# US 11,309,583 B2 · Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

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- Number: US 11,309,583 B2
- Document ID: US11309583B2
- Status: Granted
- Kind: B2
- Application number: 16/634,959
- Filed: 2018-11-13
- Published: 2020-07-09
- Granted: 2022-04-19
- Earliest claimed: 2017-11-13
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Ha Eun Kim; Young Min Lim; Gwang Yeon Kim; Chul Haeng Lee
- Web page: https://patentgrep.com/patent/US11309583B2

## CPC

- H01M 10/0567: characterised by the additives
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- 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 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0025: Organic electrolyte
- H01M 2300/0051: Carbonates
- 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 an embodiment, a non-aqueous electrolyte solution for a lithium secondary battery includes a lithium salt, an organic solvent, and an additive, wherein the additive is a mixed additive which includes lithium difluorophosphate, fluorobenzene, tetravinylsilane, and a compound containing one sulfonate group or sulfate group in a weight ratio of 1:2:0.05:0.5 to 1:8:0.3:2.

## Claims

### Claim 1

A non-aqueous electrolyte solution for a lithium secondary battery, comprising:
a lithium salt;
an organic solvent; and
a mixed additive,
wherein the mixed additive includes lithium difluorophosphate, fluorobenzene, tetravinylsilane, and a compound containing one sulfonate group or sulfate group in a weight ratio of 1:2:0.05:0.5 to 1:8:0.3:2.

### Claim 2 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the weight ratio is in a range of 1:2:0.05:0.5 to 1:6:0.3:1.5.

### Claim 3 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the compound containing one sulfonate group or sulfate group comprises at least one selected from the group consisting of ethylene sulfate, trimethylene sulfate, methyl trimethylene sulfate, 1,3-propane sultone, 1,4-butane sultone, ethene sultone, 1,4-butene sultone, 1-methyl-1,3-propene sultone, and 1,3-propene sultone.

### Claim 4 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the compound containing one sulfonate group or sulfate group comprises at least one selected from the group consisting of ethylene sulfate, trimethylene sulfate, 1,3-propane sultone, and 1,3-propene sultone.

### Claim 5 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, wherein the mixed additive is included in an amount of 1 wt % to 18 wt % based on a total weight of the non-aqueous electrolyte solution for a lithium secondary battery.

### Claim 6 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, further comprising at least one first additive for forming a solid electrolyte interface (SEI) which is selected from the group consisting of a halogen-substituted carbonate-based compound, a nitrile-based compound, a cyclic carbonate-based compound, a phosphate-based compound, a borate-based compound, and a lithium salt-based compound.

### Claim 7 (depends on 1)

The non-aqueous electrolyte solution for a lithium secondary battery of claim 1, further comprising at least one second additive for forming an SEI which is selected from the group consisting of diphenyl disulfide, di-p-tolyl disulfide, and bis(4-methoxyphenyl) disulfide (BMPDS).

### Claim 8 (depends on 1)

A lithium secondary battery comprising:
a negative electrode;
a positive electrode;
a separator disposed between the negative electrode and the positive electrode; and
the non-aqueous electrolyte solution of claim 1.

### Claim 9 (depends on 8)

The lithium secondary battery of claim 8, wherein the positive electrode includes a positive electrode active material, wherein the positive electrode active material comprises a lithium-nickel-manganese-cobalt-based oxide.

### Claim 10 (depends on 9)

The lithium secondary battery of claim 9, wherein the lithium-nickel-manganese cobalt-based oxide comprises at least one selected from the group consisting of Li(Ni1/3Mn1/3Co1/3)O2, Li(Ni0.35Mn0.28Co0.37)O2, Li(Ni0.6Mn0.2Co0.2)O2, Li(Ni0.5Mn0.3Co0.2)O2, Li(Ni0.7Mn0.15Co0.15)O2, and Li(Ni0.8Mn0.1Co0.1)O2.