NOVELTY - Ionic liquid (A) comprises a sulfoniumdicyanamide compound (I).    USE - (A) is useful as solvent or solvent additives, as phase transfer catalyst in multi-phase reaction systems and as surface-active substance or softeners, as extracting agents in material separation process. (A) is useful in electro-chemical applications, batteries, sensors, condensors, capacitors, solar cells and coloring material solar cells (all claimed).    ADVANTAGE - (A) provides improved electro-chemical properties, which makes technique simple.    DETAILED DESCRIPTION - Ionic liquid (A) comprises a sulfoniumdicyanamide compound (I) of formula (-S+(R2)(R1)(R3)) (Ntriple bondC-N--Ctriple bondN).    R1-R3 = H, aliphatic 1-20C hydrocarbon (additionally exhibiting hetero atoms of N, S or O, and unsaturated, one or more conjugated or isolated double/triple bonds and one or more functional groups such as amino, carboxyl, acyl or OH), 3-20C cyclo-aliphatic hydrocarbon (where the cyclic residue of ring exhibits hetero atoms of N, S or O, unsaturated, one or more conjugated or isolated double/triple bonds), aromatic and araliphatic groups with 5-22C atoms in the aromatic core (which exhibits 1-4 hetero atoms of N, S or O, and 1-10C hydrocarbon residue), oligoether group (II) of formula (-((CH2-CHR5)x-O)y-R4);    x, y = 1-250;    R4 = H, aliphatic 1-20C hydrocarbon (additionally exhibiting hetero atoms of N, S or O, and unsaturated, one or more conjugated or isolated double/triple bonds and one or more functional groups such as amino, carboxyl, acyl or OH), 3-20C cyclo-aliphatic hydrocarbon (where the cyclic residue of ring exhibits hetero atoms of N, S or O, unsaturated, one or more conjugated or isolated double/triple bonds) or aromatic and araliphatic groups with 5-22C atoms in the aromatic core (which exhibits 1-4 hetero atoms of N, S or O, and 1-10C hydrocarbon residue); and    R5 = H, methyl, ethyl, propyl or butyl.    INDEPENDENT CLAIMS are also included for:    (1) an electrolyte comprising (A);    (2) the preparation of (A); and    (3) a battery, a sensor, a condenser, a capacitor, a solar cell or a coloring material solar cell, comprising (A).