Patent ID: 7960060

Claim:
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.