Electrolyte and rechargeable lithium battery including the same

Patent metadata

Field	Value
Publication number	US-9660295-B2
Application number	US-201514790585-A
Country	US
Kind code	B2
Filing date	Jul 2, 2015
Priority date	Aug 22, 2014
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

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

wherein, in Chemical Formula 1, R 1 to R 3 are each independently a substituted or unsubstituted C1 to C10 alkylene group, a substituted or unsubstituted C3 to C30 cycloalkylene group, a substituted or unsubstituted C6 to C30 arylene group, or a substituted or unsubstituted C2 to C30 heteroarylene group.

First claim

What is claimed is:

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

wherein, in Chemical Formula 1, R 1 to R 3 are each independently a substituted or unsubstituted C1 to C10 alkylene group, a substituted or unsubstituted C3 to C30 cycloalkylene group, a substituted or unsubstituted C6 to C30 arylene group, or a substituted or unsubstituted C2 to C30 heteroarylene group, further provided that at least one of R 1 to R 3 is the substituted or unsubstituted C6 to C30 arylene group.

2. The electrolyte for a rechargeable lithium battery as claimed in claim 1 , wherein, in Chemical Formula 1, R 1 to R 3 are a substituted or unsubstituted C6 to C30 arylene group.

3. The electrolyte for a rechargeable lithium battery as claimed in claim 1 , wherein the additive represented by Chemical Formula 1 is included in the electrolyte in an amount of about 2 wt % to about 5 wt %, based on a total weight of the electrolyte for a rechargeable lithium battery.

4. The electrolyte for a rechargeable lithium battery as claimed in claim 1 , wherein the lithium salt includes LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiC 4 F 9 SO 3 , LiClO 4 , LiAlO 2 , LiAlCl 4 , LiN(C x F 2x+1 SO 2 )(C y F 2y+1 SO 2 ), in which x and y are natural numbers, LiCl, LiI, or a combination thereof.

5. The electrolyte for a rechargeable lithium battery as claimed in claim 1 , wherein the lithium salt is included in the electrolyte at a concentration of about 0.1 M to about 2.0 M.

6. The electrolyte for a rechargeable lithium battery as claimed in claim 1 , wherein the non-aqueous organic solvent includes about 20 wt % or more of ethylene carbonate, based on a total weight of the non-aqueous organic solvent.

7. A rechargeable lithium battery, comprising:
the electrolyte as claimed in claim 1 ;
a positive electrode; and
a negative electrode.

8. The rechargeable lithium battery as claimed in claim 7 , wherein:
the positive electrode includes a positive active material, and
the positive active material includes a lithium cobalt-based oxide.

9. The rechargeable lithium battery as claimed in claim 7 , wherein the rechargeable lithium battery is a prismatic battery having an area of greater than or equal to about 50 cm 2 .

10. The electrolyte for a rechargeable lithium battery as claimed in claim 1 , wherein, in Chemical Formula 1, R 1 to R 3 are an unsubstituted C1 to C 10 alkylene group, unsubstituted C3 to C30 cycloalkylene group, unsubstituted C6 to C30 arylene group, or unsubstituted C2 to C30 heteroarylene group, at least one of R 1 to R 3 being substituted or unsubstituted C6 to C30 arylene group.

11. The electrolyte for a rechargeable lithium battery as claimed in claim 10 , wherein, in Chemical Formula 1, R 1 to R 3 are the unsubstituted C6 to C30 arylene group.

12. The electrolyte for a rechargeable lithium battery as claimed in claim 10 , wherein, in Chemical Formula 1, R 1 to R 3 are an unsubstituted phenylene group.

Assignees

• Samsung Sdi Co Ltd

Inventors

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

Classifications

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M10/0569

  characterised by the solvents · CPC title