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1 H NMR, thermal, and conductivity studies on PVAc based gel polymer electrolytes
Author(s) -
Baskaran R.,
Selvasekarapandian S.,
Kuwata N.,
Iwai Yoshiki,
Kawamura J.,
Hattori T.
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28810
Subject(s) - differential scanning calorimetry , electrolyte , materials science , polymer , amorphous solid , thermal stability , conductivity , ionic conductivity , polymer chemistry , scanning electron microscope , thermal analysis , analytical chemistry (journal) , lithium (medication) , dielectric spectroscopy , chemical engineering , chemistry , crystallography , composite material , organic chemistry , electrochemistry , thermal , thermodynamics , medicine , physics , electrode , meteorology , engineering , endocrinology
The lithium‐ion conducting gel polymer electrolytes (GPE), PVAc‐DMF‐LiClO 4 of various compositions have been prepared by solution casting technique. 1 H 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 T g with the increase in DMF concentrations. The thermal stability of the PVAc : DMF : LiClO 4 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. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008