Effect of Tetraethylene Glycol Dimethyl Ether on Electrical, Structural and Thermal Properties of PVA-Based Polymer Electrolyte for Magnesium Battery

The aim of the contribution is to introduce a high performance magnesium conducting polymer electrolytes (PEs) comprising hybrid of poly(vinyl alcohol) (PVA), magnesium bromide (MgBr2) and tetraethylene glycol dimethyl ether (TEGDME) as plasticizer are prepared at various compositions by solution cast technique. X-ray di raction and thermogravimetric analyses suggest a substantial structural modi cation, decrease in crystallinity and various interactions in the polymer electrolyte components due to addition of TEGDME. Also there is a marked decrease in Tg with increasing TEGDME. The conductivity conformation with the addition of plasticizer which can be explained on the basis of dissociation of ion aggregates formed in PVA MgBr2 polymer electrolytes at higher concentrations of the salt. The ionic conductivity of the polymer electrolyte increased with addition of salt and plasticizer reached to the highest conductivity value of ≈10−6 S cm−1 at 0.8 ml TEGDME. The frequency dependence of AC conductivity obeys the Jonscher power law. The estimated value of Mg ion transference number is found to be 0.68 for high conducting lm. The open circuit voltage of a solid state battery which based on the optimum polymer electrolyte with a con guration Mg|PE|V2O5 is 1.5 V. Also this battery has exhibited a discharge capacity ≈ 3.78 mAh/g. The discharge characteristics are found to be satisfactory as a laboratory cell.