Method of preparing positive electrode active material

Patent metadata

Field	Value
Publication number	US-12412894-B2
Application number	US-202117800087-A
Country	US
Kind code	B2
Filing date	Apr 15, 2021
Priority date	Apr 17, 2020
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

The method of preparing a positive electrode capable of reducing the usage amount of a rinsing solution, and minimizing the surface degradation of a positive electrode active material is provided. A method of preparing a positive electrode active material includes: (A) preparing a lithium transition metal oxide; and (B) mixing the lithium transition metal oxide and a rinsing solution and performing rinsing and drying, wherein the rinsing solution includes one or more additive of LiOH, NaOH, or KOH, the additive is included in an amount of 3,000 ppm to 18,000 ppm relative to the lithium transition metal oxide in the rinsing solution, and the rinsing solution has a pH of 12 or more.

First claim

The invention claimed is:

1. A method of preparing a positive electrode active material, comprising:
(A) preparing a lithium transition metal oxide; and
(B) mixing the lithium transition metal oxide and a rinsing solution and performing rinsing and drying,
wherein the rinsing solution includes one or more additive of LiOH, NaOH, or KOH,
the additive is included in an amount of 3,000 ppm to 18,000 ppm relative to the lithium transition metal oxide in the rinsing solution, and
the rinsing solution has a pH of 12 or more.

2. The method of claim 1 , wherein the additive is included in an amount of 4,000 ppm to 10,000 ppm relative to the lithium transition metal oxide in the rinsing solution.

3. The method of claim 1 , wherein the rinsing solution has a pH of 12 to 13.

4. The method of claim 1 , wherein the lithium transition metal oxide is represented by the following Chemical Formula 1:
Li 1+a Ni x1 Co y1 M 1 z1 M 2 w1 O 2   [Chemical Formula 1]

wherein 0≤a≤0.3, 0.6≤x1<1.0, 0<y1≤0.4, 0<z1≤0.4, 0≤w1≤0.2, and x1+y1+z1+w1=1 are satisfied,
M 1 is one or more of Mn or Al, and
M 2 is one or more of Zr, B, W, Mo, Cr, Nb, Mg, Hf, Ta, La, Ti, Sr, Ba, Ce, F, P, S, or Y.

5. The method of claim 1 , wherein the lithium transition metal oxide and the rinsing solution are mixed in a weight ratio of 1:0.5 to 1:2.0.

6. The method of claim 1 , wherein the lithium transition metal oxide and the rinsing solution are mixed in a weight ratio of 1:0.5 to 1:1.3.

7. The method of claim 1 , wherein the additive is included in an amount of 0.4 wt % to 2 wt % in the rinsing solution.

8. The method of claim 1 , wherein the additive is included in an amount of 0.4 wt % to 1 wt % in the rinsing solution.

9. The method of claim 1 , wherein a solvent of the rinsing solution is one or more of deionized water, distilled water, or ethanol.

10. The method of claim 1 , further comprising (C) mixing the dried lithium transition metal oxide with a coating element-containing raw material and performing thermal treatment to form a coating layer.

Assignees

• Lg Chemical Ltd

Inventors

• Son Min Hee
• Lee Hyuck
• Mok Duck Gyun
• Kwak No Woo
• Ahn Dong Joon

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/366

  as layered products · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title