Positive electrode active material

Patent metadata

Field	Value
Publication number	US-2025219070-A1
Application number	US-202318852517-A
Country	US
Kind code	A1
Filing date	Mar 31, 2023
Priority date	Mar 31, 2022
Publication date	Jul 3, 2025
Grant date	—

Abstract

The present invention may provide a cathode active material that exhibits excellent structural stability and lifespan retention rate even in a high-temperature environment where a battery is operating. In addition, the present invention may provide a cathode including an active material layer containing the cathode active material and provide a battery cell including the cathode. In addition, the present invention is aimed at providing a battery cell assembly including the battery cell. In addition, the present invention may provide an electric device including one or more selected from the group consisting of the battery cell and the battery cell assembly.

First claim

1 . A cathode active material comprising a metal composite including lithium compound particles represented by Structural Formula 1 below, wherein R 1 according to Mathematical Formula 1 below is in the range of 0.6 or more to 1 or less, and R 2 according to Mathematical Formula 2 below is in the range of 0.05 or more to 0.8 or less:
Li x Ni a Co b Mn c M 1 d M 2 e O 2+y   [Structural Formula 1]
wherein in Structural Formula 1, 0.95≤x≤1.10, 0.75≤a≤1, 0<b≤0.2, 0<c≤0.2, 0<d≤0.15, 0<e≤0.1, and −0.5≤y≤0.1, and M 1 is a first metal element, M 2 is a second metal element, wherein the first metal element includes one or more selected from the group consisting of Al, Ti, Zr, Sb, and Nb, and the second metal element includes one or more selected from the group consisting of Sr, Mg, Ba, Y, and Ce,

R
1

=

M
1

/
A

[

Mathematical
⁢

Formula
⁢

1

]

wherein in Mathematical Formula 1, M 1 is the percentage by atoms of the first metal element in the lithium compound particles, and A is the percentage by atoms of the first metal element in the metal composite,

R
2

=

W
B

/

W
A

[

Mathematical
⁢

Formula
⁢

2

]

wherein in Mathematical Formula 2, W B is the percentage by weight of the second metal element based on the total weight of the metal composite, and W A is the percentage by weight of the first metal element based on the total weight of the metal composite.

2 . The cathode active material according to claim 1 , wherein the metal composite includes an extra-particle region, and the extra-particle region includes one or more selected from the group consisting of oxides, sulfides, sulfur oxides, fluoroxides, and hydrates of the first metal element.

3 . The cathode active material according to claim 1 , wherein the lithium compound particles include the first metal element in the range of 0.001 mole to 0.1 mole based on 1 mole of total lithium element.

4 . The cathode active material according to claim 1 , wherein the lithium compound particles include the second metal element in the range of 0.0001 mole to 0.05 mole based on 1 mole of total lithium element.

5 . The cathode active material according to claim 1 , wherein in the lithium compound particles, the first metal element includes Al and further includes one or more selected from the group consisting of Ti, Zr, Sb, and Nb.

6 . The cathode active material according to claim 5 , wherein R P according to the following Mathematical Formula P is in the range of 0.1 to 10,000:

R
P

=

N
Al

/

N

M
⁢
1

.

[

Mathematical
⁢

Formula
⁢

P

]

In Mathematical Formula P, N Al is the percentage by mole of Al based on the total number of moles of the metal composite, and N M1 is the combined percentage by mole of Ti, Zr, Sb, and Nb based on the total number of moles of the metal composite.

7 . The cathode active material according to claim 5 , wherein in the lithium compound particles, the first metal element includes Al and Ti, and R Q according to the following Mathematical Formula Q is in the range of 1,000 to 10,000:

R
Q

=

N
Al

/

N
Ti

.

[

Mathematical
⁢

Formula
⁢

Q

]

In Mathematical Formula Q, N Al is the percentage by mole of Al based on the total number of moles of the metal composite, and N Ti is the percentage by mole of Ti based on the total number of moles of the metal composite.

8 . The cathode active material according to claim 5 , wherein in the lithium compound particles, the first metal element includes Al and Zr, and R R according to the following Mathematical Formula R is in the range of 0.1 to 50:

R
R

=

N
Al

Assignees

• Sk On Co Ltd

Inventors

• Noh Mi Jung
• Choi Jae Ho
• Lee Tae Kyoung
• Kang Min Suk
• Hwang Duck Chul

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2004/021

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

• H01M10/052

  Li-accumulators · CPC title

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/366 Primary

  as layered products · CPC title