Multi-ionic salts and uses thereof

Patent metadata

Field	Value
Publication number	US-10731010-B2
Application number	US-201816002044-A
Country	US
Kind code	B2
Filing date	Jun 7, 2018
Priority date	Jun 7, 2017
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

The invention provides a novel composition comprising a multi-ionic polyoligomeric silsesquioxane and a polyether solvent, optionally with an additional lithium salt. The composition of the invention allows for improved lithium ion transference over lithium salts alone by avoiding the problem of ion aggregation that reduces conductivity in single ion conductors. Also provided is a method for forming such a composition and a liquid electrolyte comprising a multi-ionic polyoligomeric silsesquioxane and a polyether solvent, optionally with an additional lithium salt.

First claim

The invention claimed is:

1. A composition comprising:
a polyether solvent; and
a polyoligomeric silsesquioxane of Formula (I):
[(O 1.5 )Si-L-X] n Y n ,  Formula (I);

wherein n is an even integer;
L is a divalent linking group;
Y is a cationic group selected from the group consisting of Li + , Na + , K + , and Mg 2+ ; and
X is an anionic group.

2. The composition of claim 1 , wherein the polyether solvent is tetraglyme.

3. The composition of claim 1 , wherein n is 8.

4. The composition of claim 1 , wherein L is selected from the group consisting of alkyl, siloxane, heteroatom, and combinations thereof.

5. The composition of claim 1 , wherein L is —OSi(Me) 2 (CH 2 ) 3 —; and wherein the O is bound to the silicon atom of Formula (I).

6. The composition of claim 1 , wherein X is —[NSO 2 CF 3 ] − .

7. The composition of claim 1 , wherein the polyoligomeric silsesquioxane of Formula (I) is a polyoligomeric silsesquioxane of Formula (II):
[(O 1.5 )Si—OSi(Me) 2 (CH 2 ) 3 —NSO 2 CF 3 ] n Li n ,  Formula (II);

wherein n is an even integer selected from the group consisting of 6, 8, 10, and 12.

8. The composition of claim 1 , further comprising an additional lithium salt.

9. The composition of claim 8 , wherein the additional lithium salt is selected from the group consisting of lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, and lithium tetrafluoroborate.

10. The composition of claim 8 , wherein the weight ratio of the additional lithium salt to the polyoligomeric silsesquioxane of Formula (I) is about 80/20.

11. The composition of claim 8 , wherein the ratio of the number ether oxygens in the polyether solvent to the number of Li + ions in the composition is between about 20/1 and about 9/1.

12. A liquid electrolyte comprising arrays of disordered particles of a polyoligomeric silsesquioxane of Formula (I) in a polyether solvent:
[(O 1.5 )Si-L-X] n Li n ,  Formula (I);

wherein in Formula (I), n is an even integer;
L is a divalent linking group; and
X is an anionic group.

13. The liquid electrolyte of claim 12 , further comprising lithium bis(trifluoromethanesulfonyl)imide.

14. The liquid electrolyte of claim 13 , wherein the ratio of the number ether oxygens in the polyether solvent to the number of Li + ions in the polyoligomeric silsesquioxane of Formula (I) and the lithium bis(trifluoromethanesulfonyl)imide is about 17.1/1.

15. The liquid electrolyte of claim 12 , wherein the polyether solvent is tetraglyme.

16. The liquid electrolyte of claim 12 , wherein L is —OSi(Me) 2 (CH 2 ) 3 —;
wherein the O is bound to the silicon atom of Formula (I); and
X is —[NSO 2 CF 3 ] − .

17. A battery comprising the liquid electrolyte of claim 12 .

18. A method for forming a composition, the method comprising:
adding a polyoligomeric silsesquioxane of Formula (I) to a polyether solvent under an inert atmosphere:
[(O 1.5 )Si-L-X] n Li n ,  Formula (I);

wherein in Formula (I), n is an even integer;
L is a divalent linking group; and
X is an anionic group.

19. The method of claim 18 , further comprising the step of adding an additional lithium salt to the polyether solvent.

20. The method of claim 19 , wherein the additional lithium salt is lithium bis(trifluoromethanesulfonyl)imide.

Assignees

• Temple University—Of the Commonwealth System of Higher Education

Inventors

• Wunder Stephanie
• Chinnam Parameswara Rao

Classifications

• C08G77/398 Primary

  containing boron or metal atoms · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0525

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