Electrolyte for rechargeable lithium battery and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-10056647-B2
Application number	US-201414536278-A
Country	US
Kind code	B2
Filing date	Nov 7, 2014
Priority date	Nov 20, 2013
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

An electrolyte for a rechargeable lithium battery includes a lithium salt, a non-aqueous organic solvent, and an additive, where the additive includes a compound represented by Chemical Formula 1. A rechargeable lithium battery including the electrolyte includes a positive electrode including a positive active material, a negative electrode including a negative active material, and the electrolyte.

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,
wherein the additive comprises a compound represented by Chemical Formula 1:

wherein, in Chemical Formula 1,
wherein R comprises —CN, —NC, —NCS, —SCN, a C1 to C8 alkyl group substituted with a functional group, a C2 to C12 alkynyl group substituted with a functional group, or a C1 to C12 alkoxy group substituted with a functional group,
wherein the functional group comprises —CN, —NC, —NCS, or —SCN, and
wherein the compound represented by Chemical Formula 1 is present in the electrolyte in an amount of about 0.1 parts by weight to about 10 parts by weight based on 100 parts by weight of the non-aqueous organic solvent.

2. The electrolyte for a rechargeable lithium battery of claim 1 , wherein the additive comprises an other additive comprising vinylene carbonate, metal fluoride, glutaronitrile, succinonitrile, adiponitrile, 3,3′-thiodipropionitrile, 1,3-propane sultone, 1,3-propene sultone, lithium bis(oxalato)borate, lithium tetrafluoroborate, vinylethylene carbonate, fluoroethylene carbonate, difluoroethylene carbonate, fluorodimethyl carbonate, fluoroethylmethyl carbonate, or a mixture thereof,
wherein the other additive is present in the electrolyte in an amount of about 0.1 parts by weight to about 10 parts by weight based on 100 parts by weight of the non-aqueous organic solvent.

3. A rechargeable lithium battery comprising:
a positive electrode;
a negative electrode; and
the electrolyte of claim 1 .

4. The rechargeable lithium battery of claim 3 , wherein the rechargeable lithium battery comprises a solid electrolyte interface (SEI) protection film on a surface of the negative electrode.

5. The rechargeable lithium battery of claim 3 , wherein the rechargeable lithium battery comprises a solid electrolyte interface (SEI) protection film on a surface of the positive electrode.

6. The rechargeable lithium battery of claim 5 , wherein the SEI protection film on the surface of the positive electrode comprises a coordination compound comprising a metal comprising Co, Mn, and/or Ni and a functional group coordinated to the metal, the functional group comprising —CN, —NC, —NCS, and/or —SCN.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Duck-Hyun
• Kim Moon-Sung
• Cho E-Rang
• Lee Jeong-Hye

Classifications

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/4235

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