Positive Electrode for Lithium Secondary Battery Including Positive Electrode Additive

Patent metadata

Field	Value
Publication number	US-2025372659-A1
Application number	US-202519198694-A
Country	US
Kind code	A1
Filing date	May 5, 2025
Priority date	May 28, 2024
Publication date	Dec 4, 2025
Grant date	—

Abstract

A positive electrode of a secondary battery includes: a positive electrode active material layer, which in turn includes a positive electrode active material, a conductive material, a binder, and a positive electrode additive. The positive electrode additive includes substituents with a cyclic sulfonic ester (sultone) or cyclic sulfate structure, so that the oxygen release from a positive electrode active material is suppressed, which improves the structural stability of the positive electrode active material.

First claim

What is claimed is:

1 . A positive electrode comprising:
a positive electrode active material layer, wherein the positive electrode active material layer includes a positive electrode active material, a conductive material, a binder, and a positive electrode additive, and the positive electrode additive includes at least one of a compound of Formula 1 and a compound of Formula 2:

wherein,
X 1 and X 2 are each independently *—O—* or *—C(R X1 )(R X2 )—*,
R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R X1 , and R X2 are each independently any one selected from H, F, and an alkyl group with carbon numbers 1 to 5,
L is any one selected from a direct bond, a bivalent organic group represented by Formula 1-1, and a bivalent organic group represented by Formula 1-2,
m and n are each independently 1 or 2, and
* is a bonding site

wherein,
L 11 and L 12 are each independently a direct bond, or an alkylene group with carbon numbers 1 to 5, which is capable of being substituted with one or more fluorines, or an alkylene group with carbon numbers 1 to 3, which is capable of being substituted with one or more fluorines,
p is 1 or 2, and
* is a bonding site,

wherein,
L 21 and L 22 are each independently a direct bond, or an alkylene group with carbon numbers 1 to 5, which is capable of being substituted with one or more fluorines, and
* is a bonding site,

wherein,
X 3 and X 4 are each independently *—O—* or *—C(R X3 )(R X4 )—*,
R 21 , R 22 , R 23 , R 24 , R 25 , R 26 , R 27 , R 28 , R X3 , and R X4 are each independently any one selected from H, F, and an alkyl group with carbon numbers 1 to 5, and
* is a binding site.

2 . The positive electrode according to claim 1 , wherein in Formula 1, L is any one selected from bivalent organic groups of Formula 1-1a, Formula 1-1b, Formula 1-1c, and Formula 1-1d:

3 . The positive electrode according to claim 1 , wherein in Formula 1, L is any one selected from bivalent organic groups of Formula 1-2a, Formula 1-2b, and Formula 1-2c:

4 . The positive electrode according to claim 1 , wherein in Formula 1, m and n are each 1.

5 . The positive electrode according to claim 1 , wherein in Formula 1-1, p is 2.

6 . The positive electrode according to claim 1 , wherein in Formula 2, X 3 and X 4 are each *—O—*.

7 . The positive electrode according to claim 1 , wherein in Formula 2, R 21 , R 22 , R 23 , R 24 , R 25 , R 26 , R 27 , and R 28 are each H.

8 . The positive electrode according to claim 1 , wherein the positive electrode additive is included in a content of about 0.001 wt % to 10 wt % based on a total weight of the positive electrode active material layer.

9 . The positive electrode according to claim 1 , wherein the positive electrode active material includes a lithium transition metal oxide represented by Formula 3:

wherein,
M 1 is Al, Mn, or a combination thereof,
M 2 is at least one element selected from Zr, Ti, Mg, Ta, Nb, W, Mo, and Cr, and 1.0≤a≤1.3, 0<x<0.4, 0<y<0.4, 0≤z≤0.1, 0.6≤1-x-y<1.0

10 . A lithium secondary battery comprising:
the positive electrode according to claim 1 ; a negative electrode; and an electrolyte.

11 . The lithium secondary battery according to claim 10 , wherein the electrolyte includes a lithium salt, an organic solvent, and an electrolyte additive.

12 . The lithium secondary battery according to claim 11 , wherein the electrolyte additive is at least one selected from vinylene carbonate (VC), vinyl ethylene carbonate (VEC), fluoro ethylene carbonate (FEC), propane sultone (PS), propene sultone (PRS), ethylene sulfate (Esa), LiBF 4 , lithium difluoro phosphate (LiDFP), lithium difluoro oxalato borate (LiODFB), lithium bis(oxalato) borate (LiBOB), lithium difluoro oxalato phosphate (LiDFOP), and propargyl-1H-imidazole-1-carboxylate.

13 . The lithium secondary battery according to claim 11 , wherein the organic solvent includes at least one organic solvent selected from a cyclic carbonate-based organic solvent, a linear carbonate-based organic solvent, a linear ester-based organic solvent, and a cyclic ester-based organic solvent.

14 . The lithium secondary battery according to claim 10 , wherein the negative electrode includes a negative electrode active material layer including a negative electrode active material and formed on a negative electrode current collector, and
the negative electrode active material includes at least one of graphite and SiO x (0≤x<2).

15 . A method of manufacturing a positive electrode including:
a positive electrode active material layer including a positive electrode active material, a conductive material, a binder, and a positive electrode additive, the method comprising: including, in the positive electrode additive, at least one of a compound of Formula 1 and a compound of Formula 2:

wherein,
X 1 and X 2 are each independently *—O—* or *—C(R X1 )(R X2 )—*,
R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R X1 , and R X2 are each independently any one selected from H, F, and an alkyl group with carbon numbers 1 to 5,
L is any one selected from a direct bond, a bivalent organic group represented by Formula 1-1, and a bivalent organic group represented by Formula 1-2,
m and n are each independently 1 or 2, and
* is a bonding site,

wherein,
L 11 and L 12 are each independently a direct bond, or an alkylene group with carbon numbers 1 to 5, which is capable of being substituted with one or more fluorines, or an alkylene group with carbon numbers 1 to 3, which is capable of being substituted with one or more fluorines,
p is 1 or 2, and
* is a bonding site,

wherein,
L 21 and L 22 are each independently a direct bond, or an alkylene group with carbon numbers 1 to 5, which is capable of being substituted with one or more fluorines, and
* is a bonding site,

wherein,
X 3 and X 4 are each independently *—O—* or *—C(R X3 )(R X4 )—*,
R 21 , R 22 , R 23 , R 24 , R 25 , R 26 , R 27 , R 28 , R X3 , and R X4 are each independently any one selected from H, F, and an alkyl group with carbon numbers 1 to 5, and
* is a binding site.

16 . The method of manufacturing a positive electrode according to claim 15 ,

Assignees

• Lg Energy Solution Ltd

Inventors

• Yeom Chul Eun
• Lee Jung Min
• Ji Su Hyeon
• Ko Jin Hyuck
• Lee Chul Haeng

Classifications

• H01M10/0569

  characterised by the solvents · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/505

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

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0567

  characterised by the additives · CPC title