An effective dual electrolyte designed to enhance the performance of magnesium/sulfur batteries. | ||||
| Journal of the Egyptian Society for Basic Sciences-Physics | ||||
| Article 4, Volume 1, Issue 2 - Serial Number 6, July 2024, Page 47-56 PDF (698.39 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jesbsp.2024.292325.1020 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
rania gamal Abd-elghafar   1; meawad mohamed elkholy2
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| 1Elsewedy University of Technology | ||||
| 2-Physics Department, Faculty of science, Menoufia University, Shibin El-Kom. Egypt -Physics Department, Faculty of science, New Mansoura University, Dakahlia. Egypt | ||||
| Abstract | ||||
| Magnesium batteries still encounter significant hurdles in their advancement, including issues like rapid loss of capacity, absence of suitable electrolytes, passivation of the magnesium anode, sluggish conversion reactions, and self-discharge. In this study, a sulfur cathode incorporating carbon-based material S/C is devised and tested within a magnesium battery framework utilizing a dual electrolyte system. This dual electrolyte comprises two layers: one derived from a simple halogen-free electrolyte (HFE) and another from a polymer layer interface (PLI). The HFE consists of magnesium nitrate (Mg(NO3)2), magnesium triflate (Mg(CF3SO3)2), and succinonitrile (SN) dissolved in acetonitrile (ACN)/tetraethylene glycol dimethyl ether (G4) cosolvents, supplemented with dimethyl sulfoxide as a functional additive. The PLI, on the other hand, incorporates polyvinylidene fluoride (PVDF), SN, and (Mg(CF3SO3)2), dissolved in methyl-2- pyrrolidine (NMP)/G4 cosolvents, aimed at insulating the Mg anode surface from the liquid electrolyte. The dual electrolyte demonstrates promising characteristics including high ionic transference number ( 𝑡𝑚𝑔+2 = 0.9), excellent oxidation stability, low overpotential, and consistent Mg stripping/plating for up to 100 hours. The Mg/S full cell exhibits an impressive initial discharge/charge capacity of approximately 1312/432 mAhg-1 . Examination of sulfur cathodes at various electrochemical states indicates the reversible conversion reaction of Mg2+ ions within the sulfur cathode framework. | ||||
| Keywords | ||||
| Magnesium/Sulfur battery; Dual electrolyte; specific capacity | ||||
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