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

Patent metadata

Field	Value
Publication number	US-12100829-B2
Application number	US-202217831580-A
Country	US
Kind code	B2
Filing date	Jun 3, 2022
Priority date	Oct 26, 2017
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A method of preparing a positive electrode active material for a secondary battery includes preparing a precursor of a composite transition metal oxide compound represented by Formula 1, and mixing the precursor, a lithium source, and a doping element source and sintering the mixture to form a doped lithium composite transition metal oxide, wherein the doping element source is a hydroxide-based compound.Ni1−(x1+y1)Cox1May1(OH)2  [Formula 1]wherein, Ma is at least one element selected from the group consisting of manganese (Mn) and aluminum (Al), and 0<x1≤0.4, 0<y≤0.4, and 0<x1+y≤0.4. The positive electrode active material satisfies a weight loss ratio at 600° C. of 1.0% or less and a weight loss ratio at 900° C. of 2.0% or less during thermogravimetric analysis (TGA).

First claim

The invention claimed is:

1. A method of preparing a positive electrode active material for a secondary battery, comprising:
preparing a precursor of a composite transition metal oxide compound represented by Formula 1; and
mixing the precursor, a lithium source, and a doping element source to obtain a mixture,
sintering the mixture to form a doped lithium composite transition metal oxide,
washing the doped lithium composite transition metal oxide, and
secondarily sintering the doped lithium composite transition metal oxide directly after the washing of the doped lithium composite transition metal oxide, to produce the positive electrode active material,
wherein the doping element source is a hydroxide-based compound:
Ni 1−(x1+y1) Co x1 M a y 1(OH) 2   [Formula 1]

wherein, M a is at least one element selected from the group consisting of manganese (Mn) and aluminum (Al), and 0<x1≤0.4, 0<y1≤0.4, and 0<x1+y1≤0.4.

2. The method of claim 1 , wherein the doping element source comprises at least one selected from the group consisting of Zr(OH) 4 , Mg(OH) 2 , Al(OH) 3 , Co(OH) 2 , Ti(OH) 4 , and Ba(OH) 2 .

3. The method of claim 1 , wherein the doping element source is Zr(OH) 4 .

4. The method of claim 1 , wherein the doping element source is added in an amount of 40 parts by mol to 60 parts by mol based on 100 parts by mol of a total amount of an oxide-based compound added when the oxide-based compound is added as the doping element source.

5. The method of claim 1 , wherein the doped lithium composite transition metal oxide contains nickel (Ni) among total transition metals in an amount of 60 mol % or more.

6. The method of claim 1 , wherein a sintering temperature during the sintering is in a range of 600° C. to 800° C.

7. The method of claim 1 , wherein a sintering temperature during the secondary sintering is in a range of 300° C. to 700° C.

Assignees

• Lg Chemical Ltd

Inventors

• Park Na Ri
• Park Sung Soon

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 Primary

  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

• C01P2006/40

  Electric properties · CPC title