Positive electrode active material for secondary battery, and method of preparing the same

Patent metadata

Field	Value
Publication number	US-11189829-B2
Application number	US-202016849290-A
Country	US
Kind code	B2
Filing date	Apr 15, 2020
Priority date	Mar 3, 2016
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

The present disclosure relates to a positive electrode active material for a lithium secondary battery and a method of preparing the same, and more particularly, to a positive electrode active material for a lithium secondary battery comprising a lithium-nickel-based transition metal oxide; and a coating layer formed on the lithium-nickel-based transition metal oxide, the coating layer comprising a metal oxalate compound, and a method of preparing the same.

First claim

The invention claimed is:

1. A method of preparing a positive electrode active material for a lithium secondary battery comprising:
preparing a lithium-nickel-based transition metal oxide particle;
preparing an oxalic acid or a metal oxalate compound precursor;
preparing a boron precursor;
mixing the boron precursor and the lithium-nickel-based transition metal oxide particle to form a first mixture;
performing a first heat treatment of the first mixture to form a first coating layer comprising a boron compound on a surface of the lithium-nickel-based transition metal oxide particle;
mixing the lithium-nickel transition metal oxide particle having the first coating layer and the oxalic acid or the metal oxalate compound precursor to form a second mixture; and
performing a second heat treatment of the second mixture to form a second coating layer on the first coating layer.

2. The method of preparing a positive electrode for a lithium secondary battery of claim 1 , wherein the boron precursor comprises at least one selected from the group consisting of boric acid, boron oxide, lithium borate, magnesium borate, sodium borate, potassium borate, and calcium borate.

3. The method of preparing a positive electrode for a lithium secondary battery of claim 1 , wherein the boron precursor is comprised in an amount of 0.01 wt % to 10 wt % based on the total weight of the lithium-nickel-based transition metal oxide.

4. The method of preparing a positive electrode for a lithium secondary battery of claim 1 , wherein the oxalic acid or the metal oxalate compound precursor is comprised in an amount of 0.01 wt % to 5 wt % based on the total weight of the lithium-nickel-based transition metal oxide.

5. The method of preparing a positive electrode for a lithium secondary battery of claim 1 , wherein the oxalic acid or the metal oxalate compound precursor is in a liquid state or in a powder state.

Assignees

• Lg Chemical Ltd

Inventors

• Nho Jun Seok
• Cho Seung Beom
• Park Hyun Ah
• Ahn Jun Seong

Classifications

• H01M4/624

  Electric conductive fillers · CPC title

• H01M4/621

  Binders · 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

  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