Additive for electrolyte and electrolyte and rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-9437901-B2
Application number	US-201313799461-A
Country	US
Kind code	B2
Filing date	Mar 13, 2013
Priority date	Nov 13, 2012
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

An electrolyte additive represented by the following Chemical Formula 1, an electrolyte, and a rechargeable lithium battery are disclosed:

In Chemical Formula 1, R 1 to R 3 and L 1 to L 3 are the same as defined in the detailed description.

First claim

What is claimed is:

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,
R 1 and R 2 are independently C 1 to C 10 alkyl groups including at least one halogen,
L 1 to L 2 are independently a single bond or a substituted or unsubstituted C 1 to C 10 alkylene group,
L 3 is a single bond or a substituted or unsubstituted C 1 alkylene group, and
R 3 is a cyano group or a C 1 to C 10 alkyl group including at least one cyano group.

2. The electrolyte for a rechargeable lithium battery of claim 1 , wherein R 1 and R 2 are independently —CH 2 X, —CHX 2 , —CX 3 , —CH 2 (CX 3 ), —CH(CX 3 ) 2 , or —C(CX 3 ) 3 , wherein X is the same or different from each other and a halogen, and R 3 is —CN, —CH 2 (CN), —CH (CN) 2 , or —C(CN) 3 .

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

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

5. 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.

6. 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.

7. 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, Z 1 to Z 6 are independently a halogen, halogen-containing group, substituted or unsubstituted C 1 to C 10 alkoxy group, or a substituted or unsubstituted amino group.

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

9. 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.

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,
R 1 and R 2 are independently C 1 to C 10 alkyl groups including at least one halogen,
L 1 to L 2 are independently a single bond or a substituted or unsubstituted C 1 to C 10 alkylene group,
L 3 is a single bond or a substituted or unsubstituted C 1 alkylene group, and
R 3 is a cyano group or a C 1 to C 10 alkyl group including at least one cyano group.

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

12. The rechargeable lithium battery of claim 10 , wherein R 1 and R 2 are independently —CH 2 X, —CHX 2 , —CX 3 , —CH 2 (CX 3 ), —CH(CX 3 ) 2 , or —C(CX 3 ) 3 , wherein X X 2 and X 3 are the same or different from each other and a halogen, and R 3 is —CN, —CH 2 (CN), —CH (CN) 2 , or —C(CN) 3 .

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

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

15. 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, Z i to Z 6 are independently a halogen, halogen-containing group, substituted or unsubstituted C 1 to C 10 alkoxy group, or a substituted or unsubstituted amino group.

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

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Duck-Hyun
• Shin Woo-Cheol
• Han Sang-Il
• Kim Sang-Hoon
• Chung Byung-Joo
• Jeong Myung-Hwan
• Yu Jung-Yi
• Nam Jung-Hyun
• Lee Seung-Tae
• Bae Tae-Hyun
• Lee Mi-Hyun
• Lee Eon-Mi
• Lee Ha-Rim
• Kim Moon-Sung
• Cho In-Haeng
• Cho E-Rang
• Choi Dong-Myung
• Egorov Vladimir
• Khasanov Makhmut
• Shatunov Pavel
• Tereshchenko Alexey
• Chernyshov Denis

Classifications

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title