# US 9,005,823 B2 · Electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same

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- Number: US 9,005,823 B2
- Document ID: US9005823B2
- Status: Granted
- Kind: B2
- Application number: 13/241,133
- Filed: 2011-09-22
- Published: 2012-11-08
- Granted: 2015-04-14
- Earliest claimed: 2011-05-04
- Assignees: Samsung SDI Co., Ltd.; Soulbrain Co., Ltd.
- Applicants: Duck-Chul Hwang; Eun-Gi Shim; Jong-Hyun Lee; Jong-Su Kim; Young-Min Kim
- Inventors: Duck-Chul Hwang; Eun-Gi Shim; Jong-Hyun Lee; Jong-Su Kim; Young-Min Kim
- Web page: https://patentgrep.com/patent/US9005823B2

## CPC

- H01M 10/0567: characterised by the additives
- H01M 4/362: {Composites}
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- H01M 4/587: for inserting or intercalating light metals
- H01M 10/052: Li-accumulators
- 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

An electrolyte for a rechargeable lithium battery includes a non-aqueous organic solvent, a lithium salt, and an additive. The additive includes a gamma butyrolactone compound substituted with at least one F atom at the α-position.

## Claims

### Claim 1

A rechargeable lithium battery, comprising:
a positive electrode comprising a positive active material;
a negative electrode comprising a negative active material comprising a Si-based active material selected from the group consisting of:
Si;
SiOx wherein 0<x<2;
Si—Y alloys wherein Y is an element selected from the group consisting of alkali metals, alkaline-earth metals, group 13 through group 16 elements, transition elements, rare earth elements, and combinations thereof, but Y is not Si;
carbon-coated SiOx wherein 0<x<2;
Si—C composites; and
combinations thereof; and
an electrolyte comprising:
a non-aqueous organic solvent;
a lithium salt; and
an additive comprising a compound represented by Chemical Formula 1:
wherein:
each of X1 and X2 is independently a halogen or hydrogen, provided that at least one of X1 and X2 is F,
each of R1 through R3 is hydrogen, and
R4 is selected from the group consisting of unsubstituted butyl groups, and unsubstituted hexyl groups.

### Claim 2 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the additive is selected from the group consisting of α,α-difluoro-γ-butyl gammabutyrolactone, α,α-difluoro-γ-hexyl gammabutyrolactone, and combinations thereof.

### Claim 3 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the additive is present in the electrolyte in an amount of about 0.5 to about 10 parts by weight based on 100 parts by weight of the non-aqueous organic solvent and the lithium salt.

### Claim 4 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the additive is present in the electrolyte in an amount of about 2 to about 10 parts by weight based on 100 parts by weight of the non-aqueous organic solvent and the lithium salt.

### Claim 5 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the Si-based active material is selected from the group consisting of:
Si;
SiOx wherein 0<x<2;
carbon-coated SiOx wherein 0<x<2;
Si—C composites; and
combinations thereof.

### Claim 6 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the Si-based active material comprises the carbon-coated SiOx wherein 0<x<2.

### Claim 7 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the negative active material further comprises a carbon-based active material.

### Claim 8 (depends on 7)

The rechargeable lithium battery of claim 7, wherein the carbon-based active material comprises graphite.

### Claim 9 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the negative active material comprises a combination of the Si-based active material and a carbon-based active material, the Si-based active material is present in the negative active material in an amount of about 1 wt % to about 99 wt %, and the carbon-based active material is present in the negative active material in an amount of about 1 wt % to about 99 wt %.

### Claim 10 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the negative active material comprises a combination of the Si-based active material and a carbon-based active material, the Si-based active material is present in the negative active material in an amount of about 10 wt % to about 90 wt %, and the carbon-based active material is present in the negative active material in an amount of about 10 wt % to about 90 wt %.