A novel gel electrolyte with lithium difluoro(oxalato)borate salt and Sb2O3 nanoparticles for lithium ion batteries

A new type of lithium difluoro(oxalate)borate salt was synthesized by solid state reaction method and has been incorporated into polyvinyledenefluoride-hexafluoropropylene (PVdF-HFP) skeleton. Ethylene carbonate (EC) and diethyl carbonate (DEC) mixture was used as plasticizing agent. Sb2O3 nanoparticle was used as the filler in the polymer host to prepare the nanocomposite polymer electrolytes (NCPE) for lithium ion batteries by solution casting technique. All the membranes were subjected to a.c. impedance, mechanical stability and morphological analysis. Among them 5 wt% Sb2O3 having NCPE exhibited enhanced conductivity of 0.298 mS cm(-1) at ambient temperature and Young's modulus increased from 1.32 to 2.31 MPa after the addition of Sb2O3. The conductivity enhancement is explained in terms of Vogel-Tamman-Fulcher (VTF) theory. (C) 2007 Elsevier Masson SAS. All rights reserved.