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Investigations of Relaxation Dynamics and Observation of Nearly Constant Loss Phenomena in PEO 20 -LiCF 3 SO 3 -ZrO 2 Based Polymer Nano-Composite Electrolyte
Investigations of Relaxation Dynamics and Observation of Nearly Constant Loss Phenomena in PEO 20 -LiCF 3 SO 3 -ZrO 2 Based Polymer Nano-Composite Electrolyte
- Source :
- Electrochimica Acta. 202:147-156
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- The conduction mechanism of polymer nano-composite electrolytes are studied using broadband dielectric spectroscopy over a wide range of frequency and temperature. The polymer nano-composites consisting of polyethylene oxide as polymer host, lithium trifluoromethanesulfonate as salt, and nano-crystalline zirconia as filler are prepared using solution casting method. Formation of polymer salt complex and nano-composites are confirmed from x-ray diffraction studies. The electrical conductivity and relaxation phenomena of the polymer salt complex as well as the composites are studied using broadband dielectric spectroscopy. At room temperature, the dc conductivity of the polymer nano-composites are found higher by two orders of magnitude than that of corresponding polymer salt complex. Temperature dependence of dc conductivity is following Vogel-Tamman-Fulcher trend, suggesting strong coupling between ionic conductivity and segmental relaxation in polymer electrolytes. Relaxation phenomena are studied with dielectric and modulus formalism. Frequency dependent ac conductivity show universal dielectric response and nearly constant loss features at high and low temperature regions respectively. The origin of universal dielectric response and nearly constant loss are analysed and discussed using different approaches. Kramer - Kronig approach suggests the origin of nearly constant loss is due to caged ion dynamics feature.
- Subjects :
- Materials science
General Chemical Engineering
Analytical chemistry
Physics::Optics
chemistry.chemical_element
02 engineering and technology
Electrolyte
Dielectric
010402 general chemistry
01 natural sciences
Condensed Matter::Materials Science
Electrical resistivity and conductivity
Electrochemistry
Ionic conductivity
chemistry.chemical_classification
Quantitative Biology::Biomolecules
Polymer
021001 nanoscience & nanotechnology
Thermal conduction
0104 chemical sciences
Condensed Matter::Soft Condensed Matter
chemistry
Chemical physics
Relaxation (physics)
Lithium
0210 nano-technology
Subjects
Details
- ISSN :
- 00134686
- Volume :
- 202
- Database :
- OpenAIRE
- Journal :
- Electrochimica Acta
- Accession number :
- edsair.doi...........22a6a0ded211bc247c9abd5194889b10
- Full Text :
- https://doi.org/10.1016/j.electacta.2016.03.134