Establishing a Stable Anode–Electrolyte Interface in Mg Batteries by Electrolyte Additive

Simple magnesium salts with high electrochemical and chemical stability adequate ionic conductivity represent a new-generation electrolyte for (Mg) batteries. Similar to other Mg electrolytes, the simple-salt also suffers from charge-transfer resistance on surface due adsorbed species in solution. In current study, we built model cell system Mg[B(hfip)4]2/DME Chevrel phase Mo6S8 cathode, demonstrate effect of such anode–electrolyte interfacial properties full-cell performance. It was found that required additional activation cycles achieve its maximal capacity. The process is mainly attributed conditioning interface, which could be boosted by introducing an additive amount Mg(BH4)2 electrolyte. Electrochemical spectroscopic analyses revealed helps remove native oxide layer promotes formation solid interphase Mg. As result, full additive-containing delivered stable capacity second cycle onward. Further battery tests showed reversible cycling 600 excellent rate capability, indicating good compatibility additive. study not only provides fundamental insights into phenomena batteries but highlights facile tunability electrolytes.