In Situ Formation of a Bi/Mg‐Based Hybrid Interphase for Highly Reversible Magnesium Metal Anodes

and S cathodes demonstrate excellent capacities, rate capabilities, and long lifespans, highlighting the exceptional electrochemical performance of the Bi-Mg@Mg anode. This study offers a promising strategy for developing highly reversible Mg anodes, paving the way for practical long-cycle MMBs.