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<p>Magnesium batteries in combination with solid polymer electrolytes are currently under investigation for their promising performance and good capabilities in the next-generation battery technology. The present study reports on the development of solid polymer electrolytes for magnesium batteries. Magnesium-ion-conducting solid polymer electrolytes have been prepared by simple solution casting technique using the triblock copolymer Poly(Vinylidene Chloride-co-Acrylonitrile-co-Methylmethacrylate) (PVAM) with various concentrations of magnesium trifluoromethanesulfonate or magnesium triflate (<i>x</i>MgTf<sub>2</sub>) salt (<i>x</i> = 30%, 40%, 50%, and 60%). The electrochemical impedance measurements show the highest ionic conductivity of 2.32 × 10<sup>−4</sup> S cm<sup>−1</sup> at the room temperature of 28&#xa0;°C for the polymer electrolyte having polymer-salt composition, 50 mw% PVAM: 50 mw% MgTf<sub>2</sub>, whereas the pure PVAM electrolyte has a conductivity value of 3.07 × 10<sup>−8</sup> S cm<sup>−1</sup>. X-ray diffraction study reveals the enriched amorphous nature of the polymer electrolyte when MgTf<sub>2</sub> salt is added to the polymer. The polymer electrolyte, 50 mw% PVAM: 50 mw% MgTf<sub>2</sub>, has a high amorphous nature. Fourier transform infrared spectroscopy reveals the functional groups present in the prepared samples. Glass transition temperature (<i>T</i><sub>g</sub>) of all prepared polymer electrolytes has been measured using differential scanning calorimetric technique. Linear sweep voltammetry studies show the electrochemical stability as 3.15&#xa0;V, and the transference number measurements confirm the predominant contribution of Mg<sup>2+</sup> ions in the overall conductivity of the polymer electrolytes. A primary magnesium battery has been constructed using the polymer electrolyte of the highest conductivity (50 mw% PVAM: 50 mw% MgTf<sub>2</sub>), and a stable open circuit voltage of 2.04&#xa0;V has been obtained. Discharge characteristics of the battery are also analyzed, and a light-emitting diode (LED) is allowed to glow continuously by connecting across the two constructed primary magnesium batteries in series.</p>

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Influence of magnesium trifluoromethanesulfonate on triblock copolymer electrolyte based on poly(vinylidene chloride-co-acrylonitrile-co-methylmethacrylate) for solid-state battery applications

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • T. Ponraj,
  • A. Ramalingam,
  • S. Selvasekarapandian

摘要

Magnesium batteries in combination with solid polymer electrolytes are currently under investigation for their promising performance and good capabilities in the next-generation battery technology. The present study reports on the development of solid polymer electrolytes for magnesium batteries. Magnesium-ion-conducting solid polymer electrolytes have been prepared by simple solution casting technique using the triblock copolymer Poly(Vinylidene Chloride-co-Acrylonitrile-co-Methylmethacrylate) (PVAM) with various concentrations of magnesium trifluoromethanesulfonate or magnesium triflate (xMgTf2) salt (x = 30%, 40%, 50%, and 60%). The electrochemical impedance measurements show the highest ionic conductivity of 2.32 × 10−4 S cm−1 at the room temperature of 28 °C for the polymer electrolyte having polymer-salt composition, 50 mw% PVAM: 50 mw% MgTf2, whereas the pure PVAM electrolyte has a conductivity value of 3.07 × 10−8 S cm−1. X-ray diffraction study reveals the enriched amorphous nature of the polymer electrolyte when MgTf2 salt is added to the polymer. The polymer electrolyte, 50 mw% PVAM: 50 mw% MgTf2, has a high amorphous nature. Fourier transform infrared spectroscopy reveals the functional groups present in the prepared samples. Glass transition temperature (Tg) of all prepared polymer electrolytes has been measured using differential scanning calorimetric technique. Linear sweep voltammetry studies show the electrochemical stability as 3.15 V, and the transference number measurements confirm the predominant contribution of Mg2+ ions in the overall conductivity of the polymer electrolytes. A primary magnesium battery has been constructed using the polymer electrolyte of the highest conductivity (50 mw% PVAM: 50 mw% MgTf2), and a stable open circuit voltage of 2.04 V has been obtained. Discharge characteristics of the battery are also analyzed, and a light-emitting diode (LED) is allowed to glow continuously by connecting across the two constructed primary magnesium batteries in series.