| 摘要 |
A lithium transition metal oxide powder for use in a rechargeable battery is disclosed, where the surface of the primary particles of said powder is coated with a LiF layer, where this layer consists of a reaction product of a fluorine-containing polymer and the primary particle surface. The lithium of the LiF originates from the primary particles surface. Examples of the fluorine-containing polymer are either one of PVDF, PVDF-HFP or PTFE. Examples of the lithium transition metal oxide are either one of —LiCodMeO2, wherein M is either one of both of Mg and Ti, with e<0.02 and d+e=1; —Li1+aM′1−aO2±bM1kSm with −0.03<a<0.06, b<0.02, 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; M1 consisting of either one or more elements of the group Ca, Sr, Y, La, Ce and Zr, with 0≦̸k≦̸0.1 in wt %; and 0<m<0.6, m being expressed in mol %; and —LiaNixCOyM″zO2±eAf, with 0.9<a′<1.1, 0.5≦̸x≦̸0.9, 0<y≦̸0.4, 0<z≦̸0.35, e<0.02, 0≦̸f≦̸0.05 and 0.9<(x+y+z+f)<1.1; M″ consisting of either one or more elements from the group Al, Mg, and Ti; A consisting of either one or both of S and C. |
