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Charge Carrier Relaxation in Different Plasticized PEO/PVDF-HFP Blend Solid Polymer Electrolytes.
1Department of Solid State Physics, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India.
The Journal of Physical Chemistry. B
|May 11, 2017
Summary
This study investigates plasticizers in PEO/PVDF-HFP-LiClO4 electrolytes, finding charge carrier relaxation depends on plasticizer type, not temperature. This offers insights into advanced battery materials.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Electrolytes
Background:
- Polymer electrolytes are crucial for developing safer and more efficient energy storage devices.
- Poly(ethylene oxide) (PEO) and Poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) are common polymer hosts for electrolytes.
- Lithium perchlorate (LiClO4) is a widely used lithium salt in these systems.
Purpose of the Study:
- To investigate the effect of ethylene carbonate plasticizer concentration on charge carrier dynamics in PEO/PVDF-HFP-LiClO4 blend electrolytes.
- To compare the influence of different plasticizers (ethylene carbonate, propylene carbonate, dimethyl carbonate) on conductivity and relaxation.
- To analyze charge carrier conduction and relaxation mechanisms using advanced data analysis models.
Main Methods:
- Fabrication of PEO/PVDF-HFP-LiClO4 blend electrolytes with varying ethylene carbonate concentrations.
- Electrochemical impedance spectroscopy (EIS) to measure frequency-dependent conductivity.
- Analysis of conductivity data using the random free-energy barrier model and Havriliak-Negami/Kohlrausch-Williams-Watts functions for relaxation studies.
Main Results:
- Charge carrier relaxation dynamics were found to be independent of temperature but dependent on the type of plasticizer used.
- Vogel-Tammann-Fulcher behavior was observed for the temperature dependence of ionic conductivity and relaxation times.
- Analysis revealed highly nonexponential charge carrier relaxation, indicated by a stretched exponent significantly lower than unity.
Conclusions:
- The choice of plasticizer plays a critical role in tailoring the charge carrier relaxation dynamics in PEO/PVDF-HFP-LiClO4 electrolytes.
- The random free-energy barrier model provides a new approach for analyzing conductivity data, considering polarization effects.
- Understanding these relaxation mechanisms is key for optimizing the performance of solid-state battery electrolytes.
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