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Magnesium (Mg) anodes typically experience electrochemical passivation and dendrite formation with conventional electrolytes during cell storage and operation, which results in a rapid decline in cyclability and shortened lifespans. These concerns supposedly relate to the features of the Mg/electrolyte interface. Herein, we report that Mg(BH4)2-rich artificial hybrid interphase (AHI) fabricated on Mg by a simple cation replacement method effectively ensures electrochemical activity and nondendritic interface. This can be attributed to the synergy of fast Mg2+ transfer, high electronically insulating and structural stability, etc., of AHI, as revealed by experimental and computational findings. The symmetric cell presents a low-voltage polarization of 230 mV and prolonged cycling life of over 1300 h at 1 mA cm–2 in 0.5 M Mgbis(trifluoromethanesulfonyl)imide (TFSI)2/dimethoxyethane (DME) electrolyte. Meanwhile, the full cells paired with a Mo6S8 cathode at various rates with desirable stability are also achieved. Our work provides further insight into the design of a versatile non-MgCl2 artificial layer specialized for rechargeable Mg batteries.
Zhang et al. (Sun,) studied this question.