Ana Robba (Author), Alen Vižintin (Author), Jan Bitenc (Author), Gregor Mali (Author), Iztok Arčon (Author), Matjaž Kavčič (Author), Matjaž Žitnik (Author), Klemen Bučar (Author), Robert Dominko (Author)

Abstract

Magnesium sulfur batteries are considered as attractive energy storage devices due to the abundance of electrochemically active materials and high theoretical energy density. Here we report the mechanism of a Mg-S battery operation, which was studied in the presence of simple and commercially available salts dissolved in a mixture of glymes. The electrolyte offers high sulfur conversion into MgS in the first discharge with low polarization. The electrochemical conversion of sulfur with magnesium proceeds through two well-defined plateaus, which correspond to the equilibrium between sulfur and polysulfides (high-voltage plateau) and polysulfides and MgS (low-voltage plateau). As shown by XANES, RIXS and NMR studies, the end discharge phase involves MgS with Mg atoms in a tetrahedral environment resembling the wurtzite structure, while chemically synthesized MgS crystalizes in the rock-salt structure with octahedral coordination of magnesium.

Keywords

magnesium;magnesium-sulfur batteries;rechargeable batteries;XAS;NMR;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UNG - University of Nova Gorica
UDC: 53
COBISS: 4933883 Link will open in a new window
ISSN: 0897-4756
Views: 3643
Downloads: 0
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Other data

URN: URN:SI:UNG
Type (COBISS): Not categorized
Pages: str. 9555-9564
Volume: ǂVol. ǂ29
Issue: ǂiss.ǂ12
Chronology: 2017
DOI: 10.1021/acs.chemmater.7b03956
ID: 10871791
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