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

Patent metadata

Field	Value
Publication number	US-2025266444-A1
Application number	US-202519057451-A
Country	US
Kind code	A1
Filing date	Feb 19, 2025
Priority date	Feb 19, 2024
Publication date	Aug 21, 2025
Grant date	—

Abstract

A cathode active material for a lithium secondary battery according to embodiments of the present disclosure includes lithium-transition metal oxide particles which have a crystal grain size of 350 nm to 450 nm measured through X-ray diffraction (XRD) analysis and an XRD peak intensity ratio of 10% to 11%. A lithium secondary battery according to embodiments of the present disclosure includes a cathode which comprises the cathode active material for a lithium secondary battery and an anode disposed to face the cathode.

First claim

What is claimed is:

1 . A cathode active material for a lithium secondary battery comprising:
lithium-transition metal oxide particles which have a crystal grain size of 350 nm to 450 nm measured by X-ray diffraction (XRD) analysis, and an XRD peak intensity ratio of 10% to 11% defined by Equation 1 below:

XRD
⁢

peak
⁢

intensity
⁢

ratio
⁢

(
%
)

=

100
×

I
⁡
(
110
)

/

{

I
⁡
(
110
)

+

I
⁡
(
003
)

}

[

Equation
⁢

1

]

(in Equation 1, I(110) is a maximum height of a peak of a (110) plane of the lithium-transition metal oxide particles by the XRD analysis, and I(003) is a maximum height of a peak of a (003) plane by the XRD analysis).

2 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the crystal grain size is measured through Equation 2 below:

L
=

0.9
λ

β
⁢
cos
⁢
θ

[

Equation
⁢

2

]

(in Equation 2, L is the crystal grain size(nm), λ is an X-ray wavelength(nm), β is a full width at half maximum of the peak of the (003) plane(rad), and θ is a diffraction angle(rad)).

3 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the XRD peak intensity ratio is 10.2% to 10.8%.

4 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the crystal grain size is 400 nm to 450 nm.

5 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the crystal grain size is 407 nm to 440 nm.

6 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium-transition metal oxide particles comprise nickel, and
a ratio of a total number of moles of nickel in the lithium-transition metal oxide particles to a total number of moles of metals except for lithium in the lithium-transition metal oxide particles is 0.9 or more.

7 . The cathode active material for a lithium secondary battery according to claim 6 , wherein the ratio of the total number of moles of nickel in the lithium-transition metal oxide particles to the total number of moles of metals except for lithium in the lithium-transition metal oxide particles is 0.94 or more.

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

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

10 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium-transition metal oxide particles comprise a coating element or a doping element, and
the coating element or the doping element comprises at least one selected from the group consisting of Na, Mg, Ca, Y, Ti, Hf, V, Nb, Ta, Cr, Mo, W, Fe, Cu, Ag, Zn, B, Al, Ga, C, Si, Sn, Sr, Ba, Ra, P and Zr.

11 . A lithium secondary battery comprising:
a cathode which comprises the cathode active material for a lithium secondary battery of claim 1 ; and an anode disposed to face the cathode.

Assignees

• Sk On Co Ltd

Inventors

• Lee Sang Han
• Koo Chan Woo
• Kim Eun Bi
• Lee Sang Wook

Classifications

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01G53/44

  containing manganese · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0525

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