Precursors and methods for the preparation of Li transition metal oxide cathodes for rechargeable batteries

摘要

Lithium-ion batteries available lithium-transition is used as the positive electrode active material is a crystalline precursor compounds disclosed for the preparation of metal-oxide powder, wherein the precursor is represented by the general formula _{Li 1-a ((Ni z} (Ni ½ Mn ½) y M 'x) _1-k A _{k1 + a} O ₂ where x + y + z = 1, 0 x? 0.2, 0.55 z? 0.90, M 'is either or both Co and Al , Wherein A is a dopant, 0? K? 0.1 and 0.05? A? 0.40, and the precursor has an integral intensity ratio I003 / I104 of less than 1, wherein I003 and I104 are Bragg's XRD patterns of crystalline precursor compounds Peak / RTI (003) and (104)). Also, C0 ₂ -. By sintering the crystalline precursor compound for 6-36 hours of time (t) at a temperature (T) of 750~950 ℃ not included in the oxidizing atmosphere, the general formula _{Li 1-a M 1-a} '0 _{2[where, M = (Ni z (Ni} 1/2 Mn 1/2) y M 'x) , and _{1-k a k, x +} y + and z = 1, 0 x≤0.2, and, 0.55 z Lt; = 0.90, M 'is either or both Co and Al, and A is a dopant, 0? K? 0.1 and 0.01? A'? 0.10.