Rechargeable magnesium batteries have an appealing volumetric energy density, thanks to the theoretical volumetric capacity of Mg metal anodesaround 3800 mAh cm , which is higher by far compared to that of Li metal anodesaround 2040 mAh cm . Importantly, the main advantage of rechargeable Mg batteries is the possible use of thin Mg or Mg alloys (>90% Mg) foils as anodes. Hence, Mg batteries has advantageous also in terms of cost-effectiveness, thanks to the high abundance of Mg in earth crust. One of the major challenges on the way to develop practical Mg batteries is to exhibit electrolyte solutions in which Mg deposition/dissolution processes are fully reversible (nearly 100%) and yet possessing a wide enough electrochemical window, with an anodic stability > 3V vs. Mg. Several complex electrolyte solutions resulting from reactions of Lewis bases (Grignard reagents like RMgX or MgR2, X = halide, mostly Cl -and R = organic ligand, alkyl or aryl) with Lewis acids (such BX3-nRn or AlX3-nRn, n = 1-3) in ethereal solvents (mostly THF or glymes) demonstrated reversible Mg deposition/dissolution and electrochemical windows wider than 3V. A few of these systems were proven as promising via experiments with rechargeable Mg battery prototypes. The electrodes in such cells were usually Mg foil anodes and Chevrel phase cathodes (mostly the cluster compound MgxMo6S8, 0<x<2). However, Grignard-based electrolytes in ethereal solutions may suffer from low anodic stability and high chemical reactivity because of their strong nucleophilic and basic character. While chlorides containing complex ethereal solutions of the above type demonstrated some advantages in enhancing the reversibility of Mg anodes, they may be corrosive and chemically incompatible with relevant current collectors for cathodes such as aluminum, nickel or stainless (SS) foils. Therefore, developing novel, stable, chlorides-free, less expensive electrolytes that can promote reversible Mg deposition/stripping in ethereal solutions is important for developing practical rechargeable Mg batteries. Thereby, working on new electrolyte solutions for Mg batteries while avoiding limitations related to the cathodes side (including overcoming on the challenge of cost-effective metallic current collectors) is highly important.