Cathode Active Material for Lithium Secondary Battery, Cathode Including the Same, and Lithium Secondary Battery Including the Same

Patent metadata

Field	Value
Publication number	US-2025372694-A1
Application number	US-202519223584-A
Country	US
Kind code	A1
Filing date	May 30, 2025
Priority date	Jun 3, 2024
Publication date	Dec 4, 2025
Grant date	—

Abstract

A cathode active material for a lithium secondary battery according to embodiments of the present disclosure includes lithium-metal oxide particles having a sphericity of 0.96 or less and an elongation of 0.25 to 0.5. The elongation is calculated as (1−b/a). Here, a denotes the length of the major axis of the lithium-metal oxide particle in a cross-sectional image of the lithium-metal oxide particles observed using SEM, and b denotes the length of the minor axis of the lithium-metal oxide particle in the cross-sectional SEM image of the lithium-metal oxide particles.

First claim

What is claimed is:

1 . A cathode active material for a lithium secondary battery, comprising lithium-metal oxide particles which have a sphericity of 0.96 or less, and an elongation of 0.25 to 0.5 according to Equation 1 below:

Elongation
=

1
-

b
/
a

[

Equation
⁢

1

]

(in Equation 1 above, a denotes the length of a major axis of the lithium-metal oxide particle in a cross-sectional SEM image of the lithium-metal oxide particles, and b denotes the length of a minor axis of the lithium-metal oxide particle in the cross-sectional SEM image).

2 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium-metal oxide particles have a sphericity of 0.85 to 0.96.

3 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium-metal oxide particles have a sphericity of 0.89 to 0.93.

4 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium-metal oxide particles have an elongation of 0.30 to 0.40.

5 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium-metal oxide particles comprise nickel, cobalt and manganese.

6 . The cathode active material for a lithium secondary battery according to claim 5 , wherein a content of nickel in the lithium-metal oxide particles is 80 mol % to 99 mol % based on the total number of moles of metals excluding lithium.

7 . The cathode active material for a lithium secondary battery according to claim 5 , wherein a content of manganese in the lithium-metal oxide particles is 0.1 mol % to 7 mol % based on the total number of moles of metals excluding lithium.

8 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium metal oxide particles have a secondary particle form.

9 . The cathode active material for a lithium secondary battery according to claim 1 , wherein, in Equation 1, a is 10 μm to 32 μm.

10 . The cathode active material for a lithium secondary battery according to claim 1 , wherein, in Equation 1, b is 5 μm to 16 μm.

11 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium metal oxide particles have a mean particle diameter (D50) of 10 μm to 24 μm.

12 . A cathode for a lithium secondary battery comprising the cathode active material for a lithium secondary battery according to claim 1 .

13 . The cathode for a lithium secondary battery according to claim 12 , wherein a ratio of the number of the lithium-metal oxide particles to the total number of particles included in the cathode for a lithium secondary battery is 60% or more.

14 . The cathode for a lithium secondary battery according to claim 12 , wherein the cathode has an electrode density in the range of 3.4 g/cc to 4.0 g/cc.

15 . A lithium secondary battery comprising:
the cathode for a lithium secondary battery according to claim 12 ; and an anode disposed opposite to the cathode.

Assignees

• Sk On Co Ltd

Inventors

• Choi Jae Ho
• Son Byoung Ki
• Lee Ha Eun
• Choi Ji Hoon

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/021

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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525 Primary

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