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

Patent metadata

Field	Value
Publication number	US-2025210650-A1
Application number	US-202418987893-A
Country	US
Kind code	A1
Filing date	Dec 19, 2024
Priority date	Dec 22, 2023
Publication date	Jun 26, 2025
Grant date	—

Abstract

A positive electrode material includes a positive electrode active material that includes: lithium nickel-based oxide particles in the form of secondary particles as agglomerates of primary particles, in which among all metals excluding lithium, the content of Ni is 50 mol % to 90 mol %; and a boron (B)-containing coating layer formed on the surface of the lithium nickel-based oxide particles. The BET specific surface area of the positive electrode material is about 0.41 m 2 /g to 0.59 m 2 /g, and the average crystallite size of the positive electrode material is about 155 nm or more.

First claim

What is claimed is:

1 . A positive electrode material comprising:
a positive electrode active material that includes:
lithium nickel-based oxide particles in a form of secondary particles as agglomerates of primary particles, in which among all metals excluding lithium, a content of Ni is 50 mol % to 90 mol %; and
a boron (B)-containing coating layer formed on a surface of the lithium nickel-based oxide particles,
wherein a BET specific surface area of the positive electrode material is about 0.41 m 2 /g to 0.59 m 2 /g, and an average crystallite size of the positive electrode material is about 155 nm or more.

2 . The positive electrode material according to claim 1 , wherein the average crystallite size of the positive electrode material is about 155 nm to 170 nm.

3 . The positive electrode material according to claim 1 , wherein the lithium nickel-based oxide particles are represented by the following formula 1:
Li a [Ni b Co c M 1 d M 2 e ]O 2   [Formula 1]
In the formula 1, M 1 is Mn, Al or a combination thereof, M 2 is at least one type selected from Ti, Mg, Al, Zr, Y, Ba, Ca, Sr, W, Ta, Nb, and Mo, and a satisfies numerical ranges of about 0.80≤a≤1.20, 0.50≤b≤0.90, 0<c≤0.40, 0<d≤0.40, and 0≤e≤0.10.

4 . The positive electrode material according to claim 1 , wherein the boron (B) is included in an amount of about 500 ppm to 1000 ppm with respect to the total weight of the positive electrode material.

5 . The positive electrode material according to claim 1 , wherein a residual lithium amount in the positive electrode material is about 0.2 wt % to 0.4 wt %.

6 . The positive electrode material according to claim 1 , wherein a cation mixing ratio of the positive electrode material is about 2.5 at % or less.

7 . The positive electrode material according to claim 1 , comprising large particles having an average particle size D 50 of about 6 μm to 20 μm, and small particles having an average particle size D 50 of about 0.1 μm to 5.5 μm.

8 . The positive electrode material according to claim 7 , wherein the large particles and the small particles are included at a weight ratio of about 60:40 to 80:20.

9 . A positive electrode comprising the positive electrode material according to claim 1 .

10 . A lithium secondary battery comprising the positive electrode according to claim 9 .

11 . A secondary battery pack comprising the lithium secondary battery according to claim 10 as a unit cell.

12 . An electric vehicle comprising the secondary battery pack according to claim 11 .

13 . A method of manufacturing a positive electrode material, the method comprising:
determining a BET specific surface area and an average crystallite size of a positive electrode active material included in the positive electrode material; determining a BET specific surface area and an average particle size of a precursor used when the positive electrode active material is prepared; determining molar ratios of lithium and transition metals when the precursor is fired; and determining a firing temperature and a content of a coating element when the positive electrode active material and the positive electrode material are prepared.

14 . The method according to claim 13 , wherein the positive electrode material includes the positive electrode active material including: lithium nickel-based oxide particles in a form of secondary particles as agglomerates of primary particles, in which among all metals excluding lithium, a content of Ni is 50 mol % to 90 mol %; and a boron (B)-containing coating layer formed on a surface of the lithium nickel-based oxide particles,
the BET specific surface area of the positive electrode material is about 0.41 m 2 /g to 0.59 m 2 /g, and the average crystallite size of the positive electrode material is about 155 nm or more.

Assignees

• Lg Energy Solution Ltd

Inventors

• Oh Su Yeon
• Lee Seok Jin
• Eho Eun Sol
• Hwang Jin Tae
• Kim Hyeong Ll

Classifications

• H01M4/366

  as layered products · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2220/20

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

• H01M4/505

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

• H01M10/0525

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