Cathode active material for lithium secondary battery and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-2026005239-A1
Application number	US-202519250068-A
Country	US
Kind code	A1
Filing date	Jun 26, 2025
Priority date	Jun 26, 2024
Publication date	Jan 1, 2026
Grant date	—

Abstract

The present disclosure relates to a cathode active material for a lithium secondary battery and a lithium secondary battery including the same. A cathode active material for a lithium secondary battery according to embodiments of the present disclosure includes lithium-nickel-based metal oxide particles having a FWHM ratio of 2000% or less, as measured by in-situ X-ray diffraction (XRD) and defined by a specific equation.

First claim

What is claimed is:

1 . A cathode active material for a lithium secondary battery, comprising lithium-nickel-based metal oxide particles having an FWHM ratio of 2000% or less, as measured by in-situ x-ray diffraction (XRD) and defined by Equation 1 below:

FWHM
⁢

ratio
⁢

(
%
)

=

100
×

(

FWHM
max

(
107
)

/

FWHM
min

(
107
)

)

[

Equation
⁢

1

]

(in Equation 1, FWHM max (107) is the maximum FWHM value of a (107) plane peak of the lithium-nickel-based metal oxide particles measured by in-situ XRD, and FWHM min (107) is the minimum FWHM value of the (107) plane peak of the lithium-nickel-based metal oxide particles measured by in-situ XRD).

2 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the FWHM ratio is 1000% to 2000%.

3 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the FWHM ratio is 1500% to 1900%.

4 . The cathode active material for a lithium secondary battery according to claim 1 , wherein FWHM max (107) in Equation 1 is 3.7 or less.

5 . The cathode active material for a lithium secondary battery according to claim 1 , wherein FWHM max (107) in Equation 1 is 3.5 or less.

6 . The cathode active material for a lithium secondary battery according to claim 1 , wherein FWHM min (107) in Equation 1 is 0.175 or more.

7 . The cathode active material for a lithium secondary battery according to claim 1 , wherein FWHM min (107) in Equation 1 is 0.185 or more.

8 . The cathode active material for a lithium secondary battery according to claim 1 , wherein changes in the FWHM value of the (107) plane peak of the lithium-nickel-based metal oxide particles during charging and discharging of the lithium secondary battery are measured in real time using in-situ XRD.

9 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium-nickel-based metal oxide particles comprise two or more types of doping elements.

10 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium-nickel-based metal oxide particles have a structure represented by Formula 2 below:

(in Formula 2, M1 and M2 each comprise at least one of Ti, Zr, Al, Mg and W, and 0.8<x<1.5, 0.5≤a≤0.98, 0.02≤b+c≤0.50, 0.02≤c≤0.30, 0<d+e≤0.05, 0.98≤a+b+c≤1.02, −0.1≤y≤0.1).

11 . The cathode active material for a lithium secondary battery according to claim 10 , wherein the molar ratio (d/e) of M1 to M2 in Formula 2 is 0.05≤d/e≤5.5.

12 . The cathode active material for a lithium secondary battery according to claim 10 , wherein the molar ratio (d/e) of M1 to M2 in Formula 2 is 1.25≤d/e≤3.

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

Assignees

• Sk On Co Ltd

Inventors

• Lim Byoung Beom
• Lee Sang Wook
• Lee Sang Han
• Koo Chan Woo
• Kim Eun Bi
• Lee Yoon Ji
• Cho Yong Hyun

Classifications

• H01M10/052

  Li-accumulators · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2002/70

  defined by measured X-ray, neutron or electron diffraction data · CPC title

• C01P2002/52

  containing elements as dopants · CPC title

• C01G53/42 Primary

  containing alkali metals, e.g. LiNiO2 · CPC title