Cathode active material for lithium secondary battery and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-12525605-B2
Application number	US-202217572513-A
Country	US
Kind code	B2
Filing date	Jan 10, 2022
Priority date	Feb 16, 2021
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A cathode active material for a lithium secondary battery according to exemplary embodiments of the present invention includes a lithium metal oxide particle core part and an organic compound coating layer which includes a functional group containing a sulfur atom. The cathode active material may suppress side reactions with an electrolyte while maintaining the stability of the layered structure of the lithium metal oxide particles, suppress a gelation phenomenon of the slurry during manufacturing a cathode, and maintain the high energy, high output and long life-span characteristics of the lithium secondary battery.

First claim

What is claimed is:

1 . A cathode active material for a lithium secondary battery comprising:
a lithium metal oxide particle core part; and an organic compound coating layer including an organic compound which includes a functional group containing a sulfur atom, wherein the organic compound is directly formed on a surface of the lithium metal oxide particle core part, wherein the organic compound is a disulfide compound represented by Structural Formula 1 or Structural Formula 2, or a compound represented by Chemical Formula 4 below:

wherein, in Structural Formula 1, R 1 to R 4 are each independently hydrogen; an alkyl group having 1 to 10 carbon atoms; an alkyl group having 1 to 10 carbon atoms in which at least one hydrogen is substituted with a hydroxyl group; an alkoxy group having 1 to 10 carbon atoms; a hydroxyl group; an amine group in which at least one hydrogen is unsubstituted or substituted with an alkyl group having 1 to 10 carbon atoms; a mercapto group; or a carboxyl group,

wherein, in Structural Formula 2, R 5 and R 6 are each independently oxygen, and
R 7 and R 8 are each independently hydrogen; an alkyl group having 1 to 10 carbon atoms; an alkyl group having 1 to 10 carbon atoms in which at least one hydrogen is substituted with a hydroxyl group; an alkoxy group having 1 to 10 carbon atoms; a hydroxyl group; an amine group in which at least one hydrogen is unsubstituted or substituted with an alkyl group having 1 to 10 carbon atoms; a mercapto group; or a carboxyl group,

wherein a weight ratio of the lithium metal oxide particles to the organic compound is 99.9:0.1 to 90:10.

2 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the organic compound is at least one selected from the group consisting of compounds of Chemical Formulae 1 and 2 below:

3 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium metal oxide particles include a lithium nickel-based metal oxide represented by General Formula 1 below:
Li x Ni y M y-1 O 2   [General Formula 1]
wherein, in General Formula 1, x and y are in a range of 0.95<x<1.08, and y≥0.5, respectively, and M is at least one element selected from the group consisting of Co, Mn, Al, Zr, Ti, B, Mg and Ba.

4 . The cathode active material for a lithium secondary battery according to claim 3 , wherein, in General Formula 1, y is in a range of 0.8≤y≤0.93.

5 . The cathode active material for a lithium secondary battery according to claim 3 , wherein in General Formula 1, M includes Co and Mn.

6 . The cathode active material for a lithium secondary battery according to claim 3 , wherein the lithium metal oxide particles include a doping or coating including at least one of Al, Zr and Ti.

7 . A lithium secondary battery comprising:
a cathode comprising the cathode active material for a lithium secondary battery according to claim 1 ; an anode; and a separation membrane disposed between the cathode and the anode.

Assignees

• Sk Innovation Co Ltd
• Sk On Co Ltd

Inventors

• Choi Jae Ho
• Kim Jik Soo
• 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

• H01M4/602

  Polymers · 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

• H01M4/505 Primary

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