Positive electrode active material for lithium battery and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2025316685-A1
Application number	US-202418820461-A
Country	US
Kind code	A1
Filing date	Aug 30, 2024
Priority date	Apr 4, 2024
Publication date	Oct 9, 2025
Grant date	—

Abstract

A positive electrode active material for a lithium secondary battery comprises a core component with a lithium transition metal oxide and a coating layer on the core component's surface. The material meets the condition 0.5<A/B<0.8, where A is the normalized intensity of the L3 high peak in a Ni L3-edge spectrum of the positive electrode active material, and B is the normalized intensity of the L3 high peak in a Ni L3-edge spectrum of the core component. The invention includes a positive electrode for a lithium secondary battery, comprising the described active material and a sulfide-based solid electrolyte, and optionally a conductive material. Additionally, a lithium secondary battery comprises the positive electrode active material. The manufacturing method involves preparing the core component, mixing it with a coating precursor to form a starting material, and thermally treating the starting material to form the positive electrode active material, ensuring the condition 0.5<A/B<0.8 is met.

First claim

What is claimed is:

1 . A positive electrode active material for a lithium secondary battery, the positive electrode active material comprising:
a core component comprising a lithium transition metal oxide; and a coating layer that coats a surface of the core component, wherein the positive electrode active material satisfies Condition 1 below,

0.5
<

A
/
B

<

0
.
8

[

Condition
⁢

1

]

wherein A is an intensity of an L3 high peak when a Ni L3-edge spectrum secured by analyzing the positive electrode active material by using an X-ray absorption spectroscopy is normalized, and
wherein B is an intensity of an L3 high peak when a Ni L3-edge spectrum secured by analyzing the core component by using the X-ray absorption spectroscopy is normalized.

2 . The positive electrode active material of claim 1 , wherein the core component comprises the lithium transition metal oxide represented by Chemical Formula 1 below,

wherein Chemical Formula 1 satisfies 0<x<0.25, 0<y<0.2, 0≤z<0.15, and x+y+z≤0.4.

3 . The positive electrode active material of claim 1 , wherein the coating layer comprises a compound represented by Chemical Formula 2 below,

wherein in Chemical Formula 2, the M comprises at least one selected from the group consisting of niobium (Nb), tantalum (Ta), boron (B), zirconium (Zr), phosphorus (P), and a combination thereof.

4 . The positive electrode active material of claim 1 , wherein the positive electrode active material comprises:
at least about 98% by weight and less than about 99% by weight of the core component; and more than about 1% by weight and equal to or less than about 2% by weight of the coating layer.

5 . The positive electrode active material of claim 1 , wherein the positive electrode active material satisfies Condition 2,

0
.
6

<

A
/
B

<

0.8
.

[

Condition
⁢

2

]

6 . The positive electrode active material of claim 5 , wherein the positive electrode active material satisfies Condition 3,

0
.
6

⁢
5

≤

A
/
B

≤

0
.
7

⁢

7
.

[

Condition
⁢

3

]

7 . The positive electrode active material of claim 1 , wherein the core component is in the form of a secondary particle in which primary particles including the lithium transition metal oxide are agglomerated.

8 . The positive electrode active material of claim 7 , wherein the primary particles are formed of a single grain or a plurality of grains.

9 . The positive electrode active material of claim 1 , wherein the average particle diameter (D50) of the core component is between about 1 μm and about 20 μm.

10 . A positive electrode for a lithium secondary battery, the positive electrode comprising:
the positive electrode active material of claim 1 ; and a sulfide-based solid electrolyte.

11 . The positive electrode of claim 10 further comprising a conductive material.

12 . A lithium secondary battery comprising the positive electrode active material of claim 1 .

13 . A manufacturing method of a positive electrode active material for a lithium secondary battery, the manufacturing method comprising:
preparing a core component comprising a lithium transition metal oxide; preparing a starting material comprising the core component and a coating precursor; and producing the positive electrode active material comprising the core component and a coating layer that coats a surface of the core component by thermally treating the starting material, wherein the manufacturing method satisfies Condition 1 below,

0.5
<

A
/
B

<

0
.
8

[

Condition
⁢

1

]

A is an intensity of an L3 high peak when a Ni L3-edge spectrum secured by analyzing the positive electrode active material by using an X-ray absorption spectroscopy is normalized, and
B is an intensity of an L3 high peak when a Ni L3-edge spectrum secured by analyzing the core component by using the X-ray absorption spectroscopy is normalized.

14 . The manufacturing method of claim 13 , wherein the manufacturing method satisfies Condition 2,

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Research & Business Found Sungkyunkwan Univ

Inventors

• Seo Jeong Hyun
• Min Hong Seok
• Noh Sung Woo
• Park Je Sik
• Seo Im Sul
• Lee Yong Seok
• Lee Joo Young
• Seong Ju Yeong
• Lim Chung Bum
• Yoon Won Sub
• Seok Jang Whan
• Lee Hyun Beom

Classifications

• C01P2006/40

  Electric properties · CPC title

• C01P2002/70

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

• C01P2004/61

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

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title

• H01M2004/028

  Positive electrodes · CPC title