Electrochemically active material for a positive electrode of a secondary lithium battery

摘要

Electrochemically active material (I) comprises more than 97 wt.% of a rhombohedral crystal phase comprising a mixed oxyfluoride (II) of lithium, nickel and manganese. - Electrochemically active material comprises more than 97 wt.% of a rhombohedral crystal phase comprising a mixed oxyfluoride of formula Li(Ni(1-x-y-z-t)CoxMnyLizMt)O2-eFe (II) - x = greater than or equal to 0 and less than 0.7; - y = greater than 0.05 and less than or equal to 0.5; - z = greater than or equal to 0 and less than or equal to 0.2; - t = greater than 0 and less than or equal to 0.3; - e = greater than 0.01 and less than or equal to 0.5; - (1-x-y-z-t) = less than or equal to 0.20. - M = Mg, Al, Bi, Ti, Si, Zr, Fe, Zn and/or Cu. - Independent claims are also included for: - (1) positive electrode for a rechargeable lithium battery, comprising a conductive support covered with an active layer containing (I); - (2) rechargeable lithium battery comprising a positive electrode containing (I) and a negative electrode whose active material is metallic lithium, a lithium alloy or a material into whose structure lithium can be inserted.