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

Patent metadata

Field	Value
Publication number	US-12107258-B2
Application number	US-202217960600-A
Country	US
Kind code	B2
Filing date	Oct 5, 2022
Priority date	Nov 26, 2018
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

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 method of preparing a cathode active material for a lithium secondary battery, comprising:
preparing a lithium metal oxide particle; and
cleaning the lithium metal oxide particle using a washing solution that includes an organic poly-phosphate compound or an organic poly-phosphonate compound,
wherein the cathode active material comprises the lithium metal oxide particle and a coating layer including the organic poly-phosphate compound or the organic poly-phosphonate compound,
wherein the organic poly-phosphate is represented by Structural Formula 1 below, and the organic poly-phosphonate is represented by Structural Formula 2 below:

wherein, in the Structural Formulae 1 and 2 above, m is an integer from 2 to 20, and R1 represents an unsubstituted C1-C10 hydrocarbon group or a C 1 -C 10 hydrocarbon group substituted with a substituent group, and the substituent group includes halogen, a cyano group, a hydroxyl group, a phosphoric acid group, a carboxylic group or a salt thereof.

2. The method according to claim 1 , wherein the lithium metal oxide particle includes a nickel-based lithium oxide represented by General Formula 1 below:
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, Mn, Al, Zr, Ti, B, Mg and Ba.

3. The method according to claim 1 , wherein an amount of the organic poly-phosphate compound or the organic poly-phosphonate compound is in a range from 0.1 weight percent to 2 weight percent based on a total weight of the lithium metal oxide particle.

4. The method according to claim 1 , wherein an amount of the organic poly-phosphate compound or the organic poly-phosphonate compound is in a range from 0.2 weight percent to 1 weight percent based on a total weight of the lithium metal oxide particle.

5. The method according to claim 1 , further comprising, before cleaning the lithium metal oxide particle, mixing and annealing the lithium metal oxide particle with at least one of Al 2 O 3 , ZrO 2 or TiO 2 .

6. A method of preparing a cathode active material for a lithium secondary battery, comprising:
preparing a lithium metal oxide particle; and
cleaning the lithium metal oxide particle using a washing solution that includes an organic poly-phosphate compound or an organic poly-phosphonate compound,
wherein the cathode active material comprises the lithium metal oxide particle and a coating layer including the organic poly-phosphate compound or the organic poly-phosphonate compound,
wherein the organic poly-phosphate is represented by Structural Formula 1 below, and the organic poly-phosphonate is represented by Structural Formula 2 below:

wherein, in the Structural Formulae 1 and 2 above, m is an integer from 2 to 20, and R1 represents a C 1 -C 10 hydrocarbon group substituted with a substituent group, and 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′—,

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

Assignees

• Sk Innovation Co Ltd
• 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

• H01M4/366 Primary

  as layered products · 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