Positive Electrode Material, and Positive Electrode and Lithium Secondary Battery Which Include the Same

Patent metadata

Field	Value
Publication number	US-2025183290-A1
Application number	US-202318842213-A
Country	US
Kind code	A1
Filing date	Mar 29, 2023
Priority date	Mar 29, 2022
Publication date	Jun 5, 2025
Grant date	—

Abstract

A positive electrode material for a lithium secondary battery includes a large-particle diameter positive electrode active material and a small-particle diameter positive electrode active material, wherein the large-particle diameter positive electrode active material and the small-particle diameter positive electrode active material each independently include a lithium nickel-based oxide, when a cation mixing ratio of the large-particle diameter positive electrode active material is Ml and a cation mixing ratio of the small-particle diameter positive electrode active material is Ms, Ml/Ms is in a range of 0.6 to 4.0, and, when an average particle diameter of primary particles of the large-particle diameter positive electrode active material is Pl and an average particle diameter of primary particles of the small-particle diameter positive electrode active material is Ps, Pl/Ps is in a range of 0.1 to 2.0. A lithium secondary battery including the positive electrode material is also provided.

First claim

1 . A positive electrode material for a lithium secondary battery, comprising:
a large-particle diameter positive electrode active material and a small-particle diameter positive electrode active material, wherein the large-particle diameter positive electrode active material and the small-particle diameter positive electrode active material each independently comprise a lithium nickel-based oxide, wherein a ratio (Ml/Ms) of a cation mixing ratio of the large-particle diameter positive electrode active material (Ml) and a cation mixing ratio of the small-particle diameter positive electrode active material (Ms) is in a range of 0.6 to 4.0, and wherein a ratio (Pl/Ps) of an average particle diameter of primary particles of the large-particle diameter positive electrode active material (Pl) and an average particle diameter of primary particles of the small-particle diameter positive electrode active material (Ps) is in a range of 0.1 to 2.0.

2 . The positive electrode material of claim 1 , wherein D50 of the large-particle diameter positive electrode active material is in a range of 8 μm to 18 μm.

3 . The positive electrode material of claim 1 , wherein D50 of the small-particle diameter positive electrode active material is in a range of 2 μm to 7 μm.

4 . The positive electrode material of claim 1 , wherein the large-particle diameter positive electrode active material and the small-particle diameter positive electrode active material each independently comprises a single particle; a secondary particle in which a plurality of the primary particles are aggregated; or a combination thereof.

5 . The positive electrode material of claim 1 , wherein the average particle diameter of the primary particles of the large-particle diameter positive electrode active material is in a range of 0.2 μm to 1.0 μm.

6 . The positive electrode material of claim 1 , wherein the average particle diameter of the primary particles of the small-particle diameter positive electrode active material is in a range of 0.5 μm to 2.0 μm.

7 . The positive electrode material of claim 1 , wherein, a ratio (Bl/Bs) of a specific surface area of the large-particle diameter positive electrode active material (Bl) and a specific surface area of the small-particle diameter positive electrode active material (Bs) is in a range of 0.15 to 1.6.

8 . The positive electrode material of claim 1 , wherein the large-particle diameter positive electrode active material and the small-particle diameter positive electrode active material each comprise a lithium nickel-based oxide represented by Formula 1:
Li 1+x (Ni a Co b Mn c M d )O 2-y   [Formula 1]
wherein, in Formula 1, M is at least one selected from the group consisting of aluminum (Al), magnesium (Mg), vanadium (V), titanium (Ti), zirconium (Zr), niobium (Nb), and tungsten (W), and x, a, b, c, and d respectively satisfy −0.10≤x≤0.20, 0.50≤a≤1.0, 0<b≤0.40, 0<c≤0.30, 0≤d≤0.05, a+b+c+d=1, and 0≤y≤0.05.

9 . The positive electrode material of claim 1 , wherein the large-particle diameter positive electrode active material and the small-particle diameter positive electrode active material each comprises the lithium nickel-based oxide in which a molar ratio of nickel among transition metals is 70 mol % or more.

10 . The positive electrode material of claim 1 , wherein the positive electrode material comprises the large-particle diameter positive electrode active material and the small-particle diameter positive electrode active material in a weight ratio of 50:50 to 90:10.

11 . The positive electrode material of claim 1 , wherein the cation mixing ratio of the large-particle diameter positive electrode active material is in a range of 1.0 at % to 2.0 at %.

12 . The positive electrode material of claim 1 , wherein the cation mixing ratio of the small-particle diameter positive electrode active material is in a range of 0.5 at % to 1.5 at %.

13 . A positive electrode for a lithium secondary battery, comprising the positive electrode material of claim 1 .

14 . A lithium secondary battery comprising the positive electrode of claim 13 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Park Sang Min
• Kim Seul Ki
• Kim Hyeong Ii
• Lee Sang Wook
• Han Gi Beom
• Kim Jong Woo
• Lho Eun Sol

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525

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

• H01M4/364

  as mixtures · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M2004/021

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