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Impact of exfoliation/intercalation of nano-clay on structure, morphology and electrical properties of poly (ethylene oxide) based solid nanocomposite electrolytes

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Abstract

The structure and morphology of the solid nanocomposite polymer electrolytes (SNCPEs) have been studied in the present article. SNCPE systems, consisting of Poly (ethylene oxide) (PEO) host polymer, ammonium iodide (NH4I) salt and Laponite nano-filler, are prepared through the method of ball-milling followed by conventional solution casting technique. Addition of nano-filler in the polymer—salt complex, in general, improves thermal and mechanical stability of the electrolyte films. However, since Laponite possesses (2-d) layered structure, intercalation and/or exfoliation of this nano clay introduces significant variation in the structure and morphology of the host polymer. The present paper investigates the nano clay induced microstructural modifications in polymer/polymer composites and its impact in related properties of PEO-NH4I based SNCPEs. The systematic study on SNCPEs predicts the optimised proportions of the constituents for maximum modifications in dielectric properties and the dc ion conductivity of the system. The main motivation of the work is to understand and analyse the intercalation/exfoliation induced property enhancement of the electrolyte. The structural modifications have been investigated through different techniques like electron microscopy, diffraction analysis and infra-red spectroscopy. The X-ray diffraction analysis along with the calorimetric studies of SNCPE systems confirms the increase in amorphicity of the polymer matrix depending on the concentrations of salt and clay content in the composite. The enhanced amorphicity results in improved ion diffusivity that plays an important role in conductivity enhancement. However, the present work establishes that increased rate of ion dissociation, owing to modified ion – polymer / ion—clay interaction, plays the dominating role in enhancing the dc conductivity of the electrolyte at room temperature. Indication of increased ion dissociation and carrier concentration are confirmed through the FTIR and impedance spectroscopy respectively. Corresponding analysis of dielectric property and relaxation behaviour reveals the structure–property correlation and the contribution of polymer segmental mobility in enhancing the dc ionic conductivity of the clay loaded SNCPEs compared to clay free solid electrolyte systems.

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Acknowledgements

RR and PDB wish to acknowledge WBDST for funding (File No. ST/P/S&T/16G-25/2018) the research work. The authors also acknowledge DST, Government of India, for developing and providing instrument facility like LCR meter (Agilent 4294A-Precision Impedance Analyzer) under FIST programme at the Department of Physics, Jadavpur University.

Funding

RR and PDB wish to acknowledge WBDST for funding (File No. ST/P/S&T/16G-25/2018) the research work.

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  1. Physics Department, Condensed Matter Physics Research Centre, Jadavpur University, Kolkata, 700032, WB, India

    Mou Saha, Anupa Roy Choudhury & Tapas Kumar Ballabh

  2. Physics Department, Gurudas College, Kolkata, 700054, WB, India

    Ruma Ray

  3. Zoology Department, Gurudas College, Kolkata, 700054, WB, India

    Poulami De Bhowmik

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  1. Mou Saha
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Saha, M., Ray, R., Choudhury, A.R. et al. Impact of exfoliation/intercalation of nano-clay on structure, morphology and electrical properties of poly (ethylene oxide) based solid nanocomposite electrolytes. J Polym Res 28, 299 (2021). https://doi.org/10.1007/s10965-021-02622-x

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