Potential complexes of NaCF3SO3-tetraethylene dimethyl glycol ether (tetraglyme)-based electrolytes for sodium rechargeable battery application
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The increasing energy demand on available global lithium resources has created concerns on development of new and advanced sustainable energy sources. Sodium-based batteries have emerged as promising substitutions to Li-based batteries. We describe here sodium trifluoromethanesulfonate (NaCF3SO3) electrolyte system based on tetraethylene glycol dimethyl ether (tetraglyme). The ionic conductivity of the electrolytes showed a maximum value of 1.6 mS cm−1 for 40 mol% of NaCF3SO3 at room temperature and increased up to of 9.5 mS cm−1 at 373 K. The system showed the anodic stability of the electrolytes up to ca. 5.2 V (Na+/Na) and facile deposition of sodium began at relatively low overpotential, around − 0.01 V vs. Na+/Na, which showed a good reversibility of the electrolytes. Preliminary tests of the electrolyte in half sodium-ion cells employing Na3V2(PO4)3 as cathode electrodes were performed and the cells delivered capacity of 74 mAh g−1 at C/10.
KeywordsSodium trifluromethanesulfonate Tetraglyme Electrochemical properties Sodium battery
The authors are grateful to the Battery Laboratory in Solar Energy Research Institute, UKM for battery testing facilities.
This study was financially supported by the Malaysian Ministry of Higher Education via FRGS/1/2015/SG06/UPNM/03/2.
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