# US 12,119,449 B2 · Non-aqueous electrolyte solution additive for lithium secondary battery, and non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery which include the same

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- Number: US 12,119,449 B2
- Document ID: US12119449B2
- Status: Granted
- Kind: B2
- Application number: 17/601,764
- Filed: 2020-04-16
- Published: 2022-06-30
- Granted: 2024-10-15
- Earliest claimed: 2019-04-18
- 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/US12119449B2

## CPC

- H01M 10/0567: characterised by the additives
- C07F 7/081: {comprising at least one atom selected from the elements N, O, halogen, S, Se or Te}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- H01M 2300/0025: Organic electrolyte
- H01M 2300/0028: characterised by the solvent
- 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

An additive for a non-aqueous solution of a lithium secondary battery, a non-aqueous electrolyte solution including the same, and a lithium secondary battery include the same are disclosed herein. In some embodiments, an additive is a compound represented by Formula 1. The additive may suppress dissolution of transition metal by forming a stable film on a surface of a positive electrode. A lithium secondary battery including the non-aqueous electrolyte solution having the additive has improved swelling and capacity characteristics at high voltage and during high-temperature storage because dissolution of metallic impurities causing failure in the battery is suppressed.

## Claims

### Claim 1

An additive for a non-aqueous solution of a lithium secondary battery, wherein the additive is a compound represented by Formula 1:
wherein, in Formula 1,
Y is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms.

### Claim 2 (depends on 1)

The additive for a lithium secondary battery of claim 1, wherein, in Formula 1, Y is a substituted or unsubstituted alkylene group having 2 to 8 carbon atoms.

### Claim 3 (depends on 1)

The additive for a lithium secondary battery of claim 1, wherein, in Formula 1, Y is a substituted or unsubstituted alkylene group having 4 to 8 carbon atoms.

### Claim 4 (depends on 1)

The additive for a lithium secondary battery of claim 1, wherein the additive comprises at least one of compounds represented by Formulae 1a, 1b or 1c:

### Claim 5 (depends on 1)

A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
a lithium salt;
a non-aqueous organic solvent; and
the additive of claim 1.

### Claim 6 (depends on 5)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 5, wherein the additive is present in an amount of 0.1 wt % to 9 wt % based on a total weight of the non-aqueous electrolyte solution.

### Claim 7 (depends on 5)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 5, wherein the additive is present in an amount of 0.5 wt % to 5 wt % based on a total weight of the non-aqueous electrolyte solution.

### Claim 8 (depends on 5)

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

### Claim 9 (depends on 5)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 5, further comprising a second additive for forming a solid electrolyte interphase (SEI), wherein the second additive is at least one selected from the group consisting 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, a benzene-based compound, an amine-based compound, a silane-based compound, and a lithium salt-based compound.

### Claim 10 (depends on 5)

A lithium secondary battery comprising the non-aqueous electrolyte solution of claim 5.