Journal
CHEMISTRY TEACHER INTERNATIONAL
Volume 3, Issue 2, Pages 117-129Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/cti-2020-0018
Keywords
Debye response; dielectric relaxations; electrochemical impedance spectroscopy; polymer electrolytes
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Funding
- Universiti Teknologi MARA (UiTM), Malaysia [600-IRMI/MyRA/5/3/LESTARI (1072/2017)]
- Ministry of Education, Malaysia
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This article presents the phenomenological response of dielectric relaxation for polymer electrolytes through electrochemical impedance spectroscopy. Impedance and modulus analysis can help in decoupling dielectric and electric properties, facilitating the identification of conduction mechanisms in polymer electrolytes. The study aims to introduce a simplified background and technique for educational purposes, especially for beginner researchers.
In the Part 2 of this article, we present the phenomenological response of the dielectric relaxation for polymer electrolytes monitored by electrochemical impedance spectroscopy (EIS) in terms of electrochemical point of view, such as impedance (Z*), permittivity (epsilon*), loss tangent (tan delta), modulus (M*) and conductivity (sigma*) spectra. It is noteworthy to note that all the electrochemical aspects mentioned are of interest for conduction and seen as closely related to each other indirectly or directly. Two different systems; solid polymer electrolyte (SPE) [poly(ethylene oxide) (PEO) + lithium perchlorate (LiClO4)] and non-SPE [poly(methyl acrylate) (PMA) + LiClO4] were employed for discussion. EIS is a powerful technique to characterize the electrical properties of polymer electrolytes. The results suggest that impedance and modulus are of interest for decoupling of dielectric and electric properties by evaluating the short-range and long-range mobility of the charged entities, respectively. One is able to identify the conduction mechanism of the polymer electrolytes easily if the responses are well understood. The objective of this article to introduce a simplified yet an insightful background and technique that is easy to be followed and useful for educational purposes especially for beginners or young researchers for both undergraduates and postgraduates.
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