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Ionics

, Volume 25, Issue 2, pp 627–639 | Cite as

Ion specificity towards structure-property correlation of poly (ethylene oxide) [PEO]-NH4I and PEO-KBr composite solid polymer electrolyte

  • Subir K. Patla
  • Madhumita MukhopadhyayEmail author
  • Ruma RayEmail author
Original Paper
  • 64 Downloads

Abstract

Ion conduction mechanism in polymer-salt composite is highly dependent on the optimization of the process parameters. In this investigation, studies on poly (ethylene oxide) [PEO] with different salt viz. ammonium Iodide (NH4I) and potassium bromide (KBr) [represented as N-series and K-series respectively] are carried out. Highest ionic conductivity of ~ 10−4 S cm−1 is observed for PEO-NH4I (20%) composite which is found to be the most amorphous. FTIR spectra of N-series are deconvoluted within 3187–3442 cm−1 in order to estimate the percentage of free and contact ions. Number density of free ions is found to increase proportionately with the salt content. Detailed characterization is carried out in view of salt-induced microstructural inhomogeneity. Flexibility of the polymer blend is reflected in several ion-transport parameters like carrier concentration, mobility, etc. Two relaxation times [τ1 (~ 10−4 s) and τ2 (~ 10−7 s)] as being exhibited in the complex electric modulus clearly illustrate the existence of both amorphous and crystalline regimes within PEO-salt composite.

Keywords

Polymer-salt composite Ionic conductivity Dielectric study FTIR SEM morphology 

Notes

Acknowledgements

SKP is thankful to Inter-University Accelerator Centre (IUAC), Delhi, for providing Junior research fellowship. Dr. Dipankar Mandal of Physics Department, Jadavpur University, Kolkata, is also acknowledged for rendering help in performing FTIR study in his laboratory. Mr. Kuntal Maity of Physics Department, Jadavpur University, Kolkata, is also acknowledged for helping SKP in FTIR instrument handling. The authors also acknowledge FIST-2, DST Government of India, at the Physics Department, Jadavpur University for providing the facility of SEM microscope. Dr. Jayanta Mukhopadhyay, Senior Scientist, CSIR-CGCRI. Kolkata, India, is also acknowledged for his valuable input and discussions during manuscript preparation.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Physics DepartmentGurudas CollegeKolkataIndia
  2. 2.Condensed Matter Physics Research Centre, Physics DepartmentJadavpur UniversityKolkataIndia
  3. 3.Department of Chemistry, Amity Institute of Applied Sciences (AIAS)Amity UniversityKolkataIndia

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