TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The electrolyte comprises a supporting electrolyte comprising a lithium salt and/or a tetraalkyl ammonium salt. The electrolyte comprises at least one further additive.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I), comprises (a) reacting hydrocarbon compounds of formula (K2) with alcohol compounds of formula (Hal-(CH2)-(CH2)u-OH) (VI), reacting the obtained intermediate halide salt of formula ((K2-(CH2)-(CH2)u-OH)+(Hal)-) (VII) with alkyl sulfate compounds of formula (R12-(CH2)v-SO2-L) (VIII) under acid catalysis (if alkoxy group is leaving group) or in presence of a base (if Cl or F is leaving group) to obtain alkyl sulfate compounds of formula ((K2-(CH2)-(CH2)u-SO3-( CH2)v-R12)+(Hal)-) (IX), and reacting (IX) with a salt of formula ((Kt)+(A)-) (X) in a metathesis reaction (when S1 = (IVa)); (b) reacting (K2) with (1,2)oxathiolane-2,2-dioxide compounds of formula (XI) to obtain sulfate anions of formula (K-(CH2)-(CH2)u-SO3-) (XII), reacting (XII) with alkylating agent of formula (L11-(CH2)v-R12) (XIII) to obtain alkyl sulfate compounds of formula ((K2-(CH2)-(CH2)u-SO3-( CH2)v-R12)+(L11)-) (XIV), and reacting (XIV) with (X) (when S1 = (IVb) and u is 2-5); (c) reacting (K2) with dihalide compounds of formula (Hal-(CH2)-(CH2)u-Hal) (XV), reacting the obtained intermediate dihalide salt of formula ((K2-(CH2)-(CH2)u-Hal)+(Hal)-) (XVI) with an alkali metal sulfite or ammonium sulfite compound and then with an alkyl compound of formula (L11-(CH2)v-R12) (XVII), reacting the obtained alkyl sulfate compound ((K2-(CH2)(CH2)u-SO3-(CH2)v-R12)+(L11)-) (XVIII) optionally with (X).K2 = heterocyclyl moieties of formula (Va)-(Vd), piperazine moieties of formula (Ve) or azaphosphinane moieties of formula (Vf);Hal = Cl, Br or I;L = leaving group, preferably 1-3C alkoxy, Cl or F;Kt = alkali metal cation or H+;L11 = CF3-S(O)2O, C4F9-S(O)2O, (C2F5)2P(O)O, (C4F9)2P(O)O, (alkyl1)2O+, alkyl1-S(O)2O, alkyl1-O-S(O)2O, I or Br; andalkyl1 = 1-4C alkyl. SPECIFIC COMPOUNDS - 33 Compounds (I) are disclosed e.g. 1-(4-(methoxysulfonyl)butyl)-1-methylpyrrolidinium-trifluoromethanesulfonate salt of formula (Ia), 1-(4-(methoxysulfonyl)butyl)-1-methylpyrrolidinium-2,3,7,8-tetraoxo-1,4,6,9-tetraoxa-5-boranuidaspiro(4.4)nonane salt, 1-(3-(methoxysulfonyl)propyl)-1-methylpyrrolidinium-trifluoromethanesulfonate salt, 1-(3-(methoxysulfonyl)propyl)-1-methylpyrrolidinium-2,3,7,8-tetraoxo-1,4,6,9-tetraoxa-5-boranuidaspiro(4.4)nonane, and 1-methyl-1-(3-(2,2,2-trifluoroethoxysulfonyl)propyl)pyrrolidinium-2,3,7,8-tetraoxo-1,4,6,9-tetraoxa-5-boranuidaspiro(4.4)nonane salt.    EXAMPLE - 3-(1-Methylpyrrolidinium-1-yl)-propane-1-sulfonate (6.3 g) was suspended in acetonitrile (10 ml) and methyl triflate (5.6 g) was added to it. Then the reaction mixture was stirred for 3 hours at room temperature. Then potassium tris(pentafluoroethyl)trifluorophosphate (14.7 g) was added and the reaction mixture was worked up to obtain 1-(3-(methoxysulfonyl)-propyl)-1-methylpyrrolidinium-tris(pentafluoroethyl)trifluorophosphate.