Several recent reports indicate the importance glyme solvents for the field of secondary Mg batteries. deviating from the more commonly used, safety problematic THF. Complex electrolyte solutions based on reactions of MgCl2 with different aluminum-based Lewis acid compounds such as Et2AlCl, EtAlCl2, Et3Al and AlCl3 in diglyme or tetraglyme, exhibited a reasonable conductivity based on Mg ions transport and reversible electrochemical Mg deposition, thus showing a better electrochemical performance than parallel electrolyte solutions based on THF. DME solutions containing novel [Mg2(-Cl)2] 2+ cation complexes formed via interactions of MgCl2 with either Mg salts such as Mg(TFSI)2, TFSI = (CF3SO2)2N -, or Al based Lewis acid moieties (such as AlEtCl2 or AlCl3) in DME solutions, exhibited wide electrochemical windows, high ionic conductivity, and promising Mg deposition/dissolution cycling efficiency as compared to THF solutions containing these moieties. A previous work included electrochemical studies of solutions containing Mg(TFSI)2 , MgCl2 and DME solvent, with which a better performance of Mg anodes was shown, compared to parallel THF solutions, in terms of Mg deposition/dissolution cycling efficiency and high anodic stability. .