Ionic conductivity enhancement of PVA: carboxymethyl cellulose poly‑blend electrolyte flms through the doping of NaI salt

Cyriac, Vipin and Ismayil, . and Noor, I M and Mishra, Kuldeep and Chavan, Chetan and Bhajantri, Rajashekhar F and Masti, Saraswathi P (2022) Ionic conductivity enhancement of PVA: carboxymethyl cellulose poly‑blend electrolyte flms through the doping of NaI salt. Cellulose, 29. pp. 3271-3291. ISSN 0969-0239

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Abstract

In this paper, we report the efect of dop�ing sodium iodide (NaI) salt into a polymer blend matrix of sodium carboxymethyl cellulose (NaCMC) and poly(vinyl alcohol) (PVA). Solution casting approach was used to prepare solid polymer elec�trolyte (SPE) flms. The flms were characterized by Fourier-transform infrared spectroscopy (FTIR), X-Ray difraction (XRD), electrical impedance spec�troscopy, thermogravimetric analysis (TGA), and dif�ferential scanning calorimetry (DSC). XRD showed that NaI incorporation decreased the crystallinity of NaCMC/PVA-based SPE. FTIR technique confrmed the complexation of salt with polymer matrix due to the formation of the coordination bond between Na+ and –OH group and hydrogen bond between I − and –CH group. The sample with 30 wt% NaI showed the highest conductivity of 2.52× 10–3 S cm−1, strongly infuenced by the highest charge concentration (n), not its mobility (μ). DSC analysis revealed an increase in glass transition temperature (Tg) with increasing salt content. TGA studies showed a decrease in thermal stability with salt inclusion. The transference num�ber was found to be 0.99 for the highest conducting sample showing the primary charge carriers are ions. The highest conducting sample exhibited a mechani�cal strength of 15.42 MPa at room temperature, and it has been used to fabricate a battery to evaluate its suitability in energy storage devices.

Item Type: Article
Uncontrolled Keywords: Polymer blend · NaCMC-PVA hybrid · Solid polymer electrolyte · Degree of crystallinity · Ionic conductivity · Transport properties
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 23 Jun 2022 05:12
Last Modified: 23 Jun 2022 05:12
URI: http://eprints.manipal.edu/id/eprint/158838

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