electrode materials combining high...

H - Electricity – 01 – M

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H01M 4/52 (2010.01) H01M 4/13 (2010.01) H01M 4/1391 (2010.01) H01M 4/13915 (2010.01) H01M 4/525 (2010.01) H01M 10/05 (2010.01)

Patent

CA 2751819

The invention relates to a Li a Ni x Co y M z O2 e A f composite oxide for use as a cathode material in a rechargeable battery, with a non-homogenous Ni/Al ratio in the particles, allowing excellent power and safety properties when used as positive electrode material in Li battery. More particularly, in the formula 0.9 < a < 1.1, 0.3<=x<=0.9, 0<=y<=0.4, 0 < z <=0.35, e=0, 0<=f<=0.05 and 0.9 < (x+y+z+f) < 1.1; M consists of either one or more elements from the group Al, Mg and Ti; A consists of either one or more elements from the group S and C. The powder has a particle size distribution defining a D10, D50 and D90; and said x and z parameters varying with the particles size of said powder, and is characterized in that either one or both of:x1-x2>=0.010and z2 - z1>=0.010;x1 and z1 being the parameters corresponding to particles having a particle size D90; and x2 and z2 being the parameters corresponding to particles having a particle size D10.

L'invention porte sur un oxyde composite LiaNixCoyMz O2±e Af destiné à être utilisé en tant que matériau de cathode dans une batterie rechargeable, ayant un rapport Ni/Al non homogène dans les particules, offrant d'excellentes propriétés de puissance et de sécurité lorsqu'il est utilisé comme matériau d'électrode positive dans une batterie au lithium. Plus spécifiquement, dans la formule 0,9 < a < 1,1, 0,3 = x = 0,9, 0 < y = 0,4, 0 < z = 0,35, e = 0, 0 = f = 0,05 et 0,9 < (x + y + z + f) < 1,1 ; M est constitué d'un ou plusieurs éléments du groupe comprenant Al, Mg et Ti ; A est constitué d'un ou plusieurs éléments du groupe comprenant S et C. La poudre a une distribution de taille de particules définissant une valeur D10, D50 et D90 ; et lesdits paramètres x et z varient avec la taille de particules de ladite poudre, et sont caractérisés en ce que x1 - x2 = 0,010 et/ou z2 - z1 = 0,010 ; x1 et z1 étant les paramètres correspondant à des particules ayant une taille de particule D90 ; et x2 et z2 étant les paramètres correspondant à des particules ayant une taille de particules D10.

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