International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Special Issue: 09 | Sep -2017
p-ISSN: 2395-0072
www.irjet.net
One Day International Seminar on Materials Science & Technology (ISMST 2017) 4th August 2017 Organized by
Department of Physics, Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India
EFFECT OF DIFFERENT SALTS ON P(VdC-co-AN)GEL POLYMER ELECTROLYTESFOR Li –RECHARGEABLE BATTERIES 1,2M.Shanthi, 1,3M.Ramachandran, 1S.Rajendran, 1R.Subadevi, 1M.Sivakumar*
#120, Energy Materials Lab, Department of Physics, Alagappa University, Karaikudi-630003. Tamil Nadu, India. 2 Department of Physics, Kamaraj College of Engineering and Technology, Virudhunagar- 626001, Tamil Nadu, India. 3 Department of Physics, Arumugam Pillai Seethai Ammal College, Tiruppattur 630 211Tamil Nadu, India. ---------------------------------------------------------------------***--------------------------------------------------------------------1
Abstract - Polymeric gel electrolytes, based on P(VdC-co-
AN) comprising of ethylene carbonate as(EC) plasticizer and different lithium salts (LiBF4, LiClO4,and LiCF3SO3) were prepared via solution casting technique. The prepared electrolyte membranes were subjected to XRD, FTIR analyses to authorize the complex formation. AC impedance studies are carried out to investigate the ionic conductivity as a function of frequency in the temperature range from 303 to 353 K. The temperature dependent ionic conductivity plots seem to obey VTF relation. The TG/DTA analysis was carried out to study the thermal stability of the samples.
Keywords: PVdC-AN, AC impedance studies; TG/DTA, Polymer electrolytes, Ionic Conductivity
1. INTRODUCTION In search of high energy density storage batteries large number of electrolytes comprising of different cations such as cadmium, zinc, lead, cobalt and copper have been reported [1]. The majority of commercial batteries are fabricated with Li +salt solution immobilized in a variety of polymer matrices as electrolyte since lithium is the lightest of all metals. Most research work on polymer electrolyte has been made with lithium salt as ion source. As anode it well establish a contact with the electrolyte and provide good electropositive potential window. Hence, the batteries based on Li/Li + -salt facilitate a high energy density [2, 3]. The concentration of ionic charge carriers in the electrolyte depends on the dielectric constant of the polymer and the lattice energy of the salt. Salts having low lattice energy are preferred because it provides large number of ionic charge carriers by higher dissociation. Hence selection of suitable salt for the electrolyte preparation is inevitable. Accordingly, several reports are available for the significant choice the dopant salt. © 2017, IRJET
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Impact Factor value: 6.171
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Choe et al [4] reported PAN based electrolytes with LiN (CF3SO2)2, LiAsF6, LiCF3SO3 and LiPF6 in a binary mixture of plasticizers EC and PC. SubaDevi et al [5] examined comparison of three salts in blend polymer electrolyte based on Polyvinylidene fluoride (PVdF)–polyethyl methacrylate (PEMA) comprising of binary plasticizers solvents (EC and PC) (ethylene carbonate and propylene carbonate) and lithium salts LiX (X - ClO4, BF4, CF3SO3). The LiClO4 exhibits better performance among the other salt based on the systems studied. In order achieve high ionic conductivity at ambient temperature the influence of different salt on ionic conductivity was analyzed in this Chapter. The appropriate ratio of Polymer, salt and plasticizers were discussed in the previous chapters. In the present work, the polymer electrolyte systems composed of poly (vinylidene chloride – co-acrylonitrile) as a host polymer with plasticizer ethylene carbonate (EC) containing different dopant salts such as lithium tetra chloride(LiClO4), lithium tetrafluoroborate (LiBF4) and lithium trifluoromethane sulfonate (LiCF3SO3) have been prepared.
Sample preparation The polymer PVdC-co-AN employed in this study were obtained from Aldrich, USA. The plasticizer EC (also from Aldrich) was used as supplied. Lithium perchlorate (LiClO4), lithium tetrafluoroborate (LiBF4) and lithium trifluoromethane sulfonate (LiCF3SO3) were dried by annealing under vacuum at 120, 70 and 80C respectively for 24 h. Polymer electrolytes were prepared by dissolving appropriate amounts of the corresponding constituents in anhydrous tetra hydro furan (THF). The polymer and the salt solutions were mixed together and subjected to continuous stirring by magnetic stirrer to get homogenous solution. Finally the resulting homogenous solution was cast onto the well cleaned flat bottom petri dish. The films were ISO 9001:2008 Certified Journal
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