Method of Preparing Positive Electrode Active Material and the Positive Electrode Active Material

Patent metadata

Field	Value
Publication number	US-2025343230-A1
Application number	US-202318867561-A
Country	US
Kind code	A1
Filing date	Jun 7, 2023
Priority date	Jun 7, 2022
Publication date	Nov 6, 2025
Grant date	—

Abstract

A method of preparing a positive electrode active material including preparing a composite transition metal hydroxide containing zirconium by a co-precipitation reaction while adding a transition metal-containing solution containing at least one of nickel, cobalt, or manganese, a zirconium-containing raw material, an ammonium cationic complexing agent, and a basic solution into a reactor and preparing a lithium composite transition metal oxide by mixing the composite transition metal hydroxide containing zirconium with a lithium-containing raw material and an aluminum-containing raw material to form a mixture and sintering the mixture. The lithium composite transition metal oxide includes zirconium, aluminum, and at least one of nickel, cobalt, or manganese. A positive electrode active material prepared by the preparation method is also provided.

First claim

1 . A method of preparing a positive electrode active material, comprising:
preparing a composite transition metal hydroxide containing zirconium by a co-precipitation reaction while adding a transition metal-containing solution comprising at least one of nickel, cobalt, or manganese, a zirconium-containing raw material, an ammonium cationic complexing agent, and a basic solution into a reactor; and preparing a lithium composite transition metal oxide by mixing the composite transition metal hydroxide containing zirconium with a lithium-containing raw material and an aluminum-containing raw material to form a mixture and sintering the mixture, wherein the lithium composite transition metal oxide comprises zirconium, aluminum, and at least one of nickel, cobalt, or manganese.

2 . The method of claim 1 , wherein the zirconium-containing raw material is at least one selected from zirconium hydroxide, zirconium sulfate, zirconium acetate, zirconium nitrate, zirconium halide, zirconium sulfide, and zirconium oxyhydroxide.

3 . The method of claim 1 , wherein the zirconium-containing raw material is added such that an amount of zirconium ranges from 1,000 ppm to 9,000 ppm based on a total weight of the composite transition metal hydroxide containing zirconium.

4 . The method of claim 1 , wherein the aluminum-containing raw material is at least one selected from aluminum hydroxide, aluminum oxide, aluminum sulfate, aluminum acetate, aluminum nitrate, aluminum halide, aluminum sulfide, and aluminum oxyhydroxide.

5 . The method of claim 1 , wherein the aluminum-containing raw material is added such that an amount of the aluminum is-ranges from 1,000 ppm to 9,000 ppm based on a total weight of the lithium composite transition metal oxide.

6 . The method of claim 1 , wherein the sintering of the mixture is performed at a temperature ranging from 700° C. to 800° C.

7 . A positive electrode active material, comprising:
a lithium composite transition metal oxide which comprises zirconium, aluminum, and at least one of nickel, cobalt, or manganese,
wherein a weight ratio of aluminum present inside the positive electrode active material to aluminum present on a surface of the positive electrode active material is greater than 1.0, and
a weight ratio of zirconium present inside the positive electrode active material to zirconium present on the surface of the positive electrode active material is greater than 1.0.

8 . The positive electrode active material of claim 7 , wherein the lithium composite transition metal oxide comprises zirconium in an amount ranging from 1,000 ppm to 9,000 ppm based on a total weight.

9 . The positive electrode active material of claim 7 , wherein the lithium composite transition metal oxide comprises aluminum in an amount ranging from 1,000 ppm to 9,000 ppm based on a total weight.

10 . The positive electrode active material of claim 7 , wherein the positive electrode active material has an average particle diameter (D 50 ) ranging from 3 μm to 20 μm.

11 . A positive electrode comprising the positive electrode active material of claim 7 .

12 . A lithium secondary battery comprising the positive electrode of claim 11 .

Assignees

• Lg Chemical Ltd

Inventors

• Ha Seoung Chul
• Lee Seong Min
• You Min Kyu
• Lee June Woo
• Lee Kyung Lok
• Shin Ji A
• Heo Un Seon
• Do Joong Yeop

Classifications

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525

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

• C01P2006/40

  Electric properties · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2002/52

  containing elements as dopants · CPC title