Magnesium-based batteries possess potential advantages over their lithium counterparts. However, reversible Mg chemistry requires a thermodynamically stable electrolyte at low potential, which is usually achieved with corrosive components and at the expense of stability against oxidation. In lithium-ion batteries the conflict between the cathodic and anodic stabilities of the electrolytes is resolved by forming an anode interphase that shields the electrolyte from being reduced. This strategy cannot be applied to Mg batteries because divalent Mg2+ cannot penetrate such interphases. Here, we engineer an artificial Mg2+-conductive interphase on the Mg anode surface, which successfully decouples the anodic and cathodic requirements for electrolytes and demonstrate highly reversible Mg chemistry in oxidation-resistant electrolytes. The artificial interphase enables the reversible cycling of a Mg/V2O5 full-cell in the water-containing, carbonate-based electrolyte. This approach provides a new avenue not only for Mg but also for other multivalent-cation batteries facing the same problems, taking a step towards their use in energy-storage applications.
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This work was supported by the Laboratory Directed Research and Development (LDRD) programme at the National Renewable Energy Laboratory (NREL). The authors greatly appreciate the constructive suggestions from H. Guthrey and D. H. Kim at NREL. The Alliance for Sustainable Energy, LLC (Alliance), is the manager and operator of NREL. Employees of the Alliance, under contract no. DE-AC36-08GO28308 with the US Department of Energy, authored this work.
The authors declare no competing interests.
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Son, SB., Gao, T., Harvey, S.P. et al. An artificial interphase enables reversible magnesium chemistry in carbonate electrolytes. Nature Chem 10, 532–539 (2018). https://doi.org/10.1038/s41557-018-0019-6
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