Electrolyte for rechargeable lithium battery and rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-10069167-B2
Application number	US-201615177628-A
Country	US
Kind code	B2
Filing date	Jun 9, 2016
Priority date	Sep 3, 2015
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

An electrolyte for a rechargeable lithium battery includes a non-aqueous organic solvent; a lithium salt; a first compound represented by Chemical Formula 1; and a second compound represented by Chemical Formula 2, wherein an amount of the first compound is about 0.05 wt % to about 10 wt % and an amount of the second compound is about 0.05 wt % to about 10 wt %.

In Chemical Formulae 1 and 2, the substituents 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 non-aqueous organic solvent;
a lithium salt;
a first compound, wherein the first compound is hexanetricyanide, pentatricyanide, fluorohexanetricyanide or a combination thereof; and
a second compound, wherein the second compound is γ-butyrolactone, γ-caprolactone, γ-valerolactone, fluoro γ-butyrolactone, or a combination thereof,
wherein an amount of the first compound is about 0.05 wt % to about 10 wt % based on 100 wt % of the electrolyte for the rechargeable lithium battery and
an amount of the second compound is about 0.05 wt % to about 10 wt % based on 100 wt % of the electrolyte for the rechargeable lithium battery.

2. The electrolyte for a rechargeable lithium battery of claim 1 , wherein an amount of the first compound is about 0.5 wt % to about 5 wt % based on 100 wt % of the electrolyte for a rechargeable lithium battery.

3. The electrolyte for a rechargeable lithium battery of claim 1 , wherein an amount of the second compound is about 0.5 wt % to about 5 wt % based on 100 wt % of the electrolyte for a rechargeable lithium battery.

4. The electrolyte for a rechargeable lithium battery of claim 1 , wherein the electrolyte comprises at least one additive selected from fluoroethylene carbonate, vinylethylene carbonate, succinonitrile, polysulfone, and a combination thereof.

5. The electrolyte for a rechargeable lithium battery of claim 1 , wherein the electrolyte is used in a battery operated at a high voltage of greater than or equal to about 4.35 V.

6. A rechargeable lithium battery comprising
a negative electrode including a negative active material,
a positive electrode including a positive active material;
and an electrolyte comprising:
a non-aqueous organic solvent;
a lithium salt;
a first compound, wherein the first compound is hexanetricyanide, pentatricyanide, fluorohexanetricyanide or a combination thereof; and
a second compound, wherein the second compound is γ-butyrolactone, γ-caprolactone, γ-valerolactone, fluoro γ-butyrolactone, or a combination thereof,
wherein an amount of the first compound is about 0.05 wt % to about 10 wt % based on 100 wt % of the electrolyte for the rechargeable lithium battery and
an amount of the second compound is about 0.05 wt % to about 10 wt % based on 100 wt % of the electrolyte for the rechargeable lithium battery.

7. The rechargeable battery of claim 6 , wherein an amount of the first compound is about 0.5 wt % to about 5 wt % based on 100 wt % of the electrolyte for a rechargeable lithium battery.

8. The rechargeable battery of claim 6 , wherein an amount of the second compound is about 0.5 wt % to about 5 wt % based on 100 wt % of the electrolyte for a rechargeable lithium battery.

9. The rechargeable battery of claim 6 , wherein the electrolyte comprises at least one additive selected from fluoroethylene carbonate, vinylethylene carbonate, succinonitrile, polysulfone, and a combination thereof.

Assignees

• Samsung Sdi Co Ltd

Inventors

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

Classifications

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/0525

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

• H01M2300/004

  Three solvents · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title