The invention relates to improved hydrocarbon polymer-based alkaline single ion conductors with very high conductivity in aprotic media and methods for preparing the same. The methods for preparing said alkaline single ion conductors comprise at least the following steps: a) providing a hydrocarbon oligomer or polymer with immobilized acidic substituent groups in its alkaline ion form and b) solvating the hydrocarbon oligomer or polymer of step a) in an aprotic polar solvent to obtain a solvated product wherein the molar ratio of solvent/alkaline cation is in the range from 1:1 to 10.000:1 and which solvated product has a conductivity of at least 10 -5 S/cm at room temperature. In a preferred embodiment, the hydrocarbon oligomer or polymer is a polyarylene compound comprising one or more structural elements of the general formula I €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ -[-X-Ar(WA) n -Y-] m -, wherein m is an integer from 1 to 1.000.000, X and Y, which are identical or different from each other, each represent a bridging group which may be an electron-acceptor or electron-donor group or neither, and Ar represents an aromatic or heteroaromatic ring system with 5-18 ring atoms and with W representing an anion of an acidic substituent group selected from a sulfonic acid group, sulfamide group, a phosphonic acid group, or a carboxy group, A representing an alkali cation, and n being between 0.1 and 4.
