Cathode active material precursor, cathode active material, lithium secondary battery and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2025273670-A1
Application number	US-202519205882-A
Country	US
Kind code	A1
Filing date	May 12, 2025
Priority date	Aug 18, 2020
Publication date	Aug 28, 2025
Grant date	—

Abstract

A cathode active material precursor according to embodiments of the present invention includes a composite hydroxide particle in which primary precursor particles are aggregated. The primary precursor particles include a particle having a triangular shape in which a minimum interior angle is 30° or more and a ratio of a length of a short side relative to a length of a long side is 0.5 or more. A cathode active material and a lithium secondary having improved high temperature stability is provided using the cathode active material precursor.

First claim

What is claimed is:

1 . A method of manufacturing a cathode active material precursor, comprising:
preparing a reaction solution containing a metal source; and forming a co-precipitate through a co-precipitation reaction in the reaction solution, wherein a solid content in the reaction solution is 50 wt % or more after the co-precipitation reaction, and wherein the co-precipitation reaction is performed under a condition in which a pH value is changed from 11.8 or more to 10.8 or less.

2 . The method of claim 1 , wherein a composite hydroxide particle is formed in which primary precursor particles are aggregated by the co-precipitation reaction, and the primary precursor particles include a particle having a triangular shape in which a minimum interior angle is 30° or more and a ratio of a length of a short side relative to a length of a long side is 0.5 or more and
wherein the composite hydroxide particle is formed to have a specific surface area of 1.5 m2/g or less.

3 . The method of claim 2 , wherein the ratio of the length of the short side relative to the length of the long side is 0.8 or more.

4 . The method of claim 2 , wherein the composite hydroxide particle is formed to have a specific surface area of 1 m2/g or less.

5 . The method of claim 1 , the co-precipitation reaction is performed at an oxygen concentration of 0.1% or less.

6 . The method of claim 1 , wherein the co-precipitation reaction is performed for 120 hours or more.

7 . The method of claim 2 , wherein the composite hydroxide particle contains an excess of nickel among metals included therein.

8 . The method of claim 7 , wherein a molar ratio of nickel in the metals included in the composite hydroxide particle is 0.8 or more.

9 . The method of claim 7 , wherein the composite hydroxide particle further includes cobalt.

10 . The method of claim 7 , wherein the composite hydroxide particle further includes manganese.

11 . The method of claim 2 , wherein the composite hydroxide particle is represented by Chemical Formula 1:
NiαCoβMγ(OH)z  [Chemical Formula 1]
wherein in Chemical Formula 1, M includes at least one selected from the group consisting of Mg, Sr, Ba, B, Al, Si, Mn, Ti, Zr and W, 0.8≤α≤0.95, 0≤γ/(α+β)≤0.13, 0≤γ≤0.11 and 1.9≤z≤2.1.

12 . A method of manufacturing a cathode active material for a secondary battery, comprising:
preparing the cathode active material precursor by the method of claim 1 ; forming a preliminary lithium composite oxide particle by reacting the cathode active material precursor with a lithium source; and post-treating the preliminary lithium composite oxide particle.

13 . The method of claim 12 , wherein the preliminary lithium composite oxide particle has a specific surface area of 0.12 m2/g or less.

14 . The method of claim 12 , wherein the post-treating comprises at least one of coating, heat-treating, washing and drying.

15 . The method of claim 12 , wherein the forming the preliminary lithium composite oxide particle comprises firing after reacting the cathode active material precursor with the lithium source.

Assignees

• Sk On Co Ltd

Inventors

• Kim Jik Soo
• Choi Ji Hoon
• Han Kook Hyun

Classifications

• H01M10/0525

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

• H01M4/0471

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

• H01M4/0497

  Chemical precipitation · CPC title

• H01M4/505

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

• C01G53/82

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title