# US 9,437,901 B2 · Additive for electrolyte and electrolyte and rechargeable lithium battery

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- Number: US 9,437,901 B2
- Document ID: US9437901B2
- Status: Granted
- Kind: B2
- Application number: 13/799,461
- Filed: 2013-03-13
- Published: 2014-05-15
- Granted: 2016-09-06
- Earliest claimed: 2012-11-13
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Duck-Hyun Kim; Woo-Cheol Shin; Sang-Il Han; Sang-Hoon Kim; Byung-Joo Chung; Myung-Hwan Jeong; Jung-Yi Yu; Jung-Hyun Nam; Seung-Tae Lee; Tae-Hyun Bae; Mi-Hyun Lee; Eon-Mi Lee; Ha-Rim Lee; Moon-Sung Kim; In-Haeng Cho; E-Rang Cho; Dong-Myung Choi; Vladimir Egorov; Makhmut Khasanov; Pavel Shatunov; Alexey Tereshchenko; Denis Chernyshov
- Web page: https://patentgrep.com/patent/US9437901B2

## CPC

- H01M 10/0567: characterised by the additives
- 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 additive represented by the following Chemical Formula 1, an electrolyte, and a rechargeable lithium battery are disclosed: In Chemical Formula 1, R1 to R3 and L1 to L3 are the same as defined in the detailed description.

## Claims

### Claim 1

An electrolyte for a rechargeable lithium battery, comprising:
a lithium salt,
a non-aqueous organic solvent, and
a first additive represented by the following Chemical Formula 1:
wherein,
R1and R2 are independently C1 to C10 alkyl groups including at least one halogen,
L1to L2 are independently a single bond or a substituted or unsubstituted C1 to C10 alkylene group,
L3 is a single bond or a substituted or unsubstituted C1 alkylene group, and
R3 is a cyano group or a C1 to C10 alkyl group including at least one cyano group.

### Claim 2 (depends on 1)

The electrolyte for a rechargeable lithium battery of claim 1, wherein R1 and R2 are independently —CH2X, —CHX2, —CX3, —CH2(CX3), —CH(CX3)2, or —C(CX3)3, wherein X is the same or different from each other and a halogen, and R3 is —CN, —CH2(CN), —CH (CN)2, or —C(CN)3.

### Claim 3 (depends on 1)

The electrolyte of claim 1, wherein the halogen comprises fluoro (F).

### Claim 4 (depends on 1)

The electrolyte of claim 1, wherein the first additive is represented by the following Chemical Formula 2:

### Claim 5 (depends on 1)

The electrolyte of claim 1, wherein the first additive is included in an amount of about 0.01 to about 50 wt % based on the total amount of the electrolyte.

### Claim 6 (depends on 1)

The electrolyte of claim 1, wherein the first additive is included in an amount of about 0.1 to about 30 wt % based on the total amount of the electrolyte.

### Claim 7 (depends on 1)

The electrolyte of claim 1, wherein the electrolyte further comprises a second additive represented by the following Chemical Formula 3:
wherein, in Chemical Formula 3, Z1 to Z6 are independently a halogen, halogen-containing group, substituted or unsubstituted C1 to C10 alkoxy group, or a substituted or unsubstituted amino group.

### Claim 8 (depends on 7)

The electrolyte of claim 7, wherein the second additive is represented by the following Chemical Formula 4:

### Claim 9 (depends on 7)

The electrolyte of claim 7, wherein the second additive is included in an amount of about 1 to 20 volume % based on the total amount of the electrolyte.

### Claim 10

A rechargeable lithium battery, comprising
a positive electrode including a positive active material,
a negative electrode including a negative active material, and
an electrolyte comprising:
a lithium salt,
a non-aqueous organic solvent, and
a first additive represented by the following Chemical Formula 1:
wherein,
R1 and R2 are independently C1 to C10 alkyl groups including at least one halogen,
L1 to L2 are independently a single bond or a substituted or unsubstituted C1 to C10 alkylene group,
L3 is a single bond or a substituted or unsubstituted C1 alkylene group, and
R3 is a cyano group or a C1 to C10 alkyl group including at least one cyano group.

### Claim 11 (depends on 10)

The rechargeable lithium battery of claim 10, which further comprises a passivation film at least one surface of the positive and negative electrodes.

### Claim 12 (depends on 10)

The rechargeable lithium battery of claim 10, wherein R1 and R2 are independently —CH2X, —CHX2, —CX3, —CH2(CX3), —CH(CX3)2, or —C(CX3)3, wherein X X2 and X3 are the same or different from each other and a halogen, and R3 is —CN, —CH2(CN), —CH (CN)2, or —C(CN)3.

### Claim 13 (depends on 10)

The rechargeable lithium battery of claim 10, wherein the halogen comprises fluoro (F).

### Claim 14 (depends on 10)

The rechargeable lithium battery of claim 10, wherein the first additive is represented by the following Chemical Formula 2:

### Claim 15 (depends on 10)

The rechargeable lithium battery of claim 10, wherein the electrolyte further comprises a second additive represented by the following Chemical Formula 3:
wherein, in Chemical Formula 3, Zi to Z6 are independently a halogen, halogen-containing group, substituted or unsubstituted C1 to C10 alkoxy group, or a substituted or unsubstituted amino group.

### Claim 16 (depends on 15)

The rechargeable lithium battery of claim 15, wherein the second additive is represented by the following Chemical Formula 4: