The electrolytes containing halide-free inorganic magnesium salt Mg(BH4)(2) dissolved in ether solvents have shown reversible Mg deposition-dissolution performance. Herein, we improved the anodic stability of the electrolytes on non-inert stainless-steel electrode by mixing PP14TFSI ionic liquid with tetraglyme (TG) and dimethoxyethane (DME) ether solvents. The effect of mixing ratios and salt concentrations on the electrochemical behavior of the electrolyte were investigated. High anodic stability, good ionic conductivity, excellent cycling efficiency, feasibility of the preparation and good compatibility toward Mo6S8 and TiO2 insertion cathode make the electrolytes promising for the potential application in rechargeable magnesium batteries. (C) The Author(s) 2016. Published by ECS. All rights reserved.