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Performance boost for primary magnesium cells using iron complexing agents as electrolyte additives.

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Aqueous magnesium (Mg) batteries can now achieve better performance. Adding specific agents to the electrolyte prevents iron impurities from corroding the Mg anode, enhancing battery stability and efficiency.

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Area of Science:

  • Electrochemistry
  • Materials Science

Background:

  • Aqueous Mg batteries offer advantages like raw material availability and high power density.
  • Anode self-corrosion due to iron (Fe) impurity redeposition limits Mg battery capacity and performance.
  • This parasitic reaction creates active sites on the anode, further degrading battery function.

Purpose of the Study:

  • To investigate methods for preventing anode self-corrosion in aqueous Mg batteries.
  • To enhance the stability and performance of Mg battery anodes by controlling impurity redeposition.
  • To identify electrolyte additives that mitigate detrimental effects of Fe impurities.

Main Methods:

  • Addition of Fe3+-complexing agents (Tiron, salicylate) to the aqueous electrolyte.
  • Electrochemical analysis to evaluate anode corrosion and battery performance.
  • Investigation of complexation stability with both Fe3+ and Mg2+ ions.

Main Results:

  • Fe3+-complexing agents effectively prevented Fe redeposition and anode self-corrosion.
  • The addition of Tiron or salicylate significantly boosted Mg battery performance.
  • Complexing agents that also form moderately stable Mg2+ complexes prevented Mg(OH)2 fouling.
  • Improved operating voltage and utilization efficiency were observed.

Conclusions:

  • Fe3+-complexing agents are effective in preventing anode self-corrosion in aqueous Mg batteries.
  • Careful selection of complexing agents is crucial to balance Fe3+ sequestration and Mg2+ solubility.
  • This strategy offers a viable route to enhance the practical application of Mg battery technology.