Electrolytes for electrochemical generator

Patent metadata

Field	Value
Publication number	US-11613520-B2
Application number	US-202016751856-A
Country	US
Kind code	B2
Filing date	Jan 24, 2020
Priority date	Jan 29, 2019
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

The present invention relates to thermotropic ionic liquid crystal molecules of general formula (I)

With E 1 and E 2 , which may be identical or different, representing, independently of one another, a linear, saturated and unsubstituted C 10 to C 14 hydrocarbon-based radical, A x− representing a sulfonate anion or a sulfonylimide anion of formula —SO 2 —N − —SO 2 C y F 2y+1 with y being an integer ranging from 0 to 2 and C x+ a sodium, lithium or potassium ion, most particularly advantageous for their conductivity performance qualities as an electrolyte in particular for lithium batteries.

First claim

The invention claimed is:

1. A process for preparing an electrochemical system comprising:
preparing an electrolyte comprising thermotropic ionic liquid crystal molecules according to formula (I):

wherein:
E 1 and E 2 , which may be identical or different, represent, independently of one another, a linear, saturated, and unsubstituted C 11 to C 13 alkyl radical,
A x− represents a sulfonate anion or a sulfonylimide anion —SO 2 —N − —SO 2 CF 3 ,
C x+ is an Li + cation, and
wherein thermotropic ionic liquid crystal molecules are in a mesomorphic state; and

employing said electrolyte in the electrochemical system.

2. The method according to claim 1 , wherein E 1 and E 2 are identical.

3. The method according to claim 1 , wherein -A x− is the sulfonate anion.

4. The method according to claim 1 , wherein the thermotropic ionic liquid crystal molecules have a structure:

5. The method according to claim 1 , wherein E 1 and E 2 are dodecyl radicals.

6. An electrolyte comprising thermotropic ionic liquid crystal molecules having formula (I):

wherein:
E 1 and E 2 , which may be identical or different, represent, independently of one another, a linear, saturated, and unsubstituted C 11 to C 13 alkyl radical,
A x− represents a sulfonate anion or a sulfonylimide anion —SO 2 —N − —SO 2 CF 3 ,
C x+ is an Li + cation, and
wherein thermotropic ionic liquid crystal molecules are in a mesomorphic state.

7. The electrolyte according to claim 6 , wherein the electrolyte has a viscosity of greater than or equal to 10 mPa.s at a temperature of between −60° C. and 300° C.

8. The electrolyte according to claim 6 , wherein the electrolyte has an ion conductivity at 20° C. of greater than or equal to 10 −7 S.cm −1 .

9. The electrolyte according to claim 6 , wherein the electrolyte has an ionic conductivity of greater than 10 −4 S.cm −1 at 100° C. and an ionic conductivity at 150° C. of greater than or equal to 10 −3 S.cm −1 .

10. An electrochemical system comprising the electrolyte according to claim 6 and an electrode.

11. The electrochemical system according to claim 10 , wherein the electrochemical system is a battery.

12. The electrochemical system according to claim 11 , wherein the electrochemical system is a lithium battery.

13. The electrochemical system according to claim 10 , wherein the electrolyte is impregnated in a porous separator.

14. A porous separator impregnated with the electrolyte according to claim 6 .

Assignees

• Commissariat Energie Atomique

Inventors

• Picard Lionel
• Bernard Laurent
• Lyonnard Sandrine
• Mendil Hakima

Classifications

• H01M10/052

  Li-accumulators · CPC title

• C07C311/48

  having nitrogen atoms of sulfonamide groups further bound to another hetero atom · CPC title

• C07C309/47 Primary

  having at least one of the sulfo groups bound to a carbon atom of a six-membered aromatic ring being part of a condensed ring system · CPC title

• H01M10/056

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title

• C07C307/02

  Monoamides of sulfuric acids or esters thereof, e.g. sulfamic acids · CPC title