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Int. J. Electroactive Mater. 8 (2020) 50-57

Chemical Interaction and Conductivity of a High Na-Ion Content NPropyl- N-Methylpyrrolidinium Bis(Fluorosulfonyl)Imide-Poly(Vinylidiene Fluoride-Hexafluropropylene) Gel Electrolytes

NOORHASLIN CHE SU1*, SITI AMINAH MOHD NOOR2, NOR SABIRIN MOHAMED3, Azizan Ahmad4, MUHD ZUAZHAN YAHYA5

1Faculty of Defence Science and Technology, National Defence University of Malaysia, Kuala Lumpur, Kuala Lumpur, Malaysia
2Centre for Defence Foundation Studies, National Defence University of Malaysia, Kuala Lumpur, Kuala Lumpur, Malaysia
3Centre for Foundation Studies in Science, University of Malaya, Kuala Lumpur, Kuala Lumpur, Malaysia
4School of Chemical Sciences and Food Technology, Faculty of Science and Technology, National University of Malaysia, Bangi, Selangor, Malaysia
5Centre for Defence Foundation Studies , National Defence University of Malaysia, Kuala Lumpur, Kuala Lumpur, Select the country

*Email Address : haslincs@gmail.com

Abstract : Sodium ion batteries have been extensively studied as promising alternative for lithium for meeting large scale energy storage system due to wide availability in the earth crust. Safety as the primary concern in developing high performance battery technology has initiated the study of ionic liquid based electrolytes which are potentially safer alternative to conventional organic solvent in electrolytes. In this study, we investigate the properties of superconcentrated sodium bis(fluorosulfonyl)amide (NaFSI) mixtures with the ionic liquid (IL) methylpropylpyrrolinium (C3mpyr) FSI in gel states. High concentration of NaFSI (55 mol %) are able to dissolve in ionic liquid forming clear and viscous solution. Gel electrolyte have been prepared with the addition of poly(vinylidiene fluoride-hexafluropropylene) (PVDF-HFP) which helps to immobilized the electrolytes and retains the solution in gel form. Electrochemical impedance spectroscopy (EIS) shows that the ionic conductivity of liquid and gel electrolytes increase as temperature increase. The chemical interactions of salt, ionic liquid and PVDF-HFP were studied using ATR-FTIR analysis. Linear sweep voltammetry has been performed to determine the electrochemical window for the gel electrolytes.

Keywords : superconcentrated sodium gel electrolyte,sodium ion conductors,ionic liquid,Poly (vinylidiene fluoride-hexafluropropylene