Electrolyte for rechargeable lithium battery and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-9966633-B2
Application number	US-201514685495-A
Country	US
Kind code	B2
Filing date	Apr 13, 2015
Priority date	Jul 3, 2014
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

Disclosed are an electrolyte for a rechargeable lithium battery including a lithium salt, organic solvent and an additive including a compound represented by the following Chemical Formula 1 and a rechargeable lithium battery including the same.

In the above Chemical Formula 1, R is the same as described in the detailed description.

First claim

What is claimed is:

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

wherein,
R is a C 1 to C 10 alkylene group, a cyclohexylene group, a phenylene group, or a benzylene group;
wherein R is optionally substituted with at least one of selected from F, Br, Cl I, a hydroxy group, an alkoxy group, a nitro group, a cyano group, an amino group, an azido group, an amidino group, a hydrazino group, a hydrazono group, a carbonyl group, a carbamyl group, a thiol group, an ester group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C1 to C20 alkyl group, a C2 to C20 alkenyl group, a C2 to C20 alkynyl group, a C6 to C30 aryl group, a C7 to C30 arylalkyl group, a C1 to C4 alkoxy group, a C1 to C20 heteroalkyl group, a C3 to C20 heteroarylalkyl group, a C3 to C30 cycloalkyl group, a C3 to C15 cycloalkenyl group, a C6 to C15 cycloalkynyl group, a C2 to C20 heterocycloalkyl group,
and a combination thereof
wherein Chemical Formula 1 is included in an amount of about 0.01 parts by weight to about 5 parts by weight based on 100 parts by weight of the organic solvent.

2. The electrolyte for a rechargeable lithium battery of claim 1 , wherein R is the C 1 to C 10 alkylene group.

3. The electrolyte for a rechargeable lithium battery of claim 2 , wherein the alkylene group is a C 1 to C 5 alkylene group.

4. The electrolyte for a rechargeable lithium battery of claim 2 , wherein the alkylene group is a C 1 to C 3 alkylene group.

5. The electrolyte for a rechargeable lithium battery of claim 1 , wherein the additive includes a compound represented by the following Chemical Formula:

6. The electrolyte for a rechargeable lithium battery of claim 1 , wherein the additive includes a compound represented by the following Chemical

7. The electrolyte for a rechargeable lithium battery of claim 1 , wherein the compound represented by the above Chemical Formula 1 is included in an amount of about 0.1 parts by weight to about 3 parts by weight based on 100 parts by weight of the organic solvent.

8. The electrolyte for a rechargeable lithium battery of claim 1 , wherein the additive further comprises fluoroethylene carbonate, vinylethylene carbonate, propane sultone, propene sultone, succinonitrile, adiponitrile, vinylene carbonate, succinic anhydride, hexanetricarbonitrile, or a combination thereof.

9. The electrolyte for a rechargeable lithium battery of claim 1 , wherein the organic solvent comprises a carbonate-based compound, an ester-based compound, an ether-based compound, a ketone-based compound, an alcohol-based compound, or a combination thereof.

10. A rechargeable lithium battery, comprising
a positive electrode;
a negative electrode; and
an electrolyte comprising:
a lithium salt;
an organic solvent; and
an additive including a compound represented by the following Chemical Formula 1:

wherein,
R is a C 1 to C 10 alkylene group, a cyclohexylene group, a phenylene group, or a benzylene group;
wherein R is optionally substituted with at least one of selected from F, Br, Cl I, a hydroxy group, an alkoxy group, a nitro group, a cyano group, an amino group, an azido group, an amidino group, a hydrazino group, a hydrazono group, a carbonyl group, a carbamyl group, a thiol group, an ester group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C1 to C20 alkyl group, a C2 to C20 alkenyl group, a C2 to C20 alkynyl group, a C6 to C30 aryl group, a C7 to C30 arylalkyl group, a C1 to C4 alkoxy group, a C1 to C20 heteroalkyl group, a C3 to C20 heteroarylalkyl group, a C3 to C30 cycloalkyl group, a C3 to C15 cycloalkenyl group, a C6 to C15 cycloalkynyl group, a C2 to C20 heterocycloalkyl group,
and a combination thereof;
wherein Chemical Formula 1 is included in an amount of about 0.01 parts by weight to about 5 parts by weight based on 100 parts by weight of the organic solvent.

11. The rechargeable lithium battery of claim 10 , wherein R is the C 1 to C 10 alkylene group.

12. The rechargeable lithium battery of claim 11 , wherein the alkylene group is a C 1 to C 5 alkylene group.

13. The rechargeable lithium battery of claim 10 , wherein the compound represented by the above Chemical Formula 1 is included in an amount of about 0.1 parts by weight to about 3 parts by weight based on 100 parts by weight of the organic solvent.

14. The rechargeable lithium battery of claim 10 , wherein the additive further comprises fluoroethylene carbonate, vinylethylene carbonate, propane sultone, propene sultone, succinonitrile, adiponitrile, vinylene carbonate, succinic anhydride, hexanetricarbonitrile, or a combination thereof.

15. The rechargeable lithium battery of claim 10 , wherein the organic solvent comprises a carbonate-based compound, an ester-based compound, an ether-based compound, a ketone-based compound, an alcohol-based compound, or a combination thereof.

16. The rechargeable lithium battery of claim 10 , wherein the additive includes a compound represented by the following Chemical Formula:

17. The rechargeable lithium battery of claim 10 , wherein the additive includes a compound represented by the following Chemical Formula

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Yun-Hee
• Yang Ho-Seok
• Park Young Sam
• Lim Jin-Hyeok
• Hwang Hee-Yeon
• Kim Hyun-Woo
• Park Se-Jeong
• Lee Min-Young

Classifications

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M2300/004

  Three solvents · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title