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

The present embodiments relate to a cathode active material, a preparation method therefor, and a lithium secondary battery comprising same. An embodiment can provide a cathode active material comprising a lithium metal oxide particle and a coating layer disposed on the surface of the lithium metal oxide particle and having a c value of 1.25 or higher as analyzed for W4f by XPS, the c value being represented by formula 1 below: [Formula 1] c=b/a. In formula 1, a is a strength value of W4f 5/2 as measured by XPS and b is a strength value of specific W4f 7/2 as measured by XPS.

Cathode active material, preparation method therefor and lithium secondary battery comprising same

The present invention comprises, in lithium composite oxide particles, an overlithiated oxide having a layered crystal structure and represented by chemical formula 1 below, and comprises a lithium manganese oxide represented by chemical formula 2 below outside the lithium composite oxide particles, wherein the overlithiated oxide included in the particles and the lithium manganese oxide included outside the particles have different Li/M values. [Chemical formula 1] rLi 2MnO 3·(1-r)Li aNi xCo yMn zM1 1 -(x+y+z)O 2 (wherein, in chemical formula 1, 0<r≤0.6, 0<a≤1, 0≤x≤1, 0≤y<1, 0≤z<1, and 0<x+y+z≤1, and M1 is at least any one selected from Na, K, Mg, Al, Fe, Cr, Y, Sn, Ti, B, P, Zr, Ru, Nb, W, Ba, Sr, La, Ga, Mg, Gd, Sm, Ca, Ce, Fe, Al, Ta, Mo, Sc, V, Zn, Nb, Cu, In, S, B, and Bi) [Chemical formula 2] Li bMn PO Q (wherein, in chemical formula 2, 0.1≤b/p ≤2.5 and 0< q ≤15).

Positive electrode active material for lithium secondary battery, preparation method therefor, and lithium secondary battery comprising same

To provide a positive electrode active materials for a secondary battery and a manufacturing method thereof, and more specifically, a positive electrode active materials for a secondary battery and a manufacturing method thereof in which manganese oxide is present in the periphery of a primary particle in a lithium composite oxide including secondary particles in which primary particles are aggregated, and the concentration of Mn oxide in the primary particle represents a concentration gradient from the particle center to the particle surface, and the concentration of Mn oxide in the secondary particle represents a concentration gradient from the particle center to the particle surface, and a lithium ion migration path is formed in the primary particle.SOLUTION: A secondary battery containing a positive electrode active material for a secondary battery according to the present invention exhibits the feature of high safety while exhibiting high capacity and high output.SELECTED DRAWING: Figure 1

Positive electrode active material for secondary battery and manufacturing method thereof

The present invention relates to a lithium composite oxide precursor, a method for manufacturing the same, and a lithium composite oxide manufactured thereby. More particularly, the present invention relates to a lithium composite oxide precursor, which can improve the particle strength when manufacturing lithium composite oxide particles using the precursor by controlling the shape of the initial particles of the lithium composite oxide precursor and which can greatly improve the characteristics of a battery to which the precursor is applied, and to a method for manufacturing the same and a lithium composite oxide manufactured using the same.

Lithium composite oxide precursor process for producing the same and lithium complex oxide prepared using the same

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

The present invention relates to a lithium composite oxide and a method for manufacturing the same. More particularly, the present invention relates to a lithium composite oxide and a method for manufacturing the same in which a uniform coating layer is formed on a surface during the manufacturing of lithium composite oxide particles by using a lithium composite oxide precursor with controlled particle shape, thereby securing excellent particle strength and greatly enhancing the characteristics of a battery to which the lithium composite oxide is applied.

Lithium composite oxide and manufacturing method of the same

The present invention relates to a cathode active material for a secondary battery and a preparation method thereof, and more particularly, to a lithium composite oxide including a secondary particle formed as primary particles cohere, in which a manganese (Mn) oxide is present in the periphery of the primary particles, a concentration of an Mn oxide in the primary particle has a concentration gradient from the center of the primary particle to a surface of the particle, a concentration of an Mn oxide in the secondary particle has a concentration gradient from a surface of the secondary particle to the center thereof, and a lithium ion migration path is formed in the primary particle, and a preparation method thereof. A secondary battery including the cathode active material for a secondary battery may have high safety, while exhibiting high capacity and high output.

Cathode active material and manufacturing method thereof

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