# US 12,183,888 B2 · Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

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- Number: US 12,183,888 B2
- Document ID: US12183888B2
- Status: Granted
- Kind: B2
- Application number: 17/440,436
- Filed: 2020-03-20
- Published: 2022-05-26
- Granted: 2024-12-31
- Earliest claimed: 2019-03-21
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Jung Min Lee; Young Min Lim; Chul Haeng Lee
- Web page: https://patentgrep.com/patent/US12183888B2

## CPC

- H01M 10/0569: characterised by the solvents
- C07F 5/04: Esters of boric acids
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0567: characterised by the additives
- H01M 2300/0034: Fluorinated solvents
- H01M 2300/0037: Mixture of solvents
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## 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, a fluorine-based linear ether solvent, a fluorine-based cyclic carbonate solvent, and a fluorine-based lithium compound, wherein the fluorine-based linear ether solvent and the fluorine-based cyclic carbonate solvent are present in a weight ratio of 6:4 to 9:1. In some embodiments, a lithium secondary battery having the non-aqueous electrolyte solvent has improved high-temperature storage characteristics.

## Claims

### Claim 1

A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
a lithium salt;
a fluorine-based linear ether solvent represented by Formula 1;
a fluorine-based cyclic carbonate solvent; and
a fluorine-based lithium compound represented by Formula 2a,
wherein the fluorine-based linear ether solvent and the fluorine-based cyclic carbonate solvent are present in a weight ratio of 6:4 to 9:1,
R1—O—R2 [Formula 1]
wherein, in Formula 1,
R1 and R2 are each independently an alkyl group having 1 to 10 carbon atoms which is unsubstituted or substituted with fluorine, wherein at least one of R1 and R2 is an alkyl group having 1 to 10 carbon atoms which is substituted with fluorine,

### Claim 2 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein, in Formula 1, R1 and R2 are each independently an alkyl group having 2 to 8 carbon atoms which is unsubstituted or substituted with fluorine, wherein at least one of R1 and R2 is an alkyl group having 2 to 8 carbon atoms which is substituted with fluorine.

### Claim 3 (depends on 2)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 2, wherein, in Formula 1, R1 and R2 are each independently an alkyl group having 2 to 5 carbon atoms which is unsubstituted or substituted with fluorine, wherein at least one of R1 and R2 is an alkyl group having 2 to 5 carbon atoms which is substituted with fluorine.

### Claim 4 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the fluorine-based linear ether solvent comprises at least one 1,1,2,2-tetrafluoroethyl 2,2,2-trifluoroethyl ether, 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether, or 1H, 1H, 5H-octafluoropentyl 1,1,2,2-tetrafluoroethyl ether.

### Claim 5 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the fluorine-based linear ether solvent comprises 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether.

### Claim 6 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the fluorine-based cyclic carbonate solvent comprises fluoroethylene carbonate or difluoroethylene carbonate.

### Claim 7 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the fluorine-based cyclic carbonate solvent comprises fluoroethylene carbonate.

### Claim 8 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the fluorine-based linear ether solvent and the fluorine-based cyclic carbonate solvent are present in a weight ratio of 7:3 to 9:1.

### Claim 9 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the fluorine-based lithium compound is present in an amount of 0.05 wt % to 3.0 wt % based on a total weight of the non-aqueous electrolyte solution.

### Claim 10 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, further comprising at least one fluorine-based solvent of a fluorine-based linear carbonate solvent, a fluorine-based dioxolane solvent, a fluorine-based phosphite solvent, a fluorine-based phosphate solvent, a fluorine-based benzene solvent, a fluorine-based cyclic ether solvent, a fluorine-based propionate solvent, or a fluorine-based acetate solvent.

### Claim 11 (depends on 10)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 10, wherein a weight ratio of a mixed solvent of the fluorine-based linear ether solvent and the fluorine-based cyclic carbonate solvent to the fluorine-based solvent is in a range of 1:0.7 to 1:1.

### Claim 12 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, further comprising at least one fluorinated compound of a fluorinated nitrile-based compound, a fluorinated lithiated phosphate-based compound, or a fluorinated lithiated borate-based compound.

### Claim 13 (depends on 1)

A lithium secondary battery comprising the non-aqueous electrolyte solution of claim 1.