Ionic conductivity and dielectric permittivity of PEO-LiClO{sub 4} solid polymer electrolyte plasticized with propylene carbonate

Journal Article · Sun Feb 15 04:00:00 EST 2015 · AIP Advances

DOI:https://doi.org/10.1063/1.4913320· OSTI ID:22454455

Das, S.

We have studied ionic conductivity and dielectric permittivity of PEO-LiClO{sub 4} solid polymer electrolyte plasticized with propylene carbonate. Differential scanning calorimetry and X-ray diffraction studies confirm minimum volume fraction of crystalline phase for the polymer electrolyte with 40 wt. % propylene carbonate. The ionic conductivity exhibits a maximum for the same composition. The temperature dependence of the ionic conductivity has been well interpreted using Vogel-Tamman-Fulcher equation. Ion-ion interactions in the polymer electrolytes have been studied using Raman spectra and the concentrations of free ions, ion-pairs and ion-aggregates have been determined. The ionic conductivity increases due to the increase of free ions with the increase of propylene carbonate content. But for higher content of propylene carbonate, the ionic conductivity decreases due to the increase of concentrations of ion-pairs and ion-aggregates. To get further insights into the ion dynamics, the experimental data for the complex dielectric permittivity have been studied using Havriliak–Negami function. The variation of relaxation time with temperature obtained from this formalism follows Vogel-Tamman-Fulcher equation similar to the ionic conductivity.

• OSTI ID: 22454455
• Journal Information: AIP Advances, Journal Name: AIP Advances Journal Issue: 2 Vol. 5; ISSN AAIDBI; ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALORIMETRY
CARBONIC ACID ESTERS
DIELECTRIC MATERIALS
ELECTROLYTES
ION PAIRS
ION-ION COLLISIONS
IONIC CONDUCTIVITY
IONS
LITHIUM PERCHLORATES
PERMITTIVITY
POLYMERS
RAMAN SPECTRA
RELAXATION TIME
SOLIDS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION