Magnesophilic Cu (110) facet enables highly reversible Mg stripping/plating

Abstract

The rechargeable magnesium batteries (RMBs) present compelling alternatives to lithium-ion batteries (LIBs), offering not only high capacity but also the advantage of free of dendrite formation of magnesium (Mg) anode. However, challenges arise from the instability in Mg deposition under extreme high current density conditions. Here, a facile chemical treatment with sodium formate (HCOONa) is reported for obtaining oxidation-resistant and magnesiophilic surface-reconfigured Cu (110) facets (SF-Cu) composite magnesium anodes. The Mg-plated SF-Cu (Mg@SF-Cu) electrodes exhibit excellent cyclic stability of over 2000 h and high coulombic efficiency of 99.0 % during Mg stripping/plating processes. This work demonstrates the feasibility of the facet modulated of Cu collectors as Mg deposition carriers to enhance the electrochemical reversibility of RMBs.