Method of producing positive electrode material for secondary battery

Patent metadata

Field	Value
Publication number	US-12021228-B2
Application number	US-202017780128-A
Country	US
Kind code	B2
Filing date	Dec 4, 2020
Priority date	Dec 6, 2019
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

A method of producing a positive electrode material for a secondary battery includes preparing a lithium composite transition metal oxide containing nickel, cobalt, and manganese, forming a coating layer on a surface of the lithium composite transition metal oxide, and post-treating the lithium composite transition metal oxide having the coating layer formed thereon, wherein the post-treating is performed by exposing the lithium composite transition metal oxide having the coating layer formed thereon to moisture at a relative humidity of 10% to 50% at 25° C., and then heat treating the lithium composite transition metal oxide to remove residual moisture.

First claim

The invention claimed is:

1. A method of producing a positive electrode material for a secondary battery, the method comprising:
preparing a lithium composite transition metal oxide containing nickel, cobalt, and manganese;
forming a coating layer on a surface of the lithium composite transition metal oxide; and
subsequently post-treating the lithium composite transition metal oxide having the coating layer formed thereon,
wherein, the post-treating is performed by exposing the lithium composite transition metal oxide having the coating layer formed thereon to moisture at a relative humidity of 10% to 50% at 25° C., and then heat treating at 100° C. to 500° C. to remove residual moisture,
wherein the lithium composite transition metal oxide is a secondary particle in which primary particles are aggregated, and
wherein the coating layer is distributed to surfaces of the primary particles inside the secondary particle through the post-treating.

2. The method of claim 1 , wherein the coating layer contains a lithium metal oxide including at least one element selected from the group consisting of Al, B, W, Mg, V, Ti, Zn, Ga, In, Ru, Nb, Sn, Sr, and Zr.

3. The method of claim 2 , wherein the lithium metal oxide is a water soluble compound.

4. The method of claim 3 , wherein the coating layer contains a lithium metal oxide including at least one selected from the group consisting of Al, B, and W.

5. The method of claim 1 , wherein the post-treating is performed by exposing the lithium composite transition metal oxide having the coating layer formed thereon to moisture at a relative humidity of 10% to 30% at 25° C.

6. The method of claim 1 , wherein the post-treating is performed by exposing the lithium composite transition metal oxide having the coating layer formed thereon to moisture for 1 to 240 hours.

7. The method of claim 1 , wherein the heat treating to remove the residual moisture is performed for 1 to 10 hours.

8. The method of claim 1 , wherein the lithium composite transition metal oxide is represented Formula 1 below:
Li a Ni 1-b-c-d Co b Mn c Q d O 2+δ   [Formula 1]

wherein in Formula 1 above, Q is at least one element selected from the group consisting of Al, B, W, Mg, V, Ti, Zn, Ga, In, Ru, Nb, Sn, Sr, and Zr, and 1.0≤a≤1.5, 0<b<0.5, 0<c<0.5, 0≤d≤0.1, 0<b+c+d≤0.5, and −0.1≤δ≤1.0.

9. The method of claim 1 , wherein the lithium composite transition metal oxide is a secondary particle in which primary particles are aggregated; and wherein both the secondary particle and the primary particles have coating layers after the post-treating.

Assignees

• Lg Energy Solution Ltd

Inventors

• Han Gi Beom
• Jung Wang Mo
• Lee Sang Wook
• Kim Hak Yoon
• Baek So Ra
• Han Jung Min

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/525

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

• H01M4/505

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

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• C01P2006/40

  Electric properties · CPC title