Biopolymer Electrolyte Based on Gellan Gum With Magnesium Chloride for Magnesium Battery

Abstract Eco-Friendly, non-toxic and biodegradable natural biopolymer electrolyte, Gellan Gum with Magnesium Chloride has been prepared by solution casting technique. The prepared biopolymer electrolyte has been characterized by XRD, FTIR, DSC and AC impedance analysis techniques. XRD study is used to analyze amorphous nature/crystalline nature of the polymer electrolyte. Complex formation between Gellan Gum and magnesium chloride salt has been studied by FTIR technique. The glass transition temperature (Tg) of the polymer electrolytes are obtained by DSC measurement. The highest ionic conductivity 2.91×10− 2 Scm− 1 has been obtained for electrolyte of 1.0 g Gellan Gum with 0.5 M.wt% MgCl2 from AC impedance analysis at room temperature. Transference number 0.97 has been obtained by Wagner’s polarization method for high conducting sample. The Mg2+ cationic transport number 0.35 has been found by Evan’s method for high conducting sample. Magnesium ion conducting battery has been constructed using the high conducting polymer electrolyte. Its open circuit voltage 2.39 V and the battery discharge characteristics are studied.

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Studies on Composite PVA-CA-NH4CF3SO3-Al2O3 Polymer Electrolyte for Electrochemical Devices

Asian Journal of Chemistry ◽

10.14233/ajchem.2019.21922 ◽

2019 ◽

Vol 31 (5) ◽

pp. 1181-1188 ◽

Cited By ~ 1

Author(s):

S. Gurulakshmi ◽

S. Madeswaran ◽

S. Karthikeyan ◽

V. Porchezhiyan

Keyword(s):

Polymer Electrolyte ◽

Transference Number ◽

Impedance Analysis ◽

Ac Impedance ◽

Open Circuit ◽

Poly Vinyl Alcohol ◽

Scanning Calorimetry ◽

Composite Electrolyte ◽

Ac Impedance Analysis ◽

Electrochemical Devices

In the present study, polymer electrolyte with poly(vinyl alcohol) (PVA) blended with cellulose acetate (CA) was chosen to prepare composite electrolyte using ammonium triflate salt and nano sized alumina (Al2O3- < 50 nm) by the solution casting method. The as prepared samples were characterized by X-ray diffraction, FT-IR, differential scanning calorimetry and AC impedance spectra. The loss tangent and dielectric studies were carried out for all the prepared samples using AC impedance analysis. Activation energy with regression values and relaxation time were calculated and found to be low for the highest conducting membranes. The presence of 0.1 mol content of nano alumina has enhanced the ionic conductivity significantly to the value of 2.012 × 10-3 S/cm from that of the filler-free electrolyte (2.93 × 10-4 S/cm). Ionic transference number was calculated by electrostatic polarization method and it was found to be 0.9684, which shows the conducting species were ions. A proton battery fabricated using the configuration Zn+ZnSO4. H2O || PVA-CA-0.5 mol NH4CF3SO3-0.1 mol Al2O3 || PbO2 + V2O5 produced a steady state open circuit voltage of 1.39 V, which proves the prepared composite electrolyte is suitable solid electrolyte for electrochemical devices.

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