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

Patent metadata

Field	Value
Publication number	US-12438192-B2
Application number	US-202017632047-A
Country	US
Kind code	B2
Filing date	Sep 9, 2020
Priority date	Sep 11, 2019
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte solution includes a lithium salt, an organic solvent, and a compound represented by Formula 1 as a first additive. A lithium secondary battery including the non-aqueous electrolyte has improved high-temperature storage characteristics.

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;
an organic solvent; and
a first additive,
wherein the first additive is a compound represented by Formula 1:

wherein, in Formula 1,
R 1 and R 3 are each independently a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms,
R 2 is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, and
R 4 and R 5 are each independently a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms.

2. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein, in Formula 1, R 1 and R 3 are each independently hydrogen or a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms,
R 2 is a substituted or unsubstituted alkylene group having 1 to 8 carbon atoms, and
R 4 and R 5 are each independently a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms.

3. The non-aqueous electrolyte solution for a lithium secondary battery of claim 2 , wherein, in Formula 1, R 1 , R 3 , R 4 , and R 5 are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, and
R 2 is a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms.

4. The non-aqueous electrolyte solution for a lithium secondary battery of claim 3 , wherein, in Formula 1, R 1 , R 3 , R 4 , and R 5 are each independently a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms, and
R 2 is a substituted or unsubstituted alkylene group having 1 to 4 carbon atoms.

5. The non-aqueous electrolyte solution for a lithium secondary battery of claim 4 , wherein, in Formula 1, R 1 , R 3 , R 4 , and R 5 are each independently a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms, and
R 2 is a substituted or unsubstituted alkylene group having 1 to 3 carbon atoms.

6. The non-aqueous electrolyte solution for a lithium secondary battery of claim 5 , wherein the compound represented by Formula 1 comprises a compound represented by Formula 1a:

7. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein the compound represented by Formula 1 is present in an amount of 0.1 wt % to 5 wt % based on a total weight of the non-aqueous electrolyte solution.

8. The non-aqueous electrolyte solution for a lithium secondary battery of claim 7 , wherein the compound represented by Formula 1 is present in an amount of 0.1 wt % to 3 wt % based on the total weight of the non-aqueous electrolyte solution.

9. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , further comprising at least one second additive of a cyclic carbonate-based compound, a halogen-substituted carbonate-based compound, a sultone-based compound, a sulfate-based compound, a phosphate-based compound, a borate-based compound, a nitrile-based compound, an amine-based compound, a silane-based compound, or a lithium salt-based compound.

10. A lithium secondary battery, comprising:
a negative electrode;
a positive electrode;
a separator disposed between the negative electrode and the positive electrode; and
the non-aqueous electrolyte solution of claim 1 .

11. The lithium secondary battery of claim 10 , wherein the positive electrode comprises:
a positive electrode active material including lithium and at least one metal selected of nickel (Ni), cobalt (Co), manganese (Mn), iron (Fe), or aluminum (Al).

Assignees

• Lg Energy Solution Ltd

Inventors

• An Yu Ha
• Kim Hyun Seung
• Lee Chul Haeng
• Oh Jeong Woo

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525 Primary

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