Salts based on oligoether sulfate have been synthesized. Two families of lithium salt were synthesized, mono and disulfate. The results, in term of ionic conductivities, thermal behaviour, viscosity, transference number and electrochemical stability are reported. These salts have sufficient thermal and electrochemical stabilities and, in addition, they have a cationic transference number close to unity. The influence of alkaline cation was evaluated on conductivity and thermal stability measurements. (c) 2005 Elsevier Ltd. All rights reserved.