1H NMR, thermal, and conductivity studies on PVAc based gel polymer electrolytes

R. Baskaran, S. Selvasekarapandian, N. Kuwata, Yoshiki Iwai, J. Kawamura, T. Hattori

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The lithium-ion conducting gel polymer electrolytes (GPE), PVAc-DMF-LiClO4 of various compositions have been prepared by solution casting technique. 1H NMR results reveal the existence of DMF in the gel polymer electrolytes at ambient temperature. Structure and surface morphology characterization have been studied by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM) measurements. Thermal and conductivity behavior of polymer- and plasticizer-salt complexes have been studied by differential scanning calorimetry (DSC), TG/DTA, and impedance spectroscopy results. XRD and SEM analyses indicate the amorphous nature of the gel polymer-salt complex. DSC measurements show a decrease in Tg with the increase in DMF concentrations. The thermal stability of the PVAc: DMF: LiClO4 gel polymer electrolytes has been found to be in the range of (30-60°C). The dc conductivity of gel polymer electrolytes, obtained from impedance spectra, has been found to vary between 7.6 × 10-7 and 4.1 × 10-4 S cm-1 at 303 K depending on the concentration of DMF (10-20 wt %) in the polymer electrolytes. The temperature dependence of conductivity of the polymer electrolyte complexes appears to obey the VTF behavior.

Original languageEnglish
Pages (from-to)1945-1954
Number of pages10
JournalJournal of Applied Polymer Science
Issue number4
Publication statusPublished - 2008 Nov 15


  • DSC
  • Gel polymer electrolytes
  • H NMR
  • Ionic conductivity
  • PVAc
  • TG/DTA
  • VTF behavior


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