Magnesium Polysulfides: Synthesis, Disproportionation, and Impedance Response in Symmetrical Carbon Electrode Cells

Drvaric Talian Sara; Vizintin Alen; Bitenc Jan; Aquilanti Giuliana; Randon-Vitanova Anna; Gaberscek Miran; Dominko Robert

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Magnesium Polysulfides: Synthesis, Disproportionation, and Impedance Response in Symmetrical Carbon Electrode Cells

机译：镁多硫化物：对称碳电极电池中的合成，歧化和阻抗响应

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Magnesium polysulfides have a key role during the redox reaction in magnesium-sulfur batteries. However, kinetics of the Mg polysulfide disproportionation, transport, and solubility in electrolytes are rarely studied. To fill this gap, we here report the synthesis of different chain-length Mg polysulfides and their characterization with H-1 NMR, ATR-IR, and XANES spectroscopies. The tendency of polysulfides to disproportionate in solutions is confirmed with UV/Vis spectroscopy. To probe their reactivity and diffusivity, impedance spectroscopy is performed in symmetrical cells consisting of two planar glassy carbon or porous carbon electrodes containing Mg polysulfide catholyte. Several transport-reaction parameters are obtained, such as exchange current densities, chemical diffusion coefficients, transference numbers of polysulfides, and conductivities. Moreover, we show that the solubility of Mg polysulfides in Mg(TFSI)(2), MgCl2 ether-based electrolyte is affected at rather moderate concentration of polysulfides, thereby having an impact on the cell performance.

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来源
《ChemElectroChem》 |2021年第6期|共8页
作者
Drvaric Talian Sara; Vizintin Alen; Bitenc Jan; Aquilanti Giuliana; Randon-Vitanova Anna; Gaberscek Miran; Dominko Robert;
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作者单位

Natl Inst Chem Dept Chem Mat Hajdrihova 19 SI-1000 Ljubljana Slovenia;

Natl Inst Chem Dept Chem Mat Hajdrihova 19 SI-1000 Ljubljana Slovenia;

Natl Inst Chem Dept Chem Mat Hajdrihova 19 SI-1000 Ljubljana Slovenia;

Elettra Sincrotrone Trieste SCpA 14 Km 163-5 I-34149 Trieste Italy;

Honda R&

D Europe GmbH Carl Legien Str 30 D-63703 Offenbach Germany;

Natl Inst Chem Dept Chem Mat Hajdrihova 19 SI-1000 Ljubljana Slovenia;

Natl Inst Chem Dept Chem Mat Hajdrihova 19 SI-1000 Ljubljana Slovenia;

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原文格式 PDF
正文语种 eng
中图分类物理化学（理论化学）、化学物理学;
关键词
magnesium-sulfur batteries; reaction mechanisms; polysulfides; impedance; electrode cells;

机译：镁 - 硫磺电池;反应机制;多硫化物;阻抗;电极细胞;

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Magnesium Polysulfides: Synthesis, Disproportionation, and Impedance Response in Symmetrical Carbon Electrode Cells

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