Electrochemical Stability of Metal Electrodes for Reversible Magnesium Deposition/Dissolution in Tetrahydrofuran Dissolving Ethylmagnesium Chloride

摘要

There is an urgent need for low-cost and electrochemically stable conductive materials for use as current collectors in the development of commercial magnesium batteries, positiveegative electrode materials, and electrolytes with wide potential windows. In this work, we studied the stability of common metallic electrodes aluminum, copper, and austenitic stainless steel for reversible magnesium deposition/dissolution in tetrahydrofuran using ethylmagnesium chloride and aluminum chloride. The different electrodes used changed both the overpotential of magnesium deposition and the reversibility of Mg deposition/dissolution. Among the metals, copper electrodes gave the lowest overpotential for Mg deposition and high cycling efficiency of Mg deposition/dissolution, larger than 97%.