Studies on 1-Butyl 3-Methylimidazolium Hexafluorophosphate Incorporated

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Mechanics, Materials Science & Engineering, July 2017 – ISSN 2412-5954

Studies on 1-Butyl 3-Methylimidazolium Hexafluorophosphate Incorporated PVC-PBMA Polymer Electrolytes 1

R. Arunkumar1, Ravi Shanker Babu1, M. Usha Rani1 1 – Department of Physics, School of Advanced Sciences, VIT University, Vellore, Tamilnadu, India DOI 10.2412/mmse.59.9.873 provided by Seo4U.link

Keywords: ionic liquids, LiPF6, solution casting techniques, impedance analysis, SEM analysis.

ABSTRACT. Polymer electrolytes consisting of polyvinyl chloride (PVC) and poly (butyl methacrylate) (PBMA) as polymers, lithium hexafluorophosphate (LiPF6) as complex salt and 1-butyl 3-methylimidazolium hexafluorophosphate (BmImPF6) as plasticizer were prepared by solution casting technique. The effect of ionic liquid (BmImPF6) on PVCPBMA blend polymer electrolytes are investigated by AC impedance, dielectric and SEM analysis to elucidate their electrical, dielectric and surface morphological assessment. Ionic conductivity of the prepared polymer electrolytes is found to be in the order of 10-3 S cm-1. Polymer electrolyte with PVC-PBMA-LiPF6-BmImPF6 (17-17-06-60) is found to be a potential candidate in battery applications.

Introduction. Tremendous research on solid polymer electrolytes with salt/plasticizer/ceramics replaces liquid electrolytes in lithium batteries because of limitations in liquid electrolytes like corrosion, leakage, flammability, degradation, etc. Solid polymer electrolytes (SPE) fulfil those drawbacks and further SPE are highly compatible with electrodes when compare to its counterparts [1], [2], [3]. Solid polymer electrolytes based lithium batteries are used as power sources (electronic devices) in laptops, digital cameras, mobile phones, hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs) and as batteries for electric vehicles (EVs) [4], [5]. The main drawback with solid polymer electrolyte battery is its poor ionic conductivity at room temperature. To increase the room temperature ionic conductivity, several methods like addition of plasticizer, blending of polymers, crosslinking of polymer, incorporation of inorganic fillers and ionic liquids (ILS) are reported. Among this, the present work focuses on ionic liquid based polymer electrolytes. Ionic liquid doped polymer electrolytes have good ionic conductivity at low temperature because it can dissociate the anion and cation easily at lower temperature due to the molten state of ILS is below 373K. Further ionic liquid doped polymer electrolytes have good thermal stability, non-flammability, non-volatility, non-toxicity and wide electrochemical window [6]. The ionic liquid incorporated polymer electrolyte batteries are operated at low temperature (313K) [7]. Ionic liquid have the advantages of the previously mentioned properties when compared to those with organic solvents [8]. The present work reports the investigation on ILS doped polymer electrolytes. Extensively studied on the variation in ionic conductivity, dielectric behaviour and morphology of polymer electrolytes with BmImPF6carried out using ac impedance, dielectric and SEM analysis respectively. Experimental. Polyvinyl chloride with average molecular weight 48000 g/mol, poly (butyl methacrylate) with average molecular weight 337000 g/mol, lithium hexafluorophosphateand 1-butyl 3-methylimidazolium hexafluorophosphatewere procured from sigma Aldrich, USA. PVC-PBMA polymer electrolytes with addition of BmImPF6at different ratios were prepared by solution casting technique. The required amounts of substances were dried at 373K under vacuum at 10-3 millibar for 10h. The dried polymers and salt were treated with pre-distilled tetrahydrofuran and left undisturbed. The solution of PVC and PBMA were mixed together for 24h using a magnetic 1

© 2017 The Authors. Published by Magnolithe GmbH. This is an open access article under the CC BY-NC-ND license http://creativecommons.org/licenses/by-nc-nd/4.0/

MMSE Journal. Open Access www.mmse.xyz


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