Doped lithium transition metal oxides containing sulfur

C - Chemistry – Metallurgy – 01 – G

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C01G 45/00 (2006.01) H01M 4/131 (2010.01) H01M 4/485 (2010.01) C01G 23/00 (2006.01) C01G 51/00 (2006.01) C01G 53/00 (2006.01)

Patent

CA 2694000

The invention covers a powderous lithium transition metal oxide having a layered crystal structure Li1+a M1-a O2~b M'k Sm with -0.03 < a < 0.06, b .congruent. 0, M being a transition metal compound, consisting of at least 95% of either one or more elements of the group Ni, Mn, Co and Ti; M' being present on the surface of the powderous oxide, and consisting of either one or more elements from (IUPAC) of the Periodic Table, each of said Group 2, 3, or 4 elements having an ionic radius between 0.7 and 1.2 Angstrom, M' however not comprising Ti, with 0.015 < k < 0.15, k being expressed in wt%, and 0.15 < m <=0.6, m being expressed in mol%. The addition M' (like Y, Sr, Ca, Zr,...) improves the performance as cathode in rechargeable lithium batteries. In a preferred embodiment a content of 250-400 ppm calcium and 0.2-0.6 mol% of sulfur is used. Particularly, a significantly lower content of soluble base and a dramatically reduced content of fine particles are achieved. Especially preferred performance is achieved if 11.5-13.5% of the metal atoms of the cathodes are divalent nickel.

L'invention porte sur un oxyde de métal de transition lithié pulvérulent ayant une structure cristalline feuilletée Li1+aM1-aO2±b M'k Sm, -0,03 < a < 0,06, b ? 0, M étant un composé de métal de transition, consistant en au moins 95 % d'un ou de plusieurs éléments du groupe comprenant Ni, Mn, Co et Ti; M' étant présent à la surface de l'oxyde pulvérulent, et consistant en un ou plusieurs éléments pris dans la classification périodique (UICPA), chacun desdits éléments des groupes 2, 3 ou 4 ayant un rayon ionique compris entre 0,7 et 1,2 angström, M' ne comprenant cependant pas Ti, et 0,015 < k < 0,15, k% étant exprimé en poids, et 0,15 < m = 0,6, m% étant exprimé en moles. Le M' d'addition (comme Y, Sr, Ca, Zr,...) améliore le rendement pour une utilisation en tant que cathode dans des batteries au lithium rechargeables. Dans un mode de réalisation préféré, une teneur de 250 à 400 ppm de calcium et de 0,2 à 0,6 % en moles de soufre est utilisée. En particulier, une teneur sensiblement inférieure de base soluble et une teneur considérablement réduite de fines particules sont obtenues. Un rendement particulièrement préféré est obtenu si 11,5 à 13,5 % des atomes de métal des cathodes sont du nickel divalent.

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