Effects of current collectors on the electrochemical performance of electrolytes for rechargeable magnesium batteries

Abstract

The effects of metal (platinum, nickel, stainless steel (SS), copper and aluminum) and carbon (carbon fiber, graphite foil and carbon cloth) current collectors on the anodic stability and magnesium deposition-dissolution of the electrolytes (Mg(AlCl 2BuEt) 2/THF and (PhMgCl) 2-AlCl 3/THF) for rechargeable magnesium batteries were studied by cyclic voltammetry and constant current deposition-dissolution. Nickel, SS, copper and aluminum current collectors corrode on charging. Nickel and SS exhibit higher stability than the other metals, and can be used as the current collector for the cathode material with a charging voltage under 2.1 V (vs Mg/Mg 2+). Copper is suitable for the cathode with a charging voltage under 1.8 V (vs Mg/Mg 2+). Furthermore, carbon current collectors have higher anodic stability than metals. Carbon cloth is appropriate for the cathode material with a charging voltage under 2.25 V (vs Mg/Mg 2+) in Mg(AlCl 2BuEt) 2/THF and 2.95 V (vs Mg/Mg 2+) in (PhMgCl) 2-AlCl 3/THF. © Editorial office of Acta Physico-Chimica Sinica.