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Chelating Anion-Mediated Solvation Structures for Rechargeable Magnesium Batteries.

Ming Pan1, Yukun Sun1, Yazhen Zhao1

  • 1School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai, China.

Angewandte Chemie (International Ed. in English)
|April 1, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel magnesium salt with a chelating anion that improves rechargeable magnesium battery performance by optimizing ion solvation and forming a stable solid electrolyte interphase (SEI). This significantly lowers the voltage required for magnesium plating and stripping.

Keywords:
chelating anionsrechargeable magnesium batteriessolid electrolyte interphasesolvation structure

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Battery Technology

Background:

  • Regulating cation solvation structures in electrolytes is crucial for rechargeable metal batteries.
  • Existing solvents and additives for magnesium metal batteries are limited.
  • Developing new magnesium salts is essential for advancing battery performance.

Purpose of the Study:

  • To propose a novel magnesium salt, MgEDTF, with a chelating anion to modulate Mg2+ solvation.
  • To investigate the impact of this chelating anion on the solid electrolyte interphase (SEI) formation.
  • To explore the synergistic effects of halide additives on Mg2+ solvation and SEI properties.

Main Methods:

  • Synthesis and characterization of magnesium (1R,2R)-1,2-diphenylethane-1,2-diylbis(trifluoromethylsulfonylamide) (MgEDTF).
  • Electrochemical studies including Mg plating/stripping overpotential measurements.
  • Spectroscopic analysis to elucidate solvation structures and SEI composition.

Main Results:

  • MgEDTF forms an unsaturated [Mg2+-(EDTF2-)-(DME)] complex, distinct from conventional structures.
  • This complex facilitates anion-derived SEI formation, reducing Mg plating/stripping overpotential from 2.0 to 0.24 V.
  • Trace halide additives further optimize solvation and SEI, reducing overpotential below 0.20 V.

Conclusions:

  • Chelating anion-mediated solvation is a feasible strategy for rechargeable magnesium metal batteries.
  • MgEDTF and synergistic halide additives offer a novel approach to enhance battery performance.
  • This work provides a new pathway for solvation structure modulation in various metal-based battery systems.