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

Patent metadata

Field	Value
Publication number	US-2025006906-A1
Application number	US-202418756937-A
Country	US
Kind code	A1
Filing date	Jun 27, 2024
Priority date	Jun 30, 2023
Publication date	Jan 2, 2025
Grant date	—

Abstract

A positive electrode active material includes a lithium composite transition metal oxide in the form of a single particle composed of one single nodule and/or in the form of a pseudo-single particle, which is a composite of 30 or less nodules, and a coating layer formed on the surface of the lithium composite transition metal oxide particle. The coating layer contains aluminum (Al) and tungsten (W). The positive electrode active material satisfies Equation 1 below:
45≤X×X′≤56  [Equation 1]
wherein, X is the content of nickel among all metals except for lithium in the lithium composite transition metal oxide (unit: mol %), and X′ is the BET specific surface area of the positive electrode active material (unit: m 2 /g).

First claim

1 . A positive electrode active material comprising:
a plurality of a lithium composite transition metal oxide in the form of a single particle composed of one single nodule and/or in the form of a pseudo-single particle, wherein the pseudo-single particle is a composite of 30 or less nodules; and a coating layer formed on a surface of the lithium composite transition metal oxide, wherein: the coating layer contains aluminum (Al) and tungsten (W), and the positive electrode active material satisfies Equation 1 below:

45
≤

X
×

X
′

≤
56

[

Equation
⁢

1

]

wherein, X is a content of nickel among all metals except for lithium in the lithium composite transition metal oxide (unit: mol %), and X′ is a BET specific surface area of the positive electrode active material (unit: m 2 /g).

2 . The positive electrode active material of claim 1 , wherein the lithium composite transition metal oxide has a nickel content of 50 mol % to 80 mol % among all metals except for lithium.

3 . The positive electrode active material of claim 1 , wherein the positive electrode active material has a BET specific surface area of 0.70 m 2 /g to 0.90 m 2 /g.

4 . The positive electrode active material of claim 1 , wherein the aluminum (Al) is included in an amount of 1000 ppm to 2000 ppm based on the total weight of the positive electrode active material.

5 . The positive electrode active material of claim 1 , wherein the tungsten (W) is included in an amount of 2000 ppm to 3000 ppm based on the total weight of the positive electrode active material.

6 . The positive electrode active material of claim 1 , wherein a total amount of the aluminum (Al) and the tungsten (W) included in the positive electrode active material is from 3500 ppm to 5000 ppm based on a total weight of the positive electrode active material.

7 . The positive electrode active material of claim 1 , wherein the lithium composite transition metal oxide has a composition represented by Formula 1 below:
Li a Ni b Co c M 1 d M 2 e O 2   [Formula 1]
wherein, M 1 is at least one selected from the group consisting of Mn and Al, M 2 is at least one selected from the group consisting of Ti, Mg, Zr, Y, Ba, Ca, Sr, W, Ta, Nb, and Mo, and 1.0≤a≤1.5, 0.5≤b≤0.8, 0<c<0.5, 0<d<0.5, and 0≤e≤0.2.

8 . The positive electrode active material of claim 1 , wherein the positive electrode active material has a D 50 of 3.0 μm to 5.0 μm.

9 . The positive electrode active material of claim 1 , wherein the positive electrode active material has a tap density of 2.20 g/cc or greater.

10 . The positive electrode active material of claim 1 , wherein the positive electrode active material further comprises at least one of Zr, Y, Ti, or Sr.

11 . The positive electrode active material of claim 1 , wherein the positive electrode active material further comprises at least one of Zr in an amount of 2000 ppm to 3000 ppm, Y in an amount of 1000 ppm to 1500 ppm, Ti in an amount of 1000 ppm to 1500 ppm, or Sr in an amount of 300 ppm to 1000 ppm based on a total weight of the positive electrode active material.

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

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

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Jong Woo
• Ju Ji Young
• Yoo Tae Gu
• Yoo Seung Su
• Park Byung Chun
• Jo Chi Ho

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/021

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

• H01M10/052

  Li-accumulators · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title