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<p>Magnesium-sulfur (Mg-S) batteries offer excellent energy density, safety, and a cost-effective energy storage system. Realizing Mg-S batteries requires bypassing significant challenges like electrolyte compatibility with electrophilic sulfur and Mg metal and polysulfide shuttling. The present work probes the role of 2-ethylhexylamine (EHA) in modifying the physiochemical properties of solid polymer electrolytes (SPEs) based on polyvinyl alcohol (PVA), silicon dioxide (SiO<sub>2</sub>), and magnesium triflate (MgTIF). The introduction of EHA increases the conductivity to approximately 10<sup>−7</sup> S/cm at room temperature, reduces the magnesium stripping/plating overpotential, and improves the interfacial electrode/electrolyte kinetics; further, the optimum concentration (<i>y</i> = 3000 μl) of PVST_<sub>y</sub>EHA shows a high ionic transference number <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2024_14066_Article_IEq1.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="100" /> </InlineMediaObject> <EquationSource Format="TEX">\(({t}_{{mg}^{2+}}=0.88)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <msub> <mi>t</mi> <msup> <mrow> <mi mathvariant="italic">mg</mi> </mrow> <mrow> <mn>2</mn> <mo>+</mo> </mrow> </msup> </msub> <mo>=</mo> <mn>0.88</mn> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> (where PVST is an abbreviation for compound composed of (PVA, SiO<sub>2</sub>, MgTIF)), there is minimal overpotential over 100&#xa0;h. Based on optimum concentration (<i>y</i> = 3000&#xa0;μl), the Mg-S battery exhibits a high initial discharge-specific capacity in the first cycle up to 1837 mAhg<sup>−1</sup>, and over six cycles, it maintained a reversible capacity of 376 mAhg<sup>−1</sup>. The present article attempts to overcome some obstacles that prohibit the realization of Mg-S batteries.</p>

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2-ethylhexylamine additive boosts the transport properties of PVA-based polymer electrolyte for quasi-solid-state magnesium batteries

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  • 发表日期：

    2025年1月8日

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  • S. Y. Ibrahim,
  • S. Abouelhassan,
  • E. Sheha

摘要

Magnesium-sulfur (Mg-S) batteries offer excellent energy density, safety, and a cost-effective energy storage system. Realizing Mg-S batteries requires bypassing significant challenges like electrolyte compatibility with electrophilic sulfur and Mg metal and polysulfide shuttling. The present work probes the role of 2-ethylhexylamine (EHA) in modifying the physiochemical properties of solid polymer electrolytes (SPEs) based on polyvinyl alcohol (PVA), silicon dioxide (SiO2), and magnesium triflate (MgTIF). The introduction of EHA increases the conductivity to approximately 10−7 S/cm at room temperature, reduces the magnesium stripping/plating overpotential, and improves the interfacial electrode/electrolyte kinetics; further, the optimum concentration (y = 3000 μl) of PVST_yEHA shows a high ionic transference number \(({t}_{{mg}^{2+}}=0.88)\) ( t mg 2 + = 0.88 ) (where PVST is an abbreviation for compound composed of (PVA, SiO2, MgTIF)), there is minimal overpotential over 100 h. Based on optimum concentration (y = 3000 μl), the Mg-S battery exhibits a high initial discharge-specific capacity in the first cycle up to 1837 mAhg−1, and over six cycles, it maintained a reversible capacity of 376 mAhg−1. The present article attempts to overcome some obstacles that prohibit the realization of Mg-S batteries.