The quest for a suitable electrolyte formulation is pivotal to the success of rechargeable magnesium batteries. A simple conventional electrolyte having high compatibility with magnesium anode and cathode material is in great demand. Herein, we report a simple yet effective electrolyte formulation, comprising magnesium triflate (Mg(OTf)₂) and magnesium chloride in monoglyme, that can enable highly reversible, conditioning-free, and homogeneous magnesium deposition. Galvanostatic Mg plating/stripping demonstrates an average Coulombic efficiency of 99.4% over 1,000 cycles. The cells show excellent performance at current densities up to 3 mA cm⁻² and areal capacities up to 5 mAh cm⁻². Post mortem analysis unveils the formation of a robust solid electrolyte interphase, which leads to improved kinetics at the magnesium electrode. A prototype Mg battery with Mo₆S₈ cathode demonstrates stable cycling performance over 100 cycles. This study shows that rational design of Mg(OTf)₂-based electrolytes is a promising direction toward the realization of high-performance magnesium batteries.

对合适的电解质配方的追求对于可再充电镁电池的成功至关重要。非常需要与镁阳极和阴极材料具有高相容性的简单的常规电解质。本文中，我们报告了一种简单而有效的电解质配方，该配方包含三氟甲磺酸镁（Mg（OTf）₂）和一甘醇二甲醚中的氯化镁，可以实现高度可逆，无调理和均匀的镁沉积。恒电流镁镀层/剥离表明在1,000个循环中平均库仑效率为99.4％。电池在高达3 mA cm ^-2的电流密度下和在高达5 mAh cm ^-2的面积容量下均表现出出色的性能。验尸分析揭示了坚固的固体电解质中间相的形成，这导致了镁电极动力学的改善。带有Mo ₆ S ₈阴极的Mg原型电池在100个循环中显示出稳定的循环性能。这项研究表明，基于Mg（OTf）₂的电解质的合理设计是实现高性能镁电池的一个有希望的方向。