Positive Electrode Active Material for Lithium Secondary Battery, Method of Preparing the Same, and Positive Electrode for Lithium Secondary Battery and Lithium Secondary Battery Which Include the Positive Electrode Active Material

Patent metadata

Field	Value
Publication number	US-2024194852-A1
Application number	US-202418411502-A
Country	US
Kind code	A1
Filing date	Jan 12, 2024
Priority date	Apr 6, 2018
Publication date	Jun 13, 2024
Grant date	—

Abstract

A positive electrode active material includes a lithium transition metal oxide and a coating element M 3 -containing coating layer formed on a surface of the lithium transition metal oxide, wherein M 3 comprises at least one of Al, Ti, Mg, Zr, W, Y, Sr, or Co, wherein the lithium transition metal oxide is doped with a doping element M 2 , wherein M 2 includes at least one of Al, Ti, Mg, Zr, W, Y, Sr, Co, F, Si, Na, Cu, Fe, Ca, S, or B, wherein the lithium transition metal oxide has a single particle form, and includes a center portion having a layered structure and a surface portion having a rock-salt structure, and the total amount of the doping element M 2 and the coating element M 3 is in a range of 4,580 ppm to 9,120 ppm based on a total weight of the positive electrode active material.

First claim

1 . A positive electrode active material comprising:
a lithium transition metal oxide represented by Formula 1; and a coating element M 3 -containing coating layer formed on a surface of the lithium transition metal oxide represented by Formula 1, wherein M 3 comprises at least one of Al, Ti, Mg, Zr, W, Y, Sr, or Co;
Li 1+a [Ni x Co y M 1 z M 2 w ] 1-a O 2   [Formula 1]

wherein, 0≤a≤0.2, 0.6≤x<1, 0<y≤0.4, 0<z≤0.4, 0<w≤0.1, and x+y+z+w=1, M 1 comprises at least one of manganese (Mn) or Al, and M 2 comprises at least one of Al, Ti, Mg, Zr, W, Y, Sr, Co, F, Si, Na, Cu, Fe, Ca, S, or B, wherein the lithium transition metal oxide has a single particle form and comprises a center portion having a layered structure and a surface portion having a rock-salt structure, and a total amount of a doping element M 2 and the coating element M 3 is in a range of 4,580 ppm to 9,120 ppm based on a total weight of the positive electrode active material.

2 . The positive electrode active material of claim 1 , wherein a grain size of the positive electrode active material is in a range of 180 nm to 300 nm.

3 . The positive electrode active material of claim 1 , wherein the doping element M 2 comprises Sr.

4 . The positive electrode active material of claim 1 , wherein the doping element M 2 comprises Zr.

5 . The positive electrode active material of claim 1 , wherein the doping element M 2 comprises Y.

6 . The positive electrode active material of claim 1 , wherein the doping element M 2 comprises Ti.

7 . The positive electrode active material of claim 1 , wherein the coating element M 3 comprises Al.

8 . The positive electrode active material of claim 1 , wherein the coating element M 3 comprises W.

9 . The positive electrode active material of claim 1 , wherein the doping element M 2 is included in an amount of 3,580 ppm to 7,620 ppm based on the total weight of the positive electrode active material.

10 . The positive electrode active material of claim 1 , wherein the surface portion is a region located within 100 nm from a surface toward a center of a particle.

11 . The positive electrode active material of claim 1 , wherein a total amount of the doping element M 2 and the coating element M 3 is in a range of 5,000 ppm to 9,120 ppm based on the total weight of the positive electrode active material.

12 . The positive electrode active material of claim 1 , wherein the positive electrode active material has an average particle diameter of 3.5 μm to 7 μm.

13 . The positive electrode active material of claim 1 , wherein the coating element M 3 is different from the doping element M 2 .

14 . A positive electrode for a lithium secondary battery, the positive electrode comprising the positive electrode active material of claim 1 .

15 . A lithium secondary battery comprising the positive electrode of claim 14 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Yoo Tae Gu
• Park Yong Uk
• Hwang Jin Tae
• Jung Wang Mo
• Park Sung Bin

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/364

  as mixtures · CPC title