The invention relates to the field of lithium ion battery positive electrode ternary materials, in particular to a method for preparing a nickel cobalt lithium manganate single crystal ternary material. The method comprises the following steps: (1) mixing a precursor with lithium hydroxide monohydrate according to a molar ratio of Li: (Ni0.65Co015Mn0. 2) = (1+x): 1, wherein x is greater than or equal to 0.04 and less than or equal to 0.08, and adding a zirconium compound and a fluxing agent to obtain a mixture; (2) sequentially carrying out dry mixing and calcining on the obtained mixture to obtain a single crystal material block; and (3) sequentially carrying out coarse crushing, jet milling and sieving on the obtained material block. According to the preparation method, particles with relatively low Li/Ni mixed arrangement degree and outstanding single crystal morphology are easily generated; the preparation process is simple, the reproducibility is good, the morphology is easy to control, and large-scale industrial production and application are easy; meanwhile, the obtained nickel cobalt lithium manganate single crystal ternary material is high in crystallinity, stable in material performance and excellent in cycle performance.

Method for preparing nickel cobalt lithium manganate single crystal ternary material

To provide a positive electrode active material for a lithium secondary battery, capable of maintaining an excellent reversible capacity of LiNiO, and furthermore enabling low high-temperature stability to be remedied, and to provide a lithium secondary battery including the positive electrode active material for a lithium secondary battery.SOLUTION: The positive electrode active material for a lithium secondary battery is provided that comprises a plurality of secondary particles including a primary particle, which is a lithium-based composite oxide, having a single-crystal structure, wherein the proportion of secondary particles having a grain boundary density of 0.5 or less among the plurality of secondary particles constituting the positive electrode active material may be 30% or more. The grain boundary density denotes a value obtained by dividing the number of boundaries between primary particles in secondary particle by the number of primary particles constituting secondary particle.SELECTED DRAWING: Figure 2

Positive electrode active material for lithium secondary battery and lithium secondary battery including the same

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Positive electrode active material for lithium secondary battery and lithium secondary battery including the same