High voltage solid electrolyte compositions

Patent metadata

Field	Value
Publication number	US-10135093-B2
Application number	US-201615085936-A
Country	US
Kind code	B2
Filing date	Mar 30, 2016
Priority date	Mar 30, 2016
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

An electrochemical cell having an anode, a solid electrolyte, and a cathode. The solid electrolyte includes a polymer gel formed from an ethylene oxide polymer combined with a liquid precursor. The liquid precursor contains at least 15 molar percent of a lithium salt in a solvent.

First claim

We claim:

1. An electrochemical cell, comprising:
an anode;
a cathode comprising an electrode active material; and
a gel electrolyte film layer comprising: (i) a polymer gel, wherein the polymer gel comprises an ethylene oxide polymer portion; (ii) a liquid portion, wherein the liquid portion comprises a solvent; and (iii) at least 6 weight percent of a lithium salt;
wherein the electrolyte is electrochemically stable at voltages greater than about 4.4 V.

2. The electrochemical cell of claim 1 , wherein the liquid portion comprises butylene carbonate.

3. The electrochemical cell of claim 1 , wherein the liquid portion comprises butyl sulfoxide.

4. The electrochemical cell of claim 1 , wherein the liquid portion comprises n-methyl-2-pyrrolidone.

5. The electrochemical cell of claim 2 , wherein the lithium salt comprises lithium bis(trifluoromethanesulfonyl)imide.

6. The electrochemical cell of claim 1 , wherein the liquid portion comprises butylene carbonate and the lithium salt is lithium bis(trifluoromethanesulfonyl)imide.

7. The electrochemical cell of claim 4 , wherein the lithium salt comprises lithium bis(trifluoromethanesulfonyl)imide.

8. The electrochemical cell of claim 1 , wherein the liquid portion comprises n-methyl-2-pyrrolidone and the lithium salt is lithium bis(trifluoromethanesulfonyl)imide.

9. The electrochemical cell of claim 2 , wherein the lithium salt comprises lithium tetrafluoroborate.

10. The electrochemical cell of claim 1 , wherein the liquid portion comprises butylene carbonate and the lithium salt is lithium tetrafluoroborate.

11. The electrochemical cell of claim 3 , wherein the lithium salt comprises lithium tetrafluoroborate.

12. The electrochemical cell of claim 1 , wherein the liquid portion comprises butyl sulfoxide and the lithium salt is lithium tetrafluoroborate.

13. The electrochemical cell of claim 1 , wherein the ethylene oxide polymer is represented by:

where n≥1, R 1 , R 2 , R 3 , and R 4 are each independently selected from the group consisting of hydrogen, substituted and unsubstituted hydride groups, substituted and unsubstituted hydroxy groups, substituted and unsubstituted alkyl groups, substituted and unsubstituted alkenyl groups, substituted and unsubstituted alkynyl groups, substituted and unsubstituted aryl groups, substituted and unsubstituted iminyl groups, substituted and unsubstituted alkoxy groups, substituted and unsubstituted alkenoxy groups, substituted and unsubstituted alkynoxy groups, substituted and unsubstituted aryloxy groups, substituted and unsubstituted vinyl groups, substituted and unsubstituted acrylic groups, and substituted and unsubstituted acryloyl groups.

Assignees

• Wildcat discovery technologies inc
• Medtronic Inc

Inventors

• Li Bin
• Caldwell Marissa

Classifications

• H01M10/0565 Primary

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• C08J3/09

  in organic liquids · CPC title

• H01B1/12

  organic substances {(organic macromolecular compounds or compositions C08)} · CPC title

• C08J5/2256

  based on macromolecular compounds obtained by reactions other than those involving carbon-to-carbon bonds, e.g. obtained by polycondensation · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title