# US 8,785,056 B2 · Electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same

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- Number: US 8,785,056 B2
- Document ID: US8785056B2
- Status: Granted
- Kind: B2
- Application number: 13/237,664
- Filed: 2011-09-20
- Published: 2012-08-02
- Granted: 2014-07-22
- Earliest claimed: 2011-01-27
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Dai-In Park; Ho-Seok Yang; In-Haeng Cho
- Inventors: Dai-In Park; Ho-Seok Yang; In-Haeng Cho
- Web page: https://patentgrep.com/patent/US8785056B2

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 10/0567: characterised by the additives
- H01M 10/0569: characterised by the solvents
- 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

In one aspect, a rechargeable lithium battery including an electrolyte for the rechargeable lithium battery is provided. The electrolyte for the rechargeable lithium battery includes: a non-aqueous organic solvent; a lithium salt; and a compound represented by Chemical Formula 1.

## Claims

### Claim 1

An electrolyte for a rechargeable lithium battery, comprising:
a non-aqueous organic solvent;
a lithium salt; and
a compound represented by the following Chemical Formula 1:
wherein
R1 to R12 are the same or different, and are each independently hydrogen, a substituted or unsubstituted C1 to C30 aliphatic organic group, a substituted or unsubstituted C3 to C30 alicyclic organic group, or a substituted or unsubstituted C6 to C30 aromatic organic group.

### Claim 2 (depends on 1)

The electrolyte for a rechargeable lithium battery of claim 1, wherein the compound represented by Chemical Formula 1 has the structure of Chemical Formulae 2 to 5:

### Claim 3 (depends on 1)

The electrolyte for a rechargeable lithium battery of claim 1, wherein the additive for the electrolyte for a rechargeable lithium battery is included in an amount of about 0.5 wt % to about 10 wt % based on the total weight of the electrolyte.

### Claim 4 (depends on 1)

The electrolyte for a rechargeable lithium battery of claim 1, wherein the lithium salt comprises a fluorinated lithium salt.

### Claim 5 (depends on 4)

The electrolyte for a rechargeable lithium battery of claim 4, wherein the fluorinated lithium salt is selected from the group consisting of LiPF6, LiBF4, LiSbF6, LiAsF6, LiCF3SO3, LiN(SO2C2F5)2, Li(CF3SO2)2N, LiN(SO3C2F5)2, LiC4F9SO3, LiN(CxF2+1SO2)(CyF2y+1SO2) and combinations thereof, where x and y are natural numbers.

### Claim 6 (depends on 5)

The electrolyte for a rechargeable lithium battery of claim 5, wherein the fluorinated lithium salt is LiPF6.

### Claim 7 (depends on 1)

The electrolyte for a rechargeable lithium battery of claim 1, wherein the electrolyte for a rechargeable lithium battery has an exotherm starting temperature of about 90° C. or higher.

### Claim 8 (depends on 1)

The electrolyte for a rechargeable lithium battery of claim 1, wherein the electrolyte for a rechargeable lithium battery has an expthermic heat of about 250 J/g or less.

### Claim 9

A rechargeable lithium battery, comprising:
a positive electrode having a positive active material;
a negative electrode having a negative active material; and
an electrolyte comprising a non-aqueous organic solvent; a lithium salt; and a compound represented by the following Chemical Formula 1:
wherein
R1 to R12 are the same or different, and are each independently hydrogen, a substituted or unsubstituted C1 to C30 aliphatic organic group, a substituted or unsubstituted C3 to C30 alicyclic organic group, or a substituted or unsubstituted C6 to C30 aromatic organic group.

### Claim 10 (depends on 9)

The rechargeable lithium battery of claim 9, wherein the compound represented by Chemical Formula 1 has the structure of Chemical Formulae 2 to 5:

### Claim 11 (depends on 9)

The rechargeable lithium battery of claim 9, wherein the additive for the electrolyte for a rechargeable lithium battery is included in an amount of about 0.5 wt % to about 10 wt % based on the total weight of the electrolyte.

### Claim 12 (depends on 9)

The rechargeable lithium battery of claim 9, wherein the lithium salt comprises a fluorinated lithium salt.

### Claim 13 (depends on 12)

The rechargeable lithium battery of claim 12, wherein the fluorinated lithium salt is selected from the group consisting of LiPF6, LiBF4, LiSbF6, LiAsF6, LiCF3SO3, LiN(SO2C2F5)2, Li(CF3SO2)2N, LiN(SO3C2F5)2, LiC4F9SO3, LiN(CxF2x+1SO2)(CyF2y+1SO2) and combinations thereof, where x and y are natural numbers.

### Claim 14 (depends on 9)

The rechargeable lithium battery of claim 9, wherein the fluorinated lithium salt is LiPF6.

### Claim 15 (depends on 9)

The rechargeable lithium battery of claim 9, wherein the electrolyte for a rechargeable lithium battery has an exotherm starting temperature of about 90° C. or higher.

### Claim 16 (depends on 9)

The rechargeable lithium battery of claim 9, wherein the electrolyte for a rechargeable lithium battery has an expthermic heat of about 250 J/g or less.