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

Patent metadata

Field	Value
Publication number	US-12463206-B2
Application number	US-202217864956-A
Country	US
Kind code	B2
Filing date	Jul 14, 2022
Priority date	Nov 26, 2018
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A cathode active material for a lithium secondary battery includes a lithium metal oxide particle, and an organic poly-phosphate or an organic poly-phosphonate formed on at least portion of a surface of the lithium metal oxide particle. Chemical stability of the lithium metal oxide particle may be improved and surface residues may be reduced by the organic poly-phosphate or the organic poly-phosphonate.

First claim

What is claimed is:

1 . A cathode active material for a lithium secondary battery, comprising:
a lithium metal oxide particle represented by General Formula 1; a metal oxide coating layer containing at least one selected from a group consisting of Al 2 O 3 , ZrO 2 and TiO 2 on at least a portion of the lithium metal oxide particle; and an organic poly-phosphate forming a coating layer on at least a portion of the lithium metal oxide coating layer or an organic poly-phosphonate forming a coating layer on at least a portion of the metal oxide coating layer; wherein the coating layer including the organic poly-phosphate or the organic poly-phosphonate is coupled to the lithium metal oxide particle by an organic ligand bond or an organic metal complex bond, wherein, an ion fragment peak of PO + is detected by a Time of Flight Secondary Ion Mass Spectrometry (TOF-SIMS) analysis of a surface of the cathode active material, wherein the organic poly-phosphate is derived from an organic poly-phosphate compound represented by Structural Formula 1 below or an organic poly-phosphate salt thereof, and the organic poly-phosphonate is derived from an organic poly-phosphonate compound represented by Structural Formula 2 below or an organic poly-phosphonate salt thereof:
Li x Ni y M 1-y O 2   [General Formula 1]

wherein, in the General Formula 1 above, 0.95≤x≤1.08, 0.5≤y≤1, and M is at least one element selected from a group consisting of Co and Mn,

wherein, in the Structural Formulae 1 and 2 above, m is an integer from 2 to 20, R 1 represents a C 1 -C 10 hydrocarbon group substituted with a substituent group or an unsubstituted C 1 -C 10 hydrocarbon group, and the substituent group includes halogen, a cyano group, a hydroxyl group, a phosphoric acid group, a carboxylic group or a salt thereof, or
wherein, in the Structural Formulae 1 and 2 above, m is an integer from 2 to 20, R 1 represents a C 1 -C 10 hydrocarbon group substituted with a substituent group, wherein the substituent group includes at least one selected from a group consisting of a carbon-carbon double bond, —O—, —S—, —CO—, —OCO—, —SO—, —CO—O—, —O—CO—O—, —S—CO—, —S—CO—O—, —CO—NH—, —NH—CO—O—, —NR′—,

—S—S— and —SO 2 —, and R′ is hydrogen or a C 1 -C 8 alkyl group.

2 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the organic poly-phosphate compound or the organic poly-phosphonate compound includes at least one of compounds represented by Chemical Formulae 1 to 3 below:

3 . The cathode active material for a lithium secondary battery according to claim 1 , wherein the organic poly-phosphate salt or the organic poly-phosphonate salt includes a compound represented by Chemical Formula 4 below:

wherein, in the Chemical Formula 4 above, n is an integer from 2 to 10.

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

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

6 . The cathode active material for a lithium secondary battery according to claim 5 , wherein the lithium metal oxide particle includes a doping containing at least one selected from a group consisting of Al, Zr and Ti as an element.

Assignees

• Sk On Co Ltd

Inventors

• Kim Sang Bok
• Kim Jik Soo
• Kwak Hyo Shin
• Kim Myoung Lae

Classifications

• H01M4/505

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

• H01M2004/021

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

• H01M4/628

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title