Positive Electrode Active Material, Positive Electrode Slurry Including the Same, Positive Electrode, and Lithium Secondary Battery

Patent metadata

Field	Value
Publication number	US-2025273669-A1
Application number	US-202519201301-A
Country	US
Kind code	A1
Filing date	May 7, 2025
Priority date	Dec 2, 2022
Publication date	Aug 28, 2025
Grant date	—

Abstract

A positive electrode active material includes a lithium nickel-based oxide which is a single particle composed of one single nodule, a quasi-single particle which is a composite of at most 30 nodules, or a combination thereof. The positive electrode active material has a D 90 ranging from 8.0 μm to 11.5 μm, and a negative skewness factor (NSF) represented by Equation 1 below ranges from 0.20 to 0.35:

NSF
=

(

D

5
⁢
0

-

D

1
⁢
0

)

/

I
max

[

Equation
⁢

1

]

D 50 is a particle diameter at a cumulative volume of 50% in a volume cumulative particle size distribution graph of the positive electrode active material. D 10 is a particle diameter at a cumulative volume of 10% in a volume cumulative particle size distribution graph of the positive electrode active material. I max is a maximum volume fraction in the volume cumulative particle size distribution graph of the positive electrode active material.

First claim

1 . A positive electrode active material, comprising:
a lithium nickel-based oxide which is a single particle composed of one single nodule, a quasi-single particle which is a composite of at most 30 nodules, or a combination thereof, wherein the positive electrode active material has a D 90 ranging from 8.0 μm to 11.5 μm, and a negative skewness factor (NSF) represented by Equation 1 below ranges from 0.20 to 0.35:

NSF
=

(

D

5
⁢
0

-

D

1
⁢
0

)

/

I
max

[

Equation
⁢

1

]

wherein, D 50 is a particle diameter at a cumulative volume of 50% in a volume cumulative particle size distribution graph of the positive electrode active material, D 10 is a particle diameter at a cumulative volume of 10% in the volume cumulative particle size distribution graph of the positive electrode active material, and I max is a maximum volume fraction in the volume cumulative particle size distribution graph of the positive electrode active material.

2 . The positive electrode active material of claim 1 , wherein the positive electrode active material has a D 50 ranging from 5.0 μm to 7.0 μm.

3 . The positive electrode active material of claim 1 , wherein the positive electrode active material has a D 10 ranging from 2.5 μm to 3.1 μm.

4 . The positive electrode active material of claim 1 , wherein the lithium nickel-based oxide is represented by Formula 1 below:
Li 1+x Ni a Co b M 1 c M 2 d O 2   [Formula 1]
wherein, M 1 is Mn, Al, or a combination thereof, M 2 is at least one selected from the group consisting of Ba, Ca, Zr, Ti, Mg, Ta, Nb, and Mo, 0≤x≤0.50, 0.80≤a<1.00, 0<b<0.20, 0<c<0.20, and 0≤d≤0.20.

5 . The positive electrode active material of claim 4 , wherein 0.83≤a<1.00, 0<b<0.17, 0<c<0.17, and 0≤d≤0.17.

6 . The positive electrode active material of claim 1 , wherein the positive electrode active material has a tap density of at least 2.32 g/cc.

7 . A positive electrode slurry comprising the positive electrode active material of claim 1 .

8 . The positive electrode slurry of claim 7 , wherein the positive electrode slurry has a solid content ranging from 65 wt % to 75 wt %.

9 . The positive electrode slurry of claim 7 , wherein the positive electrode slurry has a viscosity ranging from 2,000 cp to 5,000 cp as measured at a shear speed of 16 rpm at 40° C.

10 . A positive electrode comprising the positive electrode active material of claim 1 .

11 . A lithium secondary battery comprising the positive electrode of claim 10 .

12 . The lithium secondary battery of claim 11 , wherein the lithium secondary battery has a capacity retention of at least 88% after charging and discharging for 50 cycles, wherein charging the lithium secondary battery to a range of 4.25 V at 0.5 C at 45° C. and discharging the lithium secondary battery to a range of 3.0 V at 1.0 C is one cycle.

Assignees

• Lg Energy Solution Ltd

Inventors

• Oh Su Yeon
• Lho Eun Sol
• Hwang Jin Tae
• Park Byung Chun
• Park Sang Min
• Lee Sang Wook
• Kim Seul Ki
• Kim Hyeong Il

Classifications

• C01P2006/22

  Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability · CPC title

• C01P2002/54

  one element only · CPC title

• C01G53/42

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

• C01G53/506

  with the molar ratio of nickel with respect to all the metals other than alkali metals higher than or equal to 0.8, e.g. Li(MzNixCoyMn1-x-y-z)O2 with x ≥ 0.8 · CPC title

• C01P2006/11

  Powder tap density · CPC title