# US 12,119,448 B2 · Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

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- Number: US 12,119,448 B2
- Document ID: US12119448B2
- Status: Granted
- Kind: B2
- Application number: 17/423,163
- Filed: 2020-01-16
- Published: 2022-04-28
- Granted: 2024-10-15
- Earliest claimed: 2019-01-17
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Shul Kee Kim; Young Min Lim; Ha Eun Kim
- Web page: https://patentgrep.com/patent/US12119448B2

## CPC

- H01M 10/0567: characterised by the additives
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 2300/0025: Organic electrolyte
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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, and particularly, to a non-aqueous electrolyte solution includes a lithium salt, an organic solvent, a first additive, and a second additive, wherein the first additive is a compound represented by Formula 1 and the second additive is a compound represented by Formula 2.

## Claims

### Claim 1

A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
a lithium salt;
an organic solvent;
a first additive; and
a second additive,
wherein the first additive is a compound represented by Formula 1, and the second additive is a compound represented by Formula 2:
wherein, in Formula 1,
R1 and R2 are each independently a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms, and R3 is hydrogen or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms,
wherein, in Formula 2,
A and A′ are each independently oxygen (O), sulfur(S), or nitrogen (N),
R4 is a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms, and R5 to R7 are each independently hydrogen or an alkyl group having 1 to 4 carbon atoms,
wherein the organic solvent does not comprise propyl propionate.

### 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 unsubstituted alkylene group having 1 to 4 carbon atoms, and R3 is hydrogen or an alkyl group having 1 to 3 carbon atoms.

### Claim 3 (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 unsubstituted alkylene group having 1 to 3 carbon atoms, and R3 is hydrogen.

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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 0.01 wt % to 5 wt % based on a total weight of the non-aqueous electrolyte solution.

### Claim 6 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein, in Formula 2, A and A′ are N, R4 is a substituted or unsubstituted alkylene group having 1 to 3 carbon atoms, and R5 to R7 are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms.

### Claim 7 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the second additive comprises at least one represented by Formulae 2a or 2b:

### Claim 8 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the first additive and the second additive are present in a weight ratio of 1:0.01 to 1:10.

### Claim 9 (depends on 1)

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

### Claim 10 (depends on 1)

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