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

Patent metadata

Field	Value
Publication number	US-12580192-B2
Application number	US-202519233526-A
Country	US
Kind code	B2
Filing date	Jun 10, 2025
Priority date	Aug 18, 2020
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

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 cathode active material precursor comprising a composite hydroxide particle in which primary precursor particles are aggregated,
wherein 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, wherein the composite hydroxide particle has a specific surface area of 1.5 m 2 /g or less.

2 . The cathode active material precursor of claim 1 , the composite hydroxide particle includes an excess amount of nickel among metals included therein.

3 . The cathode active material precursor of claim 2 , wherein the composite hydroxide particle has a specific surface area of 1 m 2 /g or less.

4 . The cathode active material precursor of claim 2 , wherein a molar ratio of nickel in the metals included in the composite hydroxide particle is 0.8 or more.

5 . The cathode active material precursor of claim 2 , wherein the composite hydroxide particle further includes cobalt.

6 . The cathode active material precursor of claim 5 , wherein the composite hydroxide particle further includes manganese.

7 . The cathode active material precursor of claim 1 , 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.

8 . The cathode active material precursor of claim 1 , wherein the ratio of the length of the short side relative to the length of the long side is 0.8 or more.

9 . A cathode active material for a secondary battery, comprising a lithium composite oxide particle formed from the cathode active material precursor of claim 1 .

10 . The cathode active material for a secondary battery of claim 9 , wherein the lithium composite oxide particle has an amorphous shape.

11 . A lithium secondary battery, comprising:
a cathode comprising the cathode active material of claim 9 ; and an anode facing the cathode.

12 . The cathode active material for a secondary battery of claim 9 , wherein the lithium composite oxide particle has a secondary particle structure formed by aggregation of primary particles.

13 . The cathode active material for a secondary battery of claim 12 , wherein an average particle diameter (D50) of the primary particle in a volume-based cumulative distribution of a particle size is in a range from 0.5 μm to 1.2 μm.

14 . The cathode active material for a secondary battery of claim 12 , wherein an average particle diameter (D50) of the secondary particle in a volume-based cumulative distribution of a particle size is in a range from 9 μm to 12 μm.

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