Effect of lithium bis(oxalato)borate on the Structural, microstructural and electrochemical properties of blend solid polymer electrolyte

Abstract

Blend solid polymer electrolyte based on PEO, PVP complexed with lithium LiBOB were synthesized by solution cast technique and impact of LiBOB on the morphology, structure, and electrochemical properties is examined. The XRD and FESEM analysis reveals the enhancement of amorphous content on salt addition. The FTIR spectroscopy evidences the complex formation. The ionic conductivity for optimized system was two order higher than salt free system, i.e. ~0.5x10-5 S cm-1 (@RT) and increases to ~0.65 mS cm-1 (@100 oC) for O/Li=16 and temperature dependent conductivity follows Arrhenius nature. The high tion (~0.99) evidences the ionic nature of complexed electrolyte. DSC analysis evidences the suppression of crystallinity and shift of glass & melting temperature toward lower temperature implies the enhancement of amorphous content. Finally, an interaction mechanism is proposed for exploring the ion transport mechanism. The present electrolyte system can be a potential candidate for application in solid-state batteries