Non-aqueous electrolyte for lithium secondary battery, and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-12531272-B2
Application number	US-202118005783-A
Country	US
Kind code	B2
Filing date	Oct 14, 2021
Priority date	Nov 3, 2020
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

The present invention provides a non-aqueous electrolyte solution for a lithium secondary battery comprising a lithium salt, an organic solvent and an additive, wherein the additive includes an anion having a sulfone imide group and a propane sultone group or an ethylene sulfate group.

First claim

The invention claimed is:

1 . A non-aqueous electrolyte solution for a lithium secondary battery, comprising an electrolyte salt, an organic solvent and an additive,
wherein the additive is a lithium salt containing an anion having (1) a sulfone imide group; and (2) a propane sultone group or an ethylene sulfate group.

2 . The non-aqueous electrolyte solution for the lithium secondary battery according to claim 1 , wherein the additive is represented by Chemical Formula 1:

wherein,
X is CH 2 or O, and
R is hydrogen, fluorine, or an alkyl group having 1 to 4 carbon atoms substituted with a fluorine.

3 . The non-aqueous electrolyte solution for the lithium secondary battery according to claim 2 , wherein R is F or CF 3 .

4 . The non-aqueous electrolyte solution for the lithium secondary battery according to claim 2 , wherein the additive is represented by any one of Chemical Formula A to Chemical Formula D:

5 . The non-aqueous electrolyte solution for the lithium secondary battery according to claim 1 , wherein the additive is contained in an amount of 0.01 wt. % to 10 wt. % based on the total weight of the non-aqueous electrolyte solution.

6 . The non-aqueous electrolyte solution for the lithium secondary battery according to claim 1 , wherein the electrolyte salt is selected from the group consisting 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 , LiFSI(Lithium bis(fluorosulfonyl)imide, LiN(SO 2 F) 2 ), LiBETI(lithium bis(perfluoroethanesulfonyl)imide, LiN(SO 2 CF 2 CF 3 ) 2 ) and LiTFSI(lithium bis(trifluoromethanesulfonyl)imide, LiN(SO 2 CF 3 ) 2 ).

7 . The non-aqueous electrolyte solution for the lithium secondary battery according to claim 1 , wherein the electrolyte salt has a concentration of 0.1M to 3M.

8 . The non-aqueous electrolyte solution for the lithium secondary battery according to claim 1 , wherein the organic solvent comprises at least one of ethers, esters, amides, linear carbonates, or cyclic carbonates.

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

10 . The lithium secondary battery according to claim 9 , which has an operating voltage of 4.0V or higher.

Assignees

• Lg Energy Solution Ltd

Inventors

• Yeom Chuleun
• Lee Jungmin
• Lee Chul Haeng

Classifications

• H01M2300/0028

  characterised by the solvent · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title