Cathode active material for lithium secondary battery and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-12597598-B2
Application number	US-202418757500-A
Country	US
Kind code	B2
Filing date	Jun 28, 2024
Priority date	Jun 26, 2018
Publication date	Apr 7, 2026
Grant date	Apr 7, 2026

Abstract

A cathode active material for a lithium secondary battery includes a lithium-aluminum-titanium oxide formed on a surface of a lithium metal oxide particle having a specific formula. The cathode active material may have an improved structural stability even in a high temperature condition.

First claim

What is claimed is:

1 . A cathode active material for a lithium secondary battery, comprising:
core portion comprising (i) a lithium metal oxide particle containing Ni, and (ii) a boron-including oxide, the lithium metal oxide particle comprising concave and convex portions formed on the on the surfaces thereof, the boron-including oxide at least partially filling the concave and convex portions; and coating layer comprising an aluminum-zirconium oxide and the boron-including oxide, wherein the coating layer is formed on at least a part of a surface of core portion, wherein the molar fraction of Ni based on total moles of metals excluding lithium in the lithium metal oxide particle is in a range from 0.7 to 0.95.

2 . The cathode active material for a lithium secondary battery according to claim 1 , further comprising a lithium-aluminum-titanium oxide formed on at least a part of the surface of the lithium metal oxide particle.

3 . The cathode active material for a lithium secondary battery according to claim 2 , wherein the lithium-aluminum-titanium oxide is represented by Formula 2 below:
Li γ Al v Ti w O x   [Formula 2]
wherein, in the above Formula 2, γ, v, w and x are in a range of 0.8<γ≤1.2, 0<v≤1, 0<w≤1, 0.98≤v+w≤1.02, and 1.5≤x≤4, respectively.

4 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium metal oxide particle is formed of a crystal of a compound represented by Formula 1 below:
Li α Ni y M z O 2-β   [Formula 1]
wherein, in the above Formula 1, M is at least one element selected from the group consisting of Co, Mn, Ti, Zr, Al and B, and α, β, y, and z are in a range of 0.7≤α≤1.1, −0.1≤β≤0.5, 0.7≤y≤0.95, and 0.95<y+z≤1.1, respectively.

5 . The cathode active material for a lithium secondary battery according to claim 4 , wherein, in the above Formula 1, M z is Co a Mn b M′ c , M′ is at least one element selected from the group consisting of Ti, Zr, Al and B, and a, b, c, and y are in a range of 0.05≤a≤0.2, 0.03≤b≤0.2, and 0.95<y+a+b+c≤1.1, respectively.

6 . The cathode active material for a lithium secondary battery according to claim 1 , further comprising at least one of Al 2 O 3 and LiAlO 2 formed on the surface of the lithium metal oxide particle.

7 . The cathode active material for a lithium secondary battery according to claim 1 , further comprising LiTiO 2 formed on the surface of the lithium metal oxide particle.

8 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the boron-including oxide is present as an integral coating together with the aluminum-zirconium oxide.

9 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the boron-including oxide includes at least one selected from the group consisting of B 4 O 10 , AlBO 3 and Li 2 B 4 O 7 .

Assignees

• Sk On Co Ltd

Inventors

• Noh Mi Jung
• Kim Jik Soo
• Kim Sang Bok
• Choi Ji Hoon
• Han Kook Hyun

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

• H01M4/525

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

• 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

• C01P2006/40

  Electric properties · CPC title