Modifying the microstructure of chitosan/methylcellulose polymer blend via magnesium nitrate doping to enhance its ionic conductivity for energy storage application

Abstract

In this study, different weight percentages of Mg(NO3)2 were added to a polymer blend composed of chitosan (CS) and methylcellulose (MC). The solution casting method was adopted to prepare the polymer electrolyte films. As the host matrix, the polymer blend consists of 70 wt.% of CS and 30 wt.% of MC. The interactions between the blend and the Mg(NO3)2 salt were revealed by FTIR analysis. The deconvolution of XRD peaks followed by the calculation of crystallinity indicates that the electrolyte samples were amorphous. The bulk resistance decreased with increasing salt content, according to the results of electrical impedance spectroscopy (EIS), and this was caused by the influence of carrier concentration. The sample containing 30 wt.% of Mg(NO3)2 was determined to have a maximum value of DC conductivity of 2.12 × 10–5 Scm−1 at room temperature by EIS analysis. The highest conducting film’s potential stability was found to be 3.65 V. It was found that the ion transference number was 0.86. The performance of the magnesium ion battery was then evaluated after it was built using the highest conducting polymer electrolyte. Considering this, the current work proposes an eco-friendly, practical, and affordable electrolyte appropriate for making electrochemical devices. Graphical abstract (made with biorender.com)

Structural, thermal and conductivity studies on Tamarind Gum based Magnesium ion conducting polymer membrane for Energy storage applications

“…The intensity of this stretching is decreased while increasing the salt concentration. The intensity variation observed for the peak at 2912 cm − 1 corresponds to CH 2 asymmetric stretching [17]. The vibrational peak noticed at 1643 cm − 1 is attributed to the C = C stretching.…”

“…In those peaks, 1320 cm − 1 to 1330 cm − 1 peaks belong to free ions and the peaks from 1395 cm − 1 to 1410 cm − 1 are observed due to contact ions [22]. Contact ion pairs are noticed at a higher wave number because the energy needed to produce them is more than that of the free anion [17]. The deconvoluted FTIR spectra are shown in Fig.…”

“…A report on biopolymer Agarose (0.5g) with 30% magnesium nitrate added electrolyte shows the extreme conductivity of 1.48×10 − 5 S/cm at ambient temperature [16]. The bio-polymer blend electrolyte Chitosan and Methylcellulose with magnesium nitrate added sample reached the maximum conductivity of 2.12×10 − 5 S/cm [17]. The synthetic polymer blend of PVA + PEG + Mg (NO) 3 system has attained a higher conductivity of 9.63×10 − 5 S/cm as reported by Anji Reddy Polu [18].…”

Preparation and characterization of polymer blend electrolyte membranes based on lithium acetate‐complexed carboxymethyl cellulose (CMC) and carboxymethyl chitosan (CMCh) blend

“…Number density (n), ionic mobility (μ), and diffusion coefficient (D) were calculated using the following Equations (5), (6), and (7), 14,29,34 respectively.…”

“…6,16,[20][21][22][23][24] If compared with single polymers, polymer blends offer advantages such as flexibility as amorphous increase consequences. [25][26][27][28][29][30][31] The electrolyte source used in the lithium-ion batteries system should have a high dielectric degree, high dissociation degree, and low lattice energy. Some lithium salts used are lithium hexafluorophosphate (LiPF 6 ), 32 lithium perchlorate (LiClO 4 ), 33,34 lithium bis(oxalato) borate (LiBOB), 35 lithium di(oxalato) borate LiDFOB, 36 lithium bis(trifluoromethane) sulfonyl imide (LiTFSI), 37 while lithium acetate (LiCH 3 COO) have never been many reported as electrolyte source.…”