Chemical and electrochemical characterization of two new Li salts which exhibit high conductivity in both liquid and polymer solvent systems are presented. When dissolved in non-aqueous solvents such as tetrahydrofuran LiN(SO2CF3)2, Li bis-(trifluoromethanesulfonyl)imide and LiC(SO2CF3)3, Li tris-(trifluoromethanesulfonyl)methide are the two most highly conductive organic anion-based Li salts known. Cyclic voltammetry studies show both salts to be electrochemically stable beyond 4 V vs Li. They are also stable indefinitely at elevated temperatures, eg 100-degrees-C, unlike the large class of inorganic Li salts based on perhalogenated transition metal and main group ions.
