Patent ID: 8802301

Claim:
An ionic liquid for an electrolyte of a lithium ion battery, comprising a binary vitreous eutectic mixture represented by the formula A x B y , wherein: A is a salt chosen from a lithium fluoroalkylsulfonimide or a lithium fluoroarylsulfonimide, wherein the lithium fluoroalkylsulfonimide and the lithium fluoroarylsulfonimide are individually represented by the formula: wherein R 1 is chosen from F, CF 3 , C 2 F 5 , C 4 F 9 , an aromatic group, or a fluorinated aromatic group and wherein R 2 is chosen from F, C 4 F 9 , an aromatic group, or a fluorinated aromatic group; B is a solvent chosen from an alkylsulfonamide or an arylsulfonamide; x and y are the mole fractions of A and B, respectively; a molar ratio of A to B ranges from 1:0.2 to 1:10; and the eutectic mixture is a liquid at ambient temperature and has a glass transition temperature of less than −50° C.