TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: (Disclosed) A pyrrolidinium sulfonate compound is prepared by reacting by heating suitable sulfonylester precursor compound and acetonitrile, adding methylpyrrolidine dropwise, stirring overnight, reducing volume to half by removing acetonitrile, adding dichloromethane (CH2Cl2) to yield 1:1 mixture of CH2Cl2 and reaction mixture, filtering using silica gel, washing silica gel with CH2CI2 and acetonitrile, removing solvent by rotary evaporator, drying residue overnight in oil pump vacuum. Preferred Processes: Group -SO3- is -O-S(O)2- by reacting compounds of formula XR1R2R3 with compounds of formula R4-S(O)2-O-(OH2)-O-S(O)2-R5. Preferred Components: Electrolyte composition contains organic aprotic solvent selected from (a) cyclic and acyclic organic carbonates, which may be partly halogenated; (b) di-1-10C-alkylethers, which may be partly halogenated; (c) di-(1-4C-alkyl)(2-6C-alkylene ethers) and polyethers, which may be partly halogenated; (d) cyclic ethers, which may be partly halogenated; (e) cyclic and acyclic acetals and ketals, which may be partly halogenated; (f) orthocarboxylic acids esters, which may be partly halogenated; (g) cyclic and acyclic esters of carboxylic acids, which may be partly halogenated; (h) cyclic and acyclic sulfones, which may be partly halogenated, and/or (i) cyclic and acyclic nitriles and dinitriles, which may be partly halogenated. Preferred Definitions:    X=N;    -SO3-=-O-S(O)2-;    n=1-4; and    R3-R5=reactive group selected from -C=C- double bond, -CC- triple bond, cyclopropyl, cyclopropylene, and/or epoxy.    SPECIFIC COMPOUNDS - 2 Compounds (I) are disclosed, e.g. 2-(vinylsulfonyloxy)ethyl-methyl-pyrrolidinium vinylsulfonate (1) and 2-(methylsulfonyloxy)ethyl-methyl-pyrrolidinium methylsulfonate.    EXAMPLE - Ethanediol-bis-vinylsulfonylester (8 g) and acetonitrile (200 ml) were filled into a glass flask and heated under stirring to 70 degrees C. Methylpyrrolidine (31 g) was added within 60 minutes dropwise. Reaction mixture was stirred overnight at 70 degrees C and reduced to half of its volume by removing acetonitrile. Dichloromethane (CH2Cl2) was added to yield 1:1 mixture of CH2Cl2 and reaction mixture. This mixture was filtered using silica gel. The silica gel was washed with CH2CI2 and acetonitrile. The solvent was removed from the filtrate by rotary evaporator, and the residue was dried overnight in oil pump vacuum to afford 2-(vinylsulfonyloxy)ethyl-methyl-pyrrolidinium vinylsulfonate (70 g) as yellow viscous oil.