Characteristics of magnesium-sulfur batteries based on a sulfurized poly(acrylonitrile) composite and a fluorinated electrolyte
| Autor: | Peiwen Wang, Felix Ziegler, Brigitta Sievert, Ulrich Starke, Kathrin Küster, Joachim Häcker, Julian Kappler, Michael R. Buchmeiser |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Magnesium General Chemical Engineering chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cathode 0104 chemical sciences law.invention Anode chemistry.chemical_compound chemistry Chemical engineering law Specific surface area Electrochemistry Acrylonitrile 0210 nano-technology FOIL method Polysulfide |
| Zdroj: | Electrochimica Acta. 361:137024 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2020.137024 |
| Popis: | 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/gsulfur at C/30 while a cell based on SPAN and pressed Mg powder delivered ca. 500 mAh/gsulfur (energy density of ca. 422 mWh/gsulfur) 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. Post-mortem 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. |
| Databáze: | OpenAIRE |
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