Fluorinated electrolyte compositions

Patent metadata

Field	Value
Publication number	US-9979050-B2
Application number	US-201214241894-A
Country	US
Kind code	B2
Filing date	Aug 31, 2012
Priority date	Sep 2, 2011
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

Electrolyte compositions containing a solvent mixture comprising 2,2,-difluoroethyl acetate and ethylene carbonate are described. The electrolyte compositions are useful in electrochemical cells, such as lithium ion batteries.

First claim

What is claimed is:

1. An electrolyte composition comprising:
(a) at least one electrolyte salt;
(b) a solvent mixture comprising ethylene carbonate at a concentration of about 10% to about 50% by weight of the solvent mixture; and CH 3 CO 2 CH 2 CF 2 H at a concentration of about 50% to about 90% by weight of the solvent mixture; and
(c) fluoroethylene carbonate at a concentration of about 0.01% to less than 2% by weight of the electrolyte composition.

2. The electrolyte composition of claim 1 , wherein the electrolyte salt is selected from one or more members of the group consisting of:
lithium hexafluorophosphate,
LiPF 3 (CF 2 CF 3 ) 3 ,
lithium bis(trifluoromethanesulfonyl)imide,
lithium bis (perfluoroethanesulfonyl)imide,
lithium (fluorosulfonyl) (nonafluorobutanesulfonyl)imide,
lithium bis(fluorosulfonyl)imide,
lithium tetrafluoroborate,
lithium perchlorate,
lithium hexafluoroarsenate,
lithium trifluoromethanesulfonate,
lithium tris (trifluoromethanesulfonyl)methide,
lithium bis(oxalato)borate,
lithium difluoro(oxalato)borate,
Li 2 B 12 F 12-x H x where x is equal to 0 to 8, and
a mixture of lithium fluoride and an anion receptor.

3. The electrolyte composition of claim 2 wherein the electrolyte salt is lithium hexafluorophosphate.

4. The electrolyte composition of claim 1 , wherein the ethylene carbonate comprises about 30% by weight of the solvent mixture and the CH 3 CO 2 CH 2 CF 2 H comprises about 70% by weight of the solvent mixture.

5. The electrolyte composition of claim 1 , wherein the fluoroethylene carbonate comprises about 1% by weight of the electrolyte composition.

6. An electrochemical cell comprising:
(a) a housing;
(b) an anode and a cathode disposed in said housing and in conductive contact with one another;
(c) an electrolyte composition disposed in said housing and providing an ionically conductive pathway between said anode and said cathode, wherein the electrolyte composition comprises:
(i) at least one electrolyte salt;
(ii) a solvent mixture comprising ethylene carbonate at a concentration of about 10% to about 50% by weight of the solvent mixture; and CH 3 CO 2 CH 2 CF 2 H at a concentration of about 50% to about 90% by weight of the solvent mixture; and
(iii) fluoroethylene carbonate at a concentration of about 0.01% to less than 2% by weight of the electrolyte composition; and

(d) a porous separator between said anode and said cathode.

7. The electrochemical cell of claim 6 , wherein the ethylene carbonate comprises about 30% by weight of the solvent mixture and the CH 3 CO 2 CH 2 CF 2 H comprises about 70% by weight of the solvent mixture.

8. The electrochemical cell of claim 6 , wherein the fluoroethylene carbonate comprises about 1% by weight of the electrolyte composition.

9. The electrochemical cell of claim 6 , wherein said electrochemical cell is a lithium ion battery.

10. An electronic device comprising an electrochemical cell according to claim 6 .

Assignees

• Holstein William L
• Chen Xudong
• Liu Jun J
• Roelofs Mark Gerrit
• Solvay

Inventors

• Holstein William L
• Chen Xudong
• Liu Jun J
• Roelofs Mark Gerrit

Classifications

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01M10/0525 Primary

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

• H01M10/0567

  characterised by the additives · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title