Electrolyte for lithium secondary battery, and lithium secondary battery containing same

Patent metadata

Field	Value
Publication number	US-11600862-B2
Application number	US-201716305092-A
Country	US
Kind code	B2
Filing date	May 29, 2017
Priority date	Jun 2, 2016
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

The present invention relates to an electrolyte for a lithium secondary battery, comprising an organic solvent, a lithium salt and a compound of Chemical Formula 1, wherein the compound of Chemical Formula 1 is contained in an amount of 0.001 wt % or more and less than 0.1 wt %.

In Chemical Formula 1, n is one of the integers 3 to 10.

First claim

The invention claimed is:

1. An electrolyte for a lithium secondary battery, wherein a positive active material of the lithium secondary battery includes lithium and cobalt, the electrolyte comprising:
an organic solvent, a lithium salt, and a compound of Chemical Formula 1,
wherein the organic solvent comprises a combination of a carbonate based solvent and an ester based solvent,
wherein the compound of Chemical Formula 1 is contained in an amount of 0.001 wt % or more and less than 0.03 wt %:

wherein, in Chemical Formula 1
n is one of the integers 3 to 10.

2. The electrolyte for a lithium secondary battery of claim 1 , wherein in Chemical Formula 1, n is an integer of 3 to 5.

3. The electrolyte for a lithium secondary battery of claim 1 , wherein the lithium salt comprises LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiN(SO 2 CF 3 ) 2 , LiN(SO 3 C 2 F 5 ) 2 , 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 )(x and y are natural numbers), LiC 1 , LiI, LiB(C 2 O 4 ) 2 , or a combination thereof.

4. The electrolyte for a lithium secondary battery of claim 1 , wherein a concentration of the lithium salt is 0.1 M to 2.0 M.

5. A lithium secondary battery, comprising:
a negative electrode including a negative active material,
a positive electrode including a positive active material, the positive active material including lithium and cobalt, and
the electrolyte for a lithium secondary battery of claim 1 .

6. The lithium secondary battery of claim 5 , wherein the lithium secondary battery is operated at a high voltage of 4.4 V or greater.

7. The electrolyte for a lithium secondary battery of claim 1 , wherein n is an integer of 4 to 10.

8. An electrolyte for a lithium secondary battery, wherein a positive active material of the lithium secondary battery includes lithium and cobalt, the electrolyte comprising:
an organic solvent, a lithium salt, and a compound of Chemical Formula 1,
wherein the organic solvent comprises a combination of a carbonate based solvent and an ester based solvent,
wherein the compound of Chemical Formula 1 is contained in an amount of 0.001 wt % or more and less than 0.08 wt %:

wherein, in Chemical Formula 1, n is an integer of 4 to 10.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Yunhee
• Yang Hoseok
• Lee Minyoung
• Park Sejeong
• Kim Hyunwoo
• Koh Sujeong

Classifications

• C08G2261/226

  Oligomers, i.e. up to 10 repeat units · CPC title

• H01M10/0525

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

• H01M2300/0025

  Organic electrolyte · CPC title

• C08G2261/92

  TFT applications · CPC title

• C08G2261/11

  Homopolymers · CPC title