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2015 | 127 | 3 | 803-810
Article title

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

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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 (MgBr_2) and tetraethylene glycol dimethyl ether (TEGDME) as plasticizer are prepared at various compositions by solution cast technique. X-ray diffraction and thermogravimetric analyses suggest a substantial structural modification, decrease in crystallinity and various interactions in the polymer electrolyte components due to addition of TEGDME. Also there is a marked decrease in T_{g} 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-MgBr_2 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^{+2} ion transference number is found to be 0.68 for high conducting film. The open circuit voltage of a solid state battery which based on the optimum polymer electrolyte with a configuration Mg|PE|V_2O_5 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.
Physical description
  • Physics Department, Faculty of Science, Benha University, Benha, Egypt
  • Physics Department, Faculty of Science, Benha University, Benha, Egypt
  • Physics Department, Faculty of Science, Benha University, Benha, Egypt
  • Physics Department, Faculty of Science, Benha University, Benha, Egypt
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