Electrolyte and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-9847549-B2
Application number	US-201414162705-A
Country	US
Kind code	B2
Filing date	Jan 23, 2014
Priority date	Feb 27, 2013
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

An electrolyte for a rechargeable lithium battery including a lithium salt, a non-aqueous organic solvent, and an additive, wherein the additive includes a compound represented by Chemical Formula 1

and a rechargeable lithium battery including the same.

First claim

What is claimed is:

1. An electrolyte for a rechargeable lithium battery, comprising
a lithium salt, a non-aqueous organic solvent, and an additive, the additive comprising a compound represented by the following Chemical Formula 1:

wherein,
L 1 to L 3 are each independently selected from a substituted or unsubstituted ethylene group and a substituted or unsubstituted propylene group.

2. The electrolyte of claim 1 , wherein the compound represented by Chemical Formula 1 is a compound represented by the following Chemical Formula 1-1 or a compound represented by the following Chemical Formula 1-2:

3. The electrolyte of claim 1 , wherein the compound represented by Chemical Formula 1 is included in an amount of about 0.1 parts by weight to about 5 parts by weight based on 100 parts by weight of the non-aqueous organic solvent.

4. The electrolyte of claim 1 , wherein the additive further comprises a cyclic sultone derivative.

5. The electrolyte of claim 4 , wherein the cyclic sultone derivative is selected from 1,3-propanesultone (PS), 1-methyl-1,3-propanesultone, 2-methyl-1,3-propanesultone, 3-methyl-1,3-propanesultone, 1-ethyl-1,3-propanesultone, 2-ethyl-1,3-propanesultone, 3-ethyl-1,3-propanesultone, 1,2-dimethyl-1,3-propanesultone, 1,3-dimethyl-1,3-propanesultone, 2,3-dimethyl-1,3-propanesultone, 1-methyl-2-ethyl-1,3-propanesultone, 1-methyl-3-ethyl-1,3-propanesultone, 2-methyl-3-ethyl-1,3-propanesultone, 1-ethyl-2-methyl-1,3-propanesultone, 1-ethyl-3-methyl-1,3-propanesultone, 2-ethyl-3-methyl-1,3-propanesultone, 1-fluoromethyl-1,3-propanesultone, 2-fluoromethyl-1,3-propanesultone, 3-fluoromethyl-1,3-propanesultone, 1-trifluoromethyl-1,3-propanesultone, 2-trifluoromethyl-1,3-propanesultone, 3-trifluoromethyl-1,3-propanesultone, 1-fluoro-1,3-propanesultone, 2-fluoro-1,3-propanesultone, 3-fluoro-1,3-propanesultone, 1,2-difluoro-1,3-propanesultone, 1,3-difluoro-1,3-propanesultone, and 2,3-difluoro-1,3-propanesultone.

6. The electrolyte of claim 4 , wherein the cyclic sultone derivative is 1,3-propanesultone (PS).

7. The electrolyte of claim 4 , wherein the cyclic sultone derivative is included in an amount of about 0.1 parts to about 5 parts by weight based on 100 parts by weight of the non-aqueous organic solvent.

8. The electrolyte of claim 1 , wherein the additive further comprises an aliphatic dinitrile compound.

9. The electrolyte of claim 8 , wherein the aliphatic dinitrile compound is a C1 to C12 linear or branched dinitrile compound.

10. The electrolyte of claim 8 , wherein the aliphatic dinitrile compound is selected from succinonitrile, sebaconitrile, glutaronitrile, adiponitrile, 1,5-dicyanopentane, 1,6-dicyanohexane, 1,7-dicyanoheptane, 1,8-dicyanooctane, 1,9-dicyanononane, 1,10-dicyanodecane, 1,12-dicyanododecane, tetramethylsuccinonitrile, 2-methylglutaronitrile, 2,4-dimethylglutaronitrile, 2,2,4,4-tetramethylglutaronitrile, 1,4-dicyanopentane, 2,5-dimethyl-2,5-hexane dicarbonitrile, 2,6-dicyanoheptane, 2,7-dicyanooctane, 2,8-dicyanononane, and 1,6-dicyanodecane.

11. The electrolyte of claim 8 , wherein the aliphatic dinitrile compound is included in an amount of about 0.1 parts to about 5 parts by weight based on 100 parts by weight of the non-aqueous organic solvent.

12. A rechargeable lithium battery comprising
a positive electrode,
a negative electrode, and
an electrolyte comprising
a lithium salt, a non-aqueous organic solvent, and an additive, the additive comprising a compound represented by the following Chemical Formula 1:

wherein,
L 1 to L 3 are each independently selected from a substituted or unsubstituted ethylene group and a substituted or unsubstituted propylene group.

13. The rechargeable lithium battery of claim 12 , wherein the compound represented by Chemical Formula 1 is included in an amount of about 0.1 parts by weight to about 5 parts by weight based on 100 parts by weight of the non-aqueous organic solvent.

14. The rechargeable lithium battery of claim 12 , wherein the additive further comprises a cyclic sultone derivative.

15. The rechargeable lithium battery of claim 14 , wherein the cyclic sultone derivative is included in an amount of about 0.1 parts to about 5 parts by weight based on 100 parts by weight of the non-aqueous organic solvent.

16. The rechargeable lithium battery of claim 12 , wherein the additive further comprises an aliphatic dinitrile compound.

17. The rechargeable lithium battery of claim 16 , wherein the aliphatic dinitrile compound is included in an amount of about 0.1 parts to about 5 parts by weight based on 100 parts by weight of the non-aqueous organic solvent.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Seung-Tae
• Yu Jung-Yi
• Shin Woo-Cheol
• Han Sang-Il
• Kim Sang-Hoon
• Chung Byung-Joo
• Kim Duck-Hyun
• Jeong Myung-Hwan
• 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 Alexandrovich
• Tereshchenko Alexey
• Chernyshov Denis

Classifications

• C01B25/26

  Phosphates (perphosphates C01B15/16) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic