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

Patent metadata

Field	Value
Publication number	US-2025260000-A1
Application number	US-202218706213-A
Country	US
Kind code	A1
Filing date	Nov 2, 2022
Priority date	Nov 3, 2021
Publication date	Aug 14, 2025
Grant date	—

Abstract

A positive electrode material includes a positive electrode active material comprising-including a lithium nickel-based oxide having a mole fraction of nickel of 50 mol % to 90 mol % among metallic elements excluding lithium, and a coating layer including boron (B), which is formed on the surface of the lithium nickel-based oxide, wherein the positive electrode material has a BET specific surface area of 0.2 m2/g to 0.4 m2/g, and the boron (B) is included in an amount of 500 ppm to 1,000 ppm based on the total weight of the positive electrode material.

First claim

1 . A positive electrode material comprising:
a positive electrode active material comprising a lithium nickel-based oxide having a mole fraction of nickel of 50 mol % to 90 mol % among metallic elements excluding lithium; and a coating layer comprising boron (B) formed on a surface of the lithium-based oxide, wherein the positive electrode material has a BET specific surface area of 0.2 m 2 /g to 0.4 m 2 /g, and the boron (B) is included in an amount ranging from 500 ppm to 1,000 ppm based on a total weight of the positive electrode material.

2 . The positive electrode material of claim 1 , wherein the lithium nickel-based oxide has a composition represented by Formula 1 below:
Li x [Ni a CO b Mn c M 1 l]O 2   [Formula 1]
wherein, M 1 is at least one selected from the group consisting of Zr, W, Y, Ba, Ca, Ti, Mg, Ta, and Nb, and 0.8≤x≤1.2, 0.5≤a≤0.9, 0<b<0.5, 0<c<0.5, and 0≤d≤0.2 are satisfied.

3 . The positive electrode material of claim 2 , wherein M 1 is Zr.

4 . The positive electrode material of claim 23 , wherein Zr is included in an amount ranging from 4,000 ppm to 5,000 ppm based on the total weight of the positive electrode material.

5 . The positive electrode material of claim 1 , wherein the coating layer further comprises tungsten (W).

6 . The positive electrode material of claim 5 , wherein the tungsten (W) is included in an amount of 4,000 ppm or less based on the total weight of the positive electrode material.

7 . The positive electrode material of claim 1 , wherein the positive electrode active material has a crystalline grain size ranging from 90 nm to 110 nm.

8 . The positive electrode material of claim 1 , wherein the positive electrode active material is a secondary particle in which multiple primary particles are aggregated, and
the primary particles have an average particle diameter ranging from 500 nm to 1 μm.

9 . The positive electrode material of claim 1 , wherein the positive electrode material has a bimodal particle size distribution.

10 . The positive electrode material of claim 9 , wherein the positive electrode material comprises a large particle-diameter positive electrode active material having an average particle diameter D50 of 8 μm or more and a small particle-diameter positive electrode active material having an average particle diameter D50 of 6 μm or less.

11 . The positive electrode material of claim 10 , wherein the large particle-diameter positive electrode active material and the small particle-diameter positive electrode active material are included in a weight ratio of 9:1 to 6:4.

12 . A positive electrode comprising the positive electrode material according to claim 11 .

13 . A lithium secondary battery comprising the positive electrode of claim 12 .

14 . The positive electrode material of claim 1 , wherein the lithium nickel-based oxide is lithium nickel cobalt manganese oxide doped with Zr.

15 . A method of making the positive electrode material comprising:
preparing a lithium nickel-based oxide having a mole fraction of nickel of 50 mol % to 90 mol % among metallic elements excluding lithium; and forming a coating layer comprising boron (B) on a surface of the lithium-based oxide, wherein the positive electrode material has a BET specific surface area of 0.2 m 2 /g to 0.4 m 2 /g. and the boron (B) is included in an amount ranging from 500 ppm to 1.000 ppm based on a total weight of the positive electrode material.

Assignees

• Lg Energy Solution Ltd

Inventors

• Han Gi Beom
• Kim Jong Woo
• Lee Sang Wook
• Kim Hak Yoon
• Baek So Ra
• Lho Eun Sol
• Han Jung Min
• Jung Hae Jung
• Jung Wang Mo
• Lee Young Hwan
• Chung Dae Sik
• Park Su Han

Classifications

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/525

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

• C01P2006/40

  Electric properties · CPC title

• C01P2006/12

  Surface area · CPC title