| abstract |
The present invention relates to a bimodal lithium transition metal oxide-based powder for a rechargeable battery comprising a first lithium transition metal oxide-based powder and a second lithium transition metal oxide-based powder, - the first lithium transition metal oxide-based powder, A material A having a layered crystal structure composed of element Li, metal M and oxygen, wherein the Li content is stoichiometrically adjusted, and the metal M has the formula M = Co 1-a M ' a wherein 0? A ? And M 'is one or more metals of the group consisting of Al, Ga and B, or As a material B having a core and a surface layer, the core has a layered crystal structure composed of element Li, metal M and oxygen, the Li content is stoichiometrically controlled, and the metal M has the formula M = Co 1-a M ' a And M 'is one or more metals selected from the group consisting of Al, Ga and B, and the surface layer is composed of a mixture of an element of the core material and an inorganic N-based oxide, N is at least one element selected from the group consisting of Mg, Ti, Fe, Cu, Ca, Ba, Y, Sn, Sb, Na, Zn, Zr, Si, Nb, Mo, Ru, Rh, Pd, Ag, Cd, Sc, Ce, Pr, Nd, Gd, ≪ RTI ID = 0.0 > Er, < / RTI > The first powder has an average particle size (D50) of 15 [mu] m or more; - the second lithium transition metal oxide-based powder has the formula Li 1 + b N ' 1 -b O 2 , wherein -0.03 b 0..25 and N' = Ni x Mn y Co z A d , wherein 0.10 Lt; = 0.60, 0.30? Y? 0.80, 0.05? Z? 0.20 and 0? D? 0.10, A is a dopant, And the second powder has an average particle size (D50) of less than 5 [mu] m, preferably less than 2 [mu] m, for bimodal lithium transition metal oxide based powders for rechargeable batteries. |