Electrolyte solution additive for secondary battery, and non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery which include the same

Patent metadata

Field	Value
Publication number	US-12308388-B2
Application number	US-202117771911-A
Country	US
Kind code	B2
Filing date	Mar 23, 2021
Priority date	Mar 26, 2020
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

An electrolyte solution additive, an electrolyte solution including the same, and a lithium secondary battery including the same are disclosed herein. In some embodiments, an electrolyte solution additive includes a compound represented by Formula 1:

Wherein X is oxygen (O) or sulfur (S), and R is a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms or N(R 1 ) 2 , wherein R 1 is hydrogen or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms. The additive has an excellent effect of scavenging a decomposition product generated from a lithium salt and simultaneously forming a robust film on a surface of a positive electrode.

First claim

The invention claimed is:

1. A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising an electrolyte solution additive comprising a compound represented by Formula 1:

wherein, in Formula 1,
X is oxygen (O) or sulfur(S), and
R is a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms or N (R 1 ) 2 , wherein R 1 is hydrogen or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms.

2. The non-aqueous electrolyte solution of claim 1 , wherein, in Formula 1, X is S, and R is a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms or N (R 1 ) 2 , wherein R 1 is hydrogen or a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms.

3. The non-aqueous electrolyte solution of claim 1 , wherein, in Formula 1, X is S, and R is N (R 1 ) 2 , wherein R 1 is hydrogen or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms.

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

5. The non-aqueous electrolyte solution of claim 1 , wherein the electrolyte solution additive is included in an amount of 0.05 wt % to 3 wt % based on a total weight of the non-aqueous electrolyte solution.

6. The non-aqueous electrolyte solution of claim 5 , wherein the electrolyte solution additive is present in an amount of 0.1 wt % to 3 wt % based on the total weight of the non-aqueous electrolyte solution.

7. The non-aqueous electrolyte solution of claim 1 , further comprising a lithium salt and an organic solvent.

8. The non-aqueous electrolyte solution of claim 1 , further comprising at least one second additive selected 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.

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

Assignees

• Lg Energy Solution Ltd

Inventors

• Oh Jeong Woo
• Kang Yoo Sun
• Lee Chul Haeng

Classifications

• H01M2300/0028

  characterised by the solvent · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0525

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

• C07D285/12

  1,3,4-Thiadiazoles; Hydrogenated 1,3,4-thiadiazoles · CPC title

• H01M10/052

  Li-accumulators · CPC title