Non-Aqueous Electrolyte Solution for Lithium Secondary Battery and Lithium Secondary Battery Including the Same

Patent metadata

Field	Value
Publication number	US-2026074282-A1
Application number	US-202319106332-A
Country	US
Kind code	A1
Filing date	Aug 23, 2023
Priority date	Sep 2, 2022
Publication date	Mar 12, 2026
Grant date	—

Abstract

Provided are a non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same and having improved high-temperature storage characteristics and high-temperature cycle characteristics. Specifically, the non-aqueous electrolyte solution may comprise a lithium salt, an organic solvent and a compound represented by Formula 1 as a first additive:

wherein Formula 1,
Ar is a 5-membered or 6-membered nitrogen-containing ring,
and R 1 and R 2 are each independently an alkyl group having 1 to 8 carbon atoms.

First claim

1 . A non-aqueous electrolyte solution for a lithium secondary battery, comprising a lithium salt, an organic solvent and a first additive, wherein the first additive includes a compound represented by Formula 1:

wherein Formula 1,
Ar is a 5-membered or 6-membered nitrogen-containing ring, and
R 1 and R 2 are each independently an alkyl group having 1 to 8 carbon atoms.

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

wherein Formula 1A,
R 1 and R 2 are each independently an alkyl group having 1 to 8 carbon atoms.

3 . The non-aqueous electrolyte solution of claim 2 ,
wherein R 1 and R 2 are each independently an alkyl group having 1 to 5 carbon atoms.

4 . The non-aqueous electrolyte solution of claim 2 ,
wherein R 1 and R 2 are each independently an alkyl group having 1 to 3 carbon atoms.

5 . The non-aqueous electrolyte solution of claim 2 ,
wherein the compound is represented by Formula 1A-1 or Formula 1A-2:

6 . The non-aqueous electrolyte solution of claim 1 ,
wherein the compound is present in an amount of 0.5 wt % to 3.0 wt % based on a total weight of the non-aqueous electrolyte solution.

7 . The non-aqueous electrolyte solution of claim 6 ,
wherein the compound is present in an amount of 0.5 wt % to 2.5 wt % based on a total weight of the non-aqueous electrolyte solution.

8 . The non-aqueous electrolyte solution of claim 1 , further comprising at least one second additive selected from 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, a benzene-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 including a positive electrode active material; a negative electrode including a negative electrode active material; a separator disposed between the negative electrode and the positive electrode; and the non-aqueous electrolyte solution of claim 1 .

10 . The lithium secondary battery of claim 9 , wherein the positive electrode active material includes lithium and at least one metal selected from nickel, cobalt, manganese, iron, or aluminum.

11 . The non-aqueous electrolyte solution of claim 1 , wherein the lithium salt comprises at least one of LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiB 10 Cl 10 , LiAlCl 4 , LiAlO 4 , LiPF 6 , LiCF 3 SO 3 , LiCH 3 CO 2 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiCH 3 SO 3 , LiN(SO 2 F) 2 , LiN(SO 2 CF 2 CF 3 ) 2 or LiN(SO 2 CF 3 ) 2 .

12 . The non-aqueous electrolyte solution of claim 1 , wherein the organic solvent comprises at least one of a cyclic carbonate or a linear carbonate.

13 . The non-aqueous electrolyte solution of claim 1 , wherein the organic solvent comprises ethylene carbonate and ethyl methyl carbonate.

14 . The non-aqueous electrolyte solution of claim 1 , further comprising at least one second additive of vinylene carbonate or vinyl ethylene carbonate.

15 . The lithium secondary battery of claim 9 , wherein the positive electrode active material comprises a lithium composite transition metal oxide having a Ni content of 0.55 atm % or more.

16 . The lithium secondary battery of claim 9 , wherein the negative electrode active material comprises graphite and SiO.

Assignees

• Lg Energy Solution Ltd

Inventors

• Park Sung Guk
• Lee Chul Haeng
• Lee Jung Hoon

Classifications

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0568

  characterised by the solutes · CPC title