# US 12,113,170 B2 · Electrolyte composition and secondary battery using same

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- Number: US 12,113,170 B2
- Document ID: US12113170B2
- Status: Granted
- Kind: B2
- Application number: 17/296,461
- Filed: 2019-11-19
- Published: 2021-12-23
- Granted: 2024-10-08
- Earliest claimed: 2018-11-26
- Assignees: Dongwoo Fine-Chem Co., Ltd.
- Applicants: Dongwoo Fine-Chem Co., Ltd.
- Inventors: Kwanwook Song; Joonghan Kum; Seongchul Lee; Han Young Choi
- Web page: https://patentgrep.com/patent/US12113170B2

## CPC

- H01M 10/0567: characterised by the additives
- C07F 7/1804: {Compounds having Si-O-C linkages (Si-O-acyl linkages C07F7/1896)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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
- 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 electrolyte composition contains a propane sultone compound substituted with a specific substituent, a cyclic fluorocarbonate-based compound and a nonaqueous solvent. A secondary battery containing the electrolyte composition is disclosed. The electrolyte composition has excellent SEI film-forming ability and HF-removing ability by containing the cyclic fluorocarbonate-based compound together with the propane sultone compound substituted with a specific substituent, so that the lifespan characteristic and stability at high temperature can be improved.

## Claims

### Claim 1

An electrolyte composition comprising a compound of the formula (1) below, a cyclic fluorocarbonate-based compound, and a nonaqueous solvent,
wherein the cyclic fluorocarbonate-based compound is contained in an amount of 0.5 to 30% by weight, based on 100% by weight of the total electrolyte composition,
wherein,
R is Si[(CH2)xCH3]y[(CH2)2CF3]3-y, and
x, y and z are each independently an integer of 0 to 3.

### Claim 2 (depends on 1)

The electrolyte composition of claim 1, wherein the compound of formula (1) is a compound represented by any one of formulae (2) and (4) to (9):

### Claim 3 (depends on 1)

The electrolyte composition of claim 1, wherein the compound of formula (1) is contained in an amount of 0.05 to 5% by weight, based on 100% by weight of the total electrolyte composition.

### Claim 4 (depends on 1)

The electrolyte composition of claim 1, wherein the cyclic fluorocarbonate-based compound comprises fluoroethylene carbonate.

### Claim 5 (depends on 1)

The electrolyte composition of claim 1, wherein a weight ratio of the compound of formula (1) and the cyclic fluorocarbonate-based compound is 1:1 to 1:20.

### Claim 6 (depends on 1)

The electrolyte composition of claim 1, further comprising a lithium salt.

### Claim 7 (depends on 1)

A secondary battery comprising the electrolyte composition of claim 1.

### Claim 8 (depends on 7)

The secondary battery of claim 7, wherein the secondary battery is a lithium secondary battery.

### Claim 9 (depends on 2)

A secondary battery comprising the electrolyte composition of claim 2.

### Claim 10 (depends on 3)

A secondary battery comprising the electrolyte composition of claim 3.

### Claim 11 (depends on 4)

A secondary battery comprising the electrolyte composition of claim 4.

### Claim 12 (depends on 5)

A secondary battery comprising the electrolyte composition of claim 5.

### Claim 13 (depends on 6)

A secondary battery comprising the electrolyte composition of claim 6.