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

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 $$ {NO}_3^{-} $$ 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.

SCOBY-based bacterial cellulose as free standing electrodes for safer, greener and cleaner energy storage technology

“…The finding is comparable to other Na-based electrolytes e.g. PVA-NaI-Gly (0.98) [ 41 ], PVA-NaI (0.954–0.974) [ 42 ], and CMC-NaNO 3 (0.97) [ 43 ].

Figure 4 Polarization curve of CS-NaI-Gly electrolyte at 0.2 V.

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

“…From Fig. 8b, there are no relaxation peaks in the plot of ′′ against log ω suggesting that the rise in dc conductivity is attributed to an increase in ion density rather than a structural relaxation process related to the reorientation of the dipoles in the system or the segmental relaxation of the polymer chains (Shetty et al 2021a). It is observed that both ′ and ′′ increase with salt concentration and is highest for S30 sample.…”

Modification in the microstructure of sodium carboxymethylcellulose/polyvinyl alcohol polyblend films through the incorporation ofNaNO3for energy storage applications

“…From Figure 8B, a relaxation peak can be seen. This suggests that the increase in conductivity may be associated with an increase in carrier concentration and/or the structural relaxation phase, such as the realignment of dipoles in the polymer system 50 . The structural relaxation could be attributed to the side chain motion of Na‐CMC, that is, 51 .…”