Positive electrode material of lithium-ion battery and preparation method therefor
摘要
說(shuō)明書
Then, the mixture after the mixing may be subjected to programmed calcining. The programmed calcining may be operated under an oxygen atmosphere. The oxygen atmosphere may be formed by introducing oxygen, where the flow rate Q of oxygen may be 1-2 m3/kg·h.
In one embodiment, the programmed calcining comprises: subjecting to a first calcining at 300-500° C. to obtain the first calcined product; and subjecting to a second calcining at the calcining temperature T to obtain the second calcined product. Preferably, the first calcining may be operated at a temperature of 300-500° C., preferably 350-450° C., for example, at a temperature of 300° C., 350° C., 400° C., 450° C. or 500° C., for 1-10 hours, preferably 4-8 hours, for example 1 h, 2 h, 3 h, 4 h, 5 h, 6 h, 7 h or 8 h.
Preferably, in the second calcining, the calcining temperature T may be: 670+(1?x)*500 to 780+(1?x)*500° C.; preferably, 690+(1?x)*500 to 770+(1?x)*500° C.; for example, 700+(1?x)*500° C., 710+(1?x)*500° C., 720+(1?x)*500° C., 730+(1?x)*500° C., 740+(1?x)*500° C., 750+(1?x)*500° C. or 760+(1?x)*500° C., wherein x is the Ni content in the nickel cobalt manganese active materials, and 0.3≤x≤0.99, as defined above.
In one embodiment, the flow rate Q of oxygen (in m3/kg·h) and the second calcining time t (in hour) may satisfy the relationship of ?13.17 ln(Q)+14.54≤t≤?13.17 ln(Q)+16.54. Preferably, ?13.17 ln(Q)+14.54≤t≤?13.17 ln(Q)+16.54. For example, t=?13.17 ln(Q)+15, t=?13.17 ln(Q)+15.5, t=?13.17 ln(Q)+16 or t=?13.17 ln(Q)+16.5.
