期刊
ELECTROCHIMICA ACTA
卷 361, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137024
关键词
Magnesium foil; Pressed magnesium anode; Sulfur batteries; SPAN Backspace; SEI formation
资金
- German Federal Ministry of Education and Research [03XP0208J]
- German Federal Ministry of Economic Affairs and Energy [03ETE003E]
A magnesium-sulfur (Mg-S) battery system based on a sulfurized poly(acrylonitrile) (SPAN) composite as cathode material is presented. Using magnesium tetrakis(hexafluoroisopropyloxy) borate, Mg[B(hfip)(4)](2), as conductive salt in the electrolyte, the cycle performance of Mg-S batteries based on SPAN and different types of Mg anodes, i.e. Mg foil and pressed Mg powder, respectively, were compared. A cell composed of Mg foil and SPAN delivered a discharge capacity around 300 mAh/g(sulfur) at C/30 while a cell based on SPAN and pressed Mg powder delivered ca. 500 mAh/g(sulfur) (energy density of ca. 422 mWh/g(sulfur)) at C/30 and also possessed good rate capability. The higher discharge capacities of Mg-S cells based on pressed anodes are attributed to the substantially higher specific surface area of the pressed cells. Postmortem analysis of aged cells based on SPAN and a pressed Mg anode indicates the formation of MgF2 on both the cathode and the anode along with magnesium polysulfide species. (C) 2020 Elsevier Ltd. All rights reserved.
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