A Passivation-Free Solid Electrolyte Interface Regulated by Magnesium Bromide Additive for Highly Reversible Magnesium Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 36749889.
- Also identified by DOI 10.1021/acs.nanolett.3c00033.
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Abstract
Highly reversible Mg battery chemistry demands a suitable electrolyte formulation highly compatible with currently available electrodes. In general, conventional electrolytes form a passivation layer on the Mg anode, requiring the use of MgCl<sub>2</sub> additives that lead to severe corrosion of cell components and low anodic stability. Herein, for the first time, we conducted a comparative study of a series of Mg halides as potential electrolyte additives in conventional magnesium bis(hexamethyldisilazide)-based electrolytes. A novel electrolyte formulation that includes MgBr<sub>2</sub> showed unprecedented performance in magnesium plating/stripping, with an average Coulombic efficiency of 99.26% over 1000 cycles at 0.5 mA/cm<sup>2</sup> and 0.5 mAh/cm<sup>2</sup>. Further analysis revealed the <i>in situ</i> formation of a robust Mg anode-electrolyte interface, which leads to dendrite-free Mg deposition and stable cycling performance in a Mg-Mo<sub>6</sub>S<sub>8</sub> battery over 100 cycles. This study demonstrates the rational formulation of a novel MgBr<sub>2</sub>-based electrolyte with high anodic stability of 3.1 V for promising future applications.