NOVELTY - Imidosulfuryl compounds (I) are new.    USE - (I) are useful: as molten salt, solvent, ionic liquid, electrolyte and electrochemical device; and in a battery, preferably lithium-ion battery. (IX) is useful as an electrolyte (all claimed). (I) is useful: as e.g. lubricants, stationary phase for chromatography, matrices for mass spectrometry, supports for the immobilization of enzymes, liquid crystals and materials for embalming and tissue preservation; and in separation technologies, dry cleaning, metal extraction, solar panel, ion propulsion, fuel cells, electro-optics, drug delivery and biomass processing.    ADVANTAGE - (I) can be simply, easily and rapidly prepared at low costs. The process is efficient to prepare (I).    DETAILED DESCRIPTION - Imidosulfuryl compounds (I) of formula (N-(S(O)2-R1)2) (Q+) are new.    R1 = F, Cl, -N(R5)2 or CN;    Q+ = 20 heterocyclic compounds e.g. of formula (1a-5a) (all substituted with 1-3 substituents of -NO2, CN, OH, CF3 -COR4, -SH, -OMe, -OCH2Ph, -SMe, -SPh, -OCH2Ph, -COOH, -COOR4, -NH2, 2-20C alkenyl, 1-20C alkoxy, 1-20C alkyl, 2-20C alkynyl, 6-20C aralkyl, 6-12C aryl, 3-8C cycloalkyl, 1-20C aminoalkyl, 1-6C hydroxyalkyl, 2-12C heteroaryl, 1-12C vinyl, 4-20C alkylvinyl, 4-20C vinylalkyl or 3-20C expoxyalkyl);    R2-R5 = H, 1-20C alkyl, 3-12C cycloalkyl, 1-12C heterocyclyl, 2-20C alkenyl, 2-20C alkynyl, 6-12C aryl, 6-20C aralkyl, 6-20C alkylaryl, 1-12C heteroaryl (all optionally substituted with 1-3 substituents of F, Cl, Br, I, OH, 1-6C alkoxy, 1-6C hydroxy alkyl, NO2, CN, CF3, SO3-, CnF2n+1, 1-12C alkyl, 6-12C aryl, CnH2n+1, Ph2P(O)-, Ph2P-, Me2P(O)-, Me2P, Ph2P(S), Me2P(S), Ph3P=N-, Me3P=N-, C6H5CpH2p, CpH2p+1C6H4, CpH2p+1C6H4CnH2n, CH2=CHCpH2p-, CH2=CHC6H5-, CH2=CHC6H4CpH2p+1, oxirane compound of formula (6a) or CH2=CHCpH2p+1C6H4) or an effective protecting group for an amino group; and    n, p = 1-48.    Provided that (I) is different than 1-methyl-1-propylpyrrolidinium imidosulfuryl fluoride. INDEPENDENT CLAIMS are included for:    (1) a molten salt comprising (I);    (2) an ionic liquid comprising (I);    (3) an electrolyte comprising (I);    (4) an electrochemical device comprising (I),    (5) a battery comprising an anode, a cathode and (I);    (6) a process of using (I) comprising contacting (I) with electrodes and using (I) as an electrolyte;    (7) a process of using (I) comprising introducing (I) in the manufacture of a proton exchange membrane;    (8) a process of using a compound comprising mixing (I) with lithium compound (IX) of formula (Li+D-) (where D is CF3SO3-, (FSO2)2N-, (CF3SO2)2N-, (CF3SO2)3C-, PF6-, CF3COO-, AsF6-, CH3COO-, NO3-, BF4-, ClO4-, (C8H16SO2)2N- or C3H3N2-) to obtain a mixture and using the mixture as an electrolyte;    (9) the preparation of (I); and    (10) the lithium compound (IX).