Cathode active material for lithium secondary battery and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-12371345-B2
Application number	US-202217672029-A
Country	US
Kind code	B2
Filing date	Feb 15, 2022
Priority date	Feb 16, 2021
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

The present invention provides a cathode active material for a secondary battery, which includes a lithium metal oxide particle having a form of a secondary particle in which a plurality of primary particles are agglomerated, wherein the primary particles comprise a particle having a triangular shape which has a size of a minimum internal angle of 45° or more and a maximum height of 0.5 μm or more.

First claim

What is claimed is:

1. A cathode active material for a secondary battery, comprising:
a lithium metal oxide particle having a form of a secondary particle in which a plurality of primary particles are agglomerated,
wherein the primary particles comprise a particle having a triangular shape which has a size of a minimum internal angle of 45° or more and a maximum height ranging from 0.5 μm to 6 μm.

2. The cathode active material for a secondary battery according to claim 1 , wherein the lithium metal oxide particle contains 80 mol % or more of nickel of all elements except for lithium and oxygen.

3. The cathode active material for a secondary battery according to claim 1 , wherein the lithium metal oxide particle is represented by Formula 1 below:
Li x Ni a Co b M c O z   [Formula 1]

(in Formula 1, M is at least one of Mg, Sr, Ba, B, Al, Si, Mn, Ti, Zr and W, and x, a, b, c and z are in a range of 0.9<x<1.2, 0.8≤a≤0.98, 0≤c/(a+b)≤0.25, 0≤c≤0.2, and 1.9≤z≤2.1, respectively).

4. The cathode active material for a secondary battery according to claim 1 , wherein the size of the minimum internal angle of the triangular shape is 45° to 60°.

5. The cathode active material for a secondary battery according to claim 1 , wherein the maximum height of the triangular shape is 1 to 4 μm.

6. The cathode active material for a secondary battery according to claim 1 , wherein the lithium metal oxide particle has a particle size (D 50 ) of 3 to 20 μm.

7. A lithium secondary battery comprising:
a cathode comprising the cathode active material according to claim 1 ; and
an anode disposed to face the cathode.

Assignees

• Sk On Co Ltd

Inventors

• Kim Jik Soo
• Choi Ji Hoon
• Kim Sang Bok

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/525 Primary

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

• H01M10/0525

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

• C01P2004/61

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

• C01P2004/50

  Agglomerated particles · CPC title