Ionic conducting material containing an oligoether sulphate

1. An ion-conducting material comprising at least one ionic compound dissolved in a solvating polymer, wherein:

the ionic compound is a mixture of a lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and of at least one lithium oligoether sulfate selected from the group consisting of lithium oligoether monosulfates corresponding to the formula R—[O—CH 2 —CH 2 )] n —O—SO 3 − Li + (I) in which R is a group C m H 2m+1 with 1≦m≦4 and 2≦n≦17, and lithium oligoether disulfates corresponding to the formula Li + O − SO 2 —O—CH 2 —[CH 2 —O—CH 2 ] p —CH 2 —O—SO 2 —O − Li + (II) in which 3≦p≦45,

the overall ratio O t /Li t is less than or equal to 40, O t representing the total number of O atoms provided by the solvating polymer and by the oligoether, and

the LiTFSI content is such that the ratio O t /LiTFSI is greater than or equal to 20.

2. The ion-conducting material as claimed in claim 1 , wherein the solvating polymer is selected from the group consisting of ethylene oxide homopolymers and copolymers, propylene oxide homopolymers and copolymers, and dioxolane homopolymers and copolymers.

3. The ion-conducting material as claimed in claim 1 , wherein the solvating polymer is chosen from copolymers of ethylene oxide and of a crosslinkable comonomer.

4. The ion-conducting material as claimed in claim 1 , wherein the solvating polymer is chosen from poly(oxyethylenes) with a molar mass of from 100 000 g/mol to 5×10 6 g/mol.

5. The ion-conducting material as claimed in claim 1 , further comprising a plasticizer chosen from polar aprotic liquid solvents, the amount of liquid solvent being less than 30% by weight.

6. The ion-conducting material as claimed in claim 1 , wherein the ionic compound is a mixture of LiTFSI and of an oligoether monosulfate of formula (I) in which R is a methyl group and n≦12.

7. The ion-conducting material as claimed in claim 1 , wherein the ionic compound is a mixture of LiTFSI and of an oligoether disulfate of formula (II) in which p≦12.

8. The ion-conducting material as claimed in claim 1 , further comprising at least one additive selected from the group consisting of mineral fillers, lithium salts, organic fillers of cellulose type and flame retardants.

9. A solid polymeric electrolyte comprising a membrane of ion-conducting material as claimed in claim 1 .

10. A composite electrode comprising an ion-conducting material as claimed in claim 1 .

11. An electrochemical cell comprising two electrodes separated by an electrolyte, wherein the electrolyte comprises an ion-conducting material as claimed in claim 1 .

12. An electrochemical cell comprising two electrodes separated by an electrolyte, wherein at least one of the electrodes is a composite electrode comprising a material as claimed in claim 1 .

13. A lithium electrochemical generator, comprising a negative electrode and a positive electrode separated by a solid polymeric electrolyte, wherein the electrolyte comprises an ion-conducting material as claimed in claim 1 .

14. The electrochemical generator as claimed in claim 11 , wherein at least one of the electrodes is a composite electrode comprising a material as claimed in claim 1 , as binder.

15. An electrochromic system, in which the electrolyte and/or the binder for a composite electrode comprises an ion-conducting material as claimed in claim 1 .

16. A light-modulating system, in which the electrolyte and/or the binder for a composite electrode comprises an ion-conducting material as claimed in claim 1 .

17. A selective membrane comprising an ion-conducting material as claimed in claim 1 .

18. A reference membrane for a membrane sensor; comprising an ion-conducting material as claimed in claim 1 .

19. An ion-conducting material comprising

a solvating polymer;

a lithium bis(trifluoromethanesulfonyl)imide (LiTFSI); and

at least one lithium oligoether sulfate selected from the group consisting of

(a) lithium oligoether monosulfates corresponding to the formula R—[O—CH 2 —CH 2 )] n —O—SO 3 − Li + (I) in which R is a group C m H 2m+1 with 1≦m≦4 and 2≦n≦17, and

(b) lithium oligoether disulfates corresponding to the formula Li + O − SO 2 —O—CH 2 —[CH 2 —O—CH 2 ] p —CH 2 —O—SO 2 —O − Li + (II) in which 3≦p≦45,

wherein the overall ratio O t /Li t is less than or equal to 40, where O t represents the total number of O atoms provided by the solvating polymer and by the oligoether and Li t represents the total number of Li atoms, and

wherein the LiTFSI content is such that the ratio O t /LiTFSI is greater than or equal to 20.