# US 2017/0288268 A1 · Electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same

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- Number: US 2017/0288268 A1
- Document ID: US20170288268A1
- Status: Published application
- Kind: A1
- Application number: 15/266,549
- Filed: 2016-09-15
- Published: 2017-10-05
- Earliest claimed: 2016-04-04
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Yun-Hee KIM; Ho-Seok YANG; Min-Young LEE; Se-Jeong PARK; Hyun-Woo KIM; Su-Jeong KOH
- Web page: https://patentgrep.com/patent/US20170288268A1

## CPC

- H01M 10/0567: characterised by the additives
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0569: characterised by the solvents
- H01M 10/0568: characterised by the solutes
- H01M 2300/0025: Organic electrolyte
- H01M 2300/0031: Chlorinated solvents
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An electrolyte for a rechargeable lithium battery includes an organic solvent including C3 to C5 alkyl propionate, and the electrolyte further includes a lithium salt and a compound represented by Chemical Formula 1, wherein, in Chemical Formula 1, k, l, and m are independently integers of 0 to 20, k, l, and m are selected, so that Chemical Formula 1 has an asymmetric structure, n is an integer of 1 to 7, and R1, R2, R3, R4, R5, and R6 are independently hydrogen, an alkyl group, an alkoxy group, or a fluoroalkyl group.

## Claims

### Claim 1

An electrolyte for a rechargeable lithium battery, the electrolyte comprising:
an organic solvent including C3 to C5 alkyl propionate;
a lithium salt; and
a compound represented by Chemical Formula 1:
wherein, in Chemical Formula 1,
k, l, and m are independently integers of 0 to 20, k, l, and m being selected so that Chemical Formula 1 has an asymmetric structure,
n is an integer of 1 to 7, and
R1, R2, R3, R4, R5, and R6 are independently hydrogen, an alkyl group, an alkoxy group, or a fluoroalkyl group.

### Claim 2 (depends on 1)

The electrolyte as claimed in claim 1, wherein the C3 to C5 alkyl propionate is included in an amount of about 10 volume % to about 80 volume % based on the total amount of the organic solvent.

### Claim 3 (depends on 2)

The electrolyte as claimed in claim 2, wherein the C3 to C5 alkyl propionate includes one or more of propyl propionate, N-butyl propionate, tert-butyl propionate, isobutyl propionate, N-pentyl propionate, 2-pentyl propionate, tert-pentyl propionate, or isopentyl propionate.

### Claim 4 (depends on 2)

The electrolyte as claimed in claim 2, wherein the compound represented by Chemical Formula 1 is included in an amount of about 0.05 wt % to about 10 wt % based on the total weight of the electrolyte for a rechargeable lithium battery.

### Claim 5 (depends on 4)

The electrolyte as claimed in claim 4, wherein the compound represented by Chemical Formula 1 includes one or more of hexane tricyanide, pentane tricyanide, or fluorohexane tricyanide.

### Claim 6 (depends on 5)

The electrolyte as claimed in claim 5, wherein the electrolyte further includes succinonitrile.

### Claim 7 (depends on 1)

The electrolyte as claimed in claim 1, wherein in Chemical Formula 1, n is an integer of 1 to 5, and k, l, and m are independently integers of 0 to 10.

### Claim 8 (depends on 1)

The electrolyte as claimed in claim 1, wherein in Chemical Formula 1, n is an integer of 1 to 3, and k, l, and m are independently integers of 0 to 7.

### Claim 9 (depends on 1)

The electrolyte as claimed in claim 1, wherein in Chemical Formula 1, n is 1 or 2, k is 0, and l and m are independently integers of 1 to 5.

### Claim 10 (depends on 1)

The electrolyte as claimed in claim 1, wherein in Chemical Formula 1, k, l, and m are different integers from each other.

### Claim 11 (depends on 1)

The electrolyte as claimed in claim 1, wherein the lithium salt includes LiPF6, LiBF4, LiSbF6, LiAsF6, LiN(SO2CF3)2, LiN(SO3C2F5)2, LiC4F9SO3, LiClO4, LiAlO2, LiAlCl4, LiN(CxF2x+1SO2)(CyF2y+1SO2), wherein x and y are natural numbers, LiCl, LiI, LiB(C2O4)2, or a combination thereof.

### Claim 12 (depends on 1)

The electrolyte as claimed in claim 1, wherein a concentration of the lithium salt is about 0.1 M to about 2.0 M.

### Claim 13 (depends on 1)

The electrolyte as claimed in claim 1, wherein the electrolyte for a rechargeable lithium battery includes one or more additives selected from fluoroethylene carbonate, vinylethylene carbonate, succinonitrile, polysulfone, and a combination thereof.

### Claim 14 (depends on 1)

A rechargeable lithium battery comprising:
a negative electrode including a negative active material,
a positive electrode including a positive active material, and
the electrolyte as claimed in claim 1.

### Claim 15 (depends on 14)

The rechargeable lithium battery as claimed in claim 14, wherein the rechargeable lithium battery is operated at a voltage of about 4.4 V or greater.