Non-aqueous electrolyte solution for lithium secondary battery, and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-12500269-B2
Application number	US-202218080111-A
Country	US
Kind code	B2
Filing date	Dec 13, 2022
Priority date	Dec 15, 2021
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

The present disclosure provides a non-aqueous electrolyte solution for a lithium secondary battery, and a lithium secondary battery including the non-aqueous electrolyte solution. Specifically, the non-aqueous electrolyte solution for a lithium secondary battery may include a lithium salt, a non-aqueous organic solvent, a first additive comprising a compound represented by Formula 1, at least one second additive selected from the group consisting of vinylethylene carbonate (VEC) and ethyl di(pro-2-yn-1-yl) phosphate (EDP), and at least one third additive selected from the group consisting of a cyclic carbonate compound and a compound represented by Formula 2.

First claim

The invention claimed is:

1 . A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
a lithium salt; a non-aqueous organic solvent; a first additive comprising a compound represented by Formula 1; a second additive comprising vinylethylene carbonate (VEC), ethyl di(pro-2-yn-1-yl) phosphate (EDP), or a combination thereof; and a third additive including a cyclic carbonate compound except for vinylethylene carbonate (VEC), a compound represented by Formula 2, or a combination thereof:

wherein in Formula 1,
R is a substituted or unsubstituted alkylene group having 1 to 3 carbon atoms, and
R 1 to R 3 are each independently hydrogen, an alkyl group having 1 to 3 carbon atoms, or —CN, and

wherein in Formula 2,
n is an integer of 1 or 2,
provided that the non-aqueous electrolyte solution does not comprise propyl propionate.

2 . The non-aqueous electrolyte solution of claim 1 , wherein:
R is a substituted or unsubstituted alkylene group having 1 carbon atom or 2 carbon atoms; and R 1 to R 3 are each independently hydrogen or an alkyl group having 1 carbon atom or 2 carbon atoms.

3 . The non-aqueous electrolyte solution of claim 1 , wherein the compound represented by Formula 1 is a compound represented by Formula 1a:

4 . The non-aqueous electrolyte solution of claim 1 , wherein the first additive is included in an amount of 0.05 wt % to 5 wt % based on the total weight of the non-aqueous electrolyte solution.

5 . The non-aqueous electrolyte solution of claim 1 , wherein the first additive and the second additive are included in a weight ratio of 1:0.5 to 1:60.

6 . The non-aqueous electrolyte solution of claim 1 , wherein the first additive and the second additive are included in a weight ratio of 1:0.5 to 1:30.

7 . The non-aqueous electrolyte solution of claim 1 , wherein the first additive and the second additive are included in a weight ratio of 1:0.5 to 1:15.

8 . The non-aqueous electrolyte solution of claim 1 , wherein the second additive is ethyl di(pro-2-yn-1-yl) phosphate (EDP).

9 . The non-aqueous electrolyte solution of claim 1 , wherein the cyclic carbonate compound is vinylene carbonate (VC).

10 . The non-aqueous electrolyte solution of claim 1 , wherein the compound represented by Formula 2 is 1,3-propane sultone (PS) or 1,4-butane sultone.

11 . The non-aqueous electrolyte solution of claim 1 , wherein the third additive is a mixture including vinylene carbonate (VC) and the compound represented by Formula 2.

12 . The non-aqueous electrolyte solution of claim 1 , further comprising at least one fourth additive of a halogen-substituted carbonate-based compound, a sulfate-based compound, a phosphate-based or phosphite-based compound, a borate-based compound, a benzene-based compound, an amine-based compound, a silane-based compound, or a lithium salt-based compound.

13 . A lithium secondary battery comprising a negative electrode, a positive electrode, a separator interposed between the negative electrode and the positive electrode, and a non-aqueous electrolyte solution for a lithium secondary battery,
wherein the non-aqueous electrolyte solution includes: a lithium salt; a non-aqueous organic solvent; a first additive comprising a compound represented by Formula 1; a second additive comprising vinylethylene carbonate (VEC), ethyl di(pro-2-yn-1-yl) phosphate (EDP), or a combination thereof; and a third additive including a cyclic carbonate compound except for vinylethylene carbonate (VEC), a compound represented by Formula 2, or a combination thereof:

wherein in Formula 1,
R is a substituted or unsubstituted alkylene group having 1 to 3 carbon atoms, and
R 1 to R 3 are each independently hydrogen, an alkyl group having 1 to 3 carbon atoms, or —CN, and

wherein in Formula 2,
n is an integer of 1 or 2,
provided that the non-aqueous electrolyte solution does not comprise propyl propionate.

14 . The lithium secondary battery of claim 13 , wherein the positive electrode comprises a positive electrode active material made of a lithium transition metal oxide containing one or more metals selected from cobalt, manganese, nickel, or aluminum and lithium.

15 . The lithium secondary battery of claim 13 , wherein the first additive and the second additive are included in a weight ratio of 1:0.5 to 1:60.

Assignees

• Lg Energy Solution Ltd

Inventors

• Oh Jeong Woo
• Lee Chul Haeng
• An Yu Ha
• Park Sung Guk

Classifications

• 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

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M4/505

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

• 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