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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Interfacial Reconstruction Toward Reversible Mg Anode in Conventional Electrolytes.

Caiyun Wang1, Huiqin Huang1, Xingxing Wu1

  • 1School of Materials Science and Engineering, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou, Zhejiang 310027, China.

ACS Applied Materials & Interfaces
|October 25, 2023
PubMed
Summary

A novel LiI treatment enhances rechargeable magnesium batteries by improving Mg metal anode performance. This method reduces passivation, boosting energy storage capacity and enabling safer, sustainable battery development.

Keywords:
Interfacial reconstructionMg metal anodeMg(TFSI)2-DME electrolytesRechargeable magnesium batteriesSEI

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Rechargeable magnesium batteries offer sustainable and safe energy storage.
  • Magnesium (Mg) metal anodes suffer from passivation in conventional electrolytes, limiting performance.
  • Developing stable interfaces for Mg anodes is crucial for advanced batteries.

Purpose of the Study:

  • To develop a facile method for reconstructing the Mg metal anode-electrolyte interphase.
  • To improve the plating/stripping behavior of Mg anodes.
  • To enhance the performance of Mg//Mo6S8 rechargeable batteries.

Main Methods:

  • Treatment of Mg metal anode with a lithium iodide (LiI) solution.
  • Characterization of the reconstructed interphase layer.
  • Electrochemical testing of Mg//Mo6S8 full cells.

Main Results:

  • LiI treatment converted the passivation film to an iodine-rich solid electrolyte interphase (SEI).
  • The new SEI facilitated rapid Mg2+ migration, reducing anode overpotential from 2 V to 0.4 V.
  • Li+ shuttling from LiI promoted Mg2+ co-intercalation at the cathode.
  • The Mg//Mo6S8 full cell demonstrated reduced voltage hysteresis (0.1 V) and enhanced specific capacity (80.8 mAh g-1).

Conclusions:

  • A maneuverable anode treatment effectively creates a passivation-resistant interphase for Mg metal anodes.
  • The LiI treatment significantly improves Mg anode plating/stripping and overall battery performance.
  • This approach offers insights for developing high-performance, sustainable magnesium batteries.