In this work the synthesis and structural and electrical characterisation are described regarding new polymeric electrolytes for magnesium batteries on the basis of polyether blends [poly(ethylene oxide) (PEO), poly(propylene oxide) (PPO) and poly(phosphazene) (PPz)]. For the microstructural characterisation we used X-ray spectroscopy, Fourier-transform IR spectroscopy (FTIR), as well as differential scanning calorimetry (DSC). Electrical characterisation was conducted by means of complex impedance spectroscopy. The results obtained confirm the formation of complex magnesium salts by solvation of the oxygen of the polyether chain with the magnesium ion from the magnesium salt [magnesium trifluoromethanesulphonate, (CF3SO3)(2)Mg]. As a consequence high conductivities are obtained at temperatures around 100 degrees C. This conductivity is significantly enhanced when the polymers are plasticized.