Dielectric relaxations and ion transport study of NaCMC:NaNO3 solid polymer electrolyte films

Supriya K Shetty,Ismayil Ismayil,Ganesh Sanjeev,V Ravindrachary,Shreedatta Hegde,Rajashekhar F Bhajantri,Saraswati P Masti

doi:10.1007/s11581-021-04023-y

Supriya K Shetty, Ismayil Ismayil + Show 5 more

Open Access

https://doi.org/10.1007/s11581-021-04023-y

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Journal: Ionics	Publication Date: Apr 13, 2021
Citations: 27	License type: open-access

Affiliation: Manipal Academy of Higher Education, Mangalore University

Abstract

Na+ ion-conducting solid polymer electrolyte (SPE) of sodium salt of carboxymethyl cellulose (NaCMC) doped with sodium nitrate (NaNO3) was developed by solution casting method. FTIR technique confirmed the formation of hydrogen bonding between {NO}_3^{-} anion and functional groups of NaCMC. XRD study revealed the low degree of crystallinity that reduced upon doping. Impedance spectroscopy was adapted in order to analyze the conductivity and dielectric relaxation phenomena of the polymer-salt complex. FTIR deconvolution technique was employed to understand the factor that influences the ionic conductivity in SPE; concentration of mobile ions and ionic mobility both play a vital role. Ion transference number has been found out to be > 0.97 for all samples indicating that the conducting species are primarily ions. The highest ionic conductivity of ̴ 3 × 10−3 Scm−1 with the mechanical strength of 30.12 MPa was achieved for a host containing 30 wt.% NaNO3 at ambient temperature.

Highlights

Rechargeable lithium-ion batteries (LIBs) are used to power the portable electronic gadgets and hybrid/electric vehicles but can store a significant amount of energy from renewable resources making less reliant on fossil fuel, leading to the substantial increase in the demand and supply for lithium
FTIR spectra of pure NaCMC, NaNO3 and polymer complexes were recorded in the transmittance mode, as shown in Fig. 1a, and possible vibration mode and wavenumber are tabulated in group attached to the main chain of the polymer [22, 23]
A new solid biopolymer electrolyte system based on NaCMC doped with sodium nitrate was prepared by solution casting technique

Summary

Introduction

Rechargeable lithium-ion batteries (LIBs) are used to power the portable electronic gadgets and hybrid/electric vehicles but can store a significant amount of energy from renewable resources making less reliant on fossil fuel, leading to the substantial increase in the demand and supply for lithium.

Results

Conclusion