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<p>In this study, we demonstrate the potential of a gel polymer electrolyte based on polyethylene oxide (PEO), complexed with magnesium triflate [Mg(CF<sub>3</sub>SO<sub>3</sub>)<sub>2</sub>] and plasticized with ethylene carbonate (EC) and propylene carbonate (PC), for use in rechargeable magnesium batteries. The optimized composition, PEO (12.20 wt%), Mg(CF<sub>3</sub>SO<sub>3</sub>)<sub>2</sub> (14.6 wt%), EC (36.6 wt%), and PC (36.6 wt%) achieves a notable ionic conductivity of 2.52 × 10<sup>-3</sup> S cm<sup>-1</sup> at room temperature, which increases with temperature according to Arrhenius behavior. The electrolyte demonstrates a high Mg<sup>2+</sup> ion transference number (<i>t</i><sub><i>Mg</i></sub><sup>++</sup>  = 0.51) and a high total ionic transference number (<i>t</i><sub>ion</sub> = 0.98) highlighting its excellent performance as an Mg<sup>2+</sup> ion conductor. Preliminary battery tests with the cell configuration Mg/PEO:EC:PC:Mg(CF<sub>3</sub>SO<sub>3</sub>)<sub>2</sub>/TiO<sub>2</sub>-C show a discharge capacity of 65&#xa0;mA&#xa0;h&#xa0;g<sup>-1</sup> at a 0.015C rate, with an open-circuit voltage of 1.85&#xa0;V. These results suggest that the PEO:EC:PC:Mg(CF<sub>3</sub>SO<sub>3</sub>)<sub>2</sub> gel polymer electrolyte is a promising candidate for application in magnesium-based electrochemical devices.</p> Graphical Abstract <p></p>

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Mg++ ion conducting polyethylene oxide/magnesium triflate quasi-solid state electrolyte for rechargeable Mg++ battery application

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • H. N. M. Sarangika,
  • M. A. K. L. Dissanayake,
  • G. K. R. Senadeera

摘要

In this study, we demonstrate the potential of a gel polymer electrolyte based on polyethylene oxide (PEO), complexed with magnesium triflate [Mg(CF3SO3)2] and plasticized with ethylene carbonate (EC) and propylene carbonate (PC), for use in rechargeable magnesium batteries. The optimized composition, PEO (12.20 wt%), Mg(CF3SO3)2 (14.6 wt%), EC (36.6 wt%), and PC (36.6 wt%) achieves a notable ionic conductivity of 2.52 × 10-3 S cm-1 at room temperature, which increases with temperature according to Arrhenius behavior. The electrolyte demonstrates a high Mg2+ ion transference number (tMg++  = 0.51) and a high total ionic transference number (tion = 0.98) highlighting its excellent performance as an Mg2+ ion conductor. Preliminary battery tests with the cell configuration Mg/PEO:EC:PC:Mg(CF3SO3)2/TiO2-C show a discharge capacity of 65 mA h g-1 at a 0.015C rate, with an open-circuit voltage of 1.85 V. These results suggest that the PEO:EC:PC:Mg(CF3SO3)2 gel polymer electrolyte is a promising candidate for application in magnesium-based electrochemical devices.

Graphical Abstract