Positive Electrode Active Material for Secondary Battery, Method for Preparing Same, and Lithium Secondary Battery Including Same

Patent metadata

Field	Value
Publication number	US-2025336963-A1
Application number	US-202519261342-A
Country	US
Kind code	A1
Filing date	Jul 7, 2025
Priority date	Feb 28, 2018
Publication date	Oct 30, 2025
Grant date	—

Abstract

A positive electrode active material for a secondary battery includes a lithium complex transition metal oxide and a surface coating portion. The lithium complex transition metal oxide includes nickel (Ni), cobalt (Co), and at least one selected from the group consisting of manganese (Mn) and aluminum (Al). The surface coating portion is formed on surfaces of the lithium complex transition metal oxide particles and the surface coating portion includes a cobalt-rich layer, which has a higher cobalt content than the lithium complex transition metal oxide, and a lithium boron oxide.

First claim

1 . A positive electrode active material for a secondary battery, the positive electrode active material comprising:
a lithium complex transition metal oxide including nickel (Ni), cobalt (Co), and at least one selected from the group consisting of manganese (Mn) and aluminum (Al); and a surface coating portion which is formed on surfaces of the lithium complex transition metal oxide particles, wherein the surface coating portion includes a cobalt-rich layer, which has a higher cobalt content than the lithium complex transition metal oxide, and a lithium boron oxide.

2 . The positive electrode active material of claim 1 ,
wherein the lithium complex transition metal oxide has a nickel (Ni) content of 60 mol % or more with respect to a total transition metal content.

3 . The positive electrode active material of claim 1 , wherein a difference between a ratio of a number of cobalt (Co) atoms to a sum of atom numbers of nickel (Ni), cobalt (Co), manganese (Mn), and aluminum (Al) in the cobalt-rich layer and a ratio of the number of cobalt (Co) atoms to a sum of atom numbers of nickel (Ni), cobalt (Co), manganese (Mn), and aluminum (Al) in the lithium complex transition metal oxide is 0.05-0.2.

4 . The positive electrode active material of claim 1 , wherein boron (B) included in the lithium boron oxide is in an amount of 100-1,000 ppm with respect to the total weight of the positive electrode active material.

5 . The positive electrode active material of claim 1 , wherein the surface coating portion has a thickness of 10-100 nm.

6 . The positive electrode active material of claim 1 , wherein a content of the lithium by-products with respect to a total weight of the positive electrode active material is 0.55 wt % or less.

7 . The positive electrode active material of claim 1 , wherein the lithium complex transition metal oxide is represented by Formula 1 below:

wherein, M a is at least one selected from the group consisting of Mn and Al, M b is at least one selected from the group consisting of Zr, W, Mg, Al, Ce, Hf, Ta, La, Ti, Sr, Ba, Ge, V, Si, Nb, Mo, and Cr, M c is at least one selected from the group consisting of Al, Zr, Ti, Mg, Ta, Nb, Mo, and Cr, A is at least one selected from the group consisting of P and F, 0.9≤p≤1.05, 0<x 1 ≤0.3, 0<y 1 ≤0.2, 0≤z 1 ≤0.1, 0≤q 1 ≤0.1, 0≤a<1, and 0<x 1 +y 1 +z 1 ≤0.4.

8 . A positive electrode for a secondary battery, the positive electrode comprising the positive electrode active material according to claim 1 .

9 . A lithium secondary battery comprising the positive electrode according to claim 8 .

Assignees

• Lg Chemical Ltd

Inventors

• Chae Hwa Seok
• Park Sang Min
• Park Sin Young
• Park Hong Kyu
• Kang Seong Hoon

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

• H01M4/505

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

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/366

  as layered products · CPC title