Positive Electrode Active Material for Lithium Secondary Battery and Positive Electrode Material Mixture, Positive Electrode, Lithium Secondary Battery Comprising the Same

Patent metadata

Field	Value
Publication number	US-2024105934-A1
Application number	US-202218270316-A
Country	US
Kind code	A1
Filing date	Jun 9, 2022
Priority date	Jun 17, 2021
Publication date	Mar 28, 2024
Grant date	—

Abstract

A positive electrode active material for a lithium secondary battery has a mixture of microparticles having a predetermined average particle size (D50) and macroparticles having a larger average particle size (D50) than the microparticles. The microparticles have the average particle size (D50) of 1 to 10 μm and are at least one selected from the group consisting of particles having a carbon material coating layer on all or part of a surface of primary macroparticles having an average particle size (D50) of 1 μm or more, particles having a carbon material coating layer on all or part of a surface of secondary particles formed by agglomeration of the primary macroparticles, and a mixture thereof. The macroparticles are secondary particles having an average particle size (D50) of 5 to 20 μm formed by agglomeration of primary microparticles having a smaller average particle size (D50) than the primary macroparticles. The primary macroparticles and the primary microparticles have a nickel-based lithium transition metal oxide.

First claim

1 . A positive electrode active material for a lithium secondary battery, comprising:
a mixture of microparticles having a predetermined average particle size (D50) and macroparticles having a larger average particle size (D50) than the microparticles, wherein the microparticles have the average particle size (D50) of 1 to 10 μm and are at least one selected from the group consisting of particles having a carbon material coating layer on all or part of a surface of primary macroparticles having an average particle size (D50) of 1 μm or more, particles having a carbon material coating layer on all or part of a surface of secondary particles formed by agglomeration of the primary macroparticles, and a mixture thereof, the macroparticles are secondary particles having an average particle size (D50) of 5 to 20 μm formed by agglomeration of primary microparticles having a smaller average particle size (D50) than the primary macroparticles, and the primary macroparticles and the primary microparticles comprise a nickel-based lithium transition metal oxide.

2 . The positive electrode active material for a lithium secondary battery according to claim 1 , wherein the average particle size (D50) of the primary macroparticles is 1 to 3 μm, and the average particle size (D50) of the microparticles is 3 to 8 μm.

3 . The positive electrode active material for a lithium secondary battery according to claim 1 , wherein an average crystallite size of the primary macroparticles is 150 nm or more.

4 . The positive electrode active material for a lithium secondary battery according to claim 1 , wherein the average particle size (D50) of the primary microparticles is 100 to 900 nm.

5 . The positive electrode active material for a lithium secondary battery according to claim 1 , wherein a ratio of the average particle size (D50) of the macroparticles: the average particle size (D50) of the microparticles is 5:1 to 2:1.

6 . The positive electrode active material for a lithium secondary battery according to claim 1 , wherein the microparticles are present in an amount of 10 to 100 parts by weight based on 100 parts by weight of the macroparticles.

7 . The positive electrode active material for a lithium secondary battery according to claim 1 , wherein the carbon material coating layer is present in an amount of 0.05 to 10 parts by weight based on 100 parts by weight of the primary macroparticles.

8 . The positive electrode active material for a lithium secondary battery according to claim 1 , wherein the nickel-based lithium transition metal oxide is represented by Li a Ni 1-b-c-d Co b Mn c Q d O 2+δ , wherein 1.0≤a≤1.5, 0<b≤0.5, 0<c≤0.5, 0≤d≤0.1, 0<b+c+d≤0.5, −0.1≤δ≤1.0, and Q is at least one type of metal element selected from the group consisting of Al, Mg, V, Ti and Zr.

9 . A positive electrode material mixture for a lithium secondary battery, comprising:
the positive electrode active material for a lithium secondary battery according to claim 1 ; and a conductive material.

10 . The positive electrode material mixture for a lithium secondary battery according to claim 9 , wherein the conductive material is present in an amount of 1 to 30 weight % based on the total weight of the positive electrode material mixture.

11 . A positive electrode for a lithium secondary battery comprising the positive electrode material mixture according to claim 10 .

12 . A lithium secondary battery comprising the positive electrode according to claim 11 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Han Gi-Beom
• Kim Jong-Woo
• Lho Eun-Sol
• Park Kang-Joon
• Kwak Min
• Kim Seul-Ki
• Kim Hyeong-Il
• Park Sang-Min
• Lee Sang-Wook
• Jung Wang-Mo

Classifications

• H01M2004/021

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

• H01M4/366

  as layered products · CPC title

• H01M4/505

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

• H01M4/625

  Carbon or graphite · CPC title