In the present work, polymer electrolyte (PE) film consisting of poly(vinyl alcohol) (PVA) with magnesium bromide (MgBr 2 ) as electrolytic salt, tetraethylene glycol dimethyl ether (TEGDME) as plasticizer and Li 2 O at different concentration (0.02, 0.04, 0.06 wt.%) as the filler has been prepared by solution casting technique. The polymeric film was flexible and self-standing with proper mechanical strength and studied for application in a solid-state rechargeable magnesium battery. The interactions between the filler and PVA chains are studied by X-ray and thermogravometric analyses. The conductivity increased with addition of filler reached to ∼ 10 −5 S · cm −1 at 0.04 wt.% Li 2 O. The frequency dependence of ac conductivity obeys Jonscher power law. The estimated value of Mg +2 ion transference number is found to be 0.7 for high conducting film. A solid state battery based on the optimum polymer electrolyte with a configuration Mg PE V 2 O 5 has exhibited an open circuit voltage of 1.5 V. Also this battery has exhibited a discharge capacity ≈ 6.11 mA h. The discharge characteristics are found to be satisfactory as a laboratory cell.
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 diraction and thermogravimetric analyses suggest a substantial structural modication, 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 PVAMgBr2 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 lm. The open circuit voltage of a solid state battery which based on the optimum polymer electrolyte with a conguration 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.
Rechargeable magnesium batteries have attractive features as a post-lithium battery owing to their high volumetric capacity, safety, and low cost. However, the high charge density of Mg2+ causes sluggish interfacial charge transfer kinetics at the electrode/electrolyte interface. This paper is an attempt to optimize the electrochemical performance of a halogen-free liquid electrolyte (HFE)-based magnesium nitrate (Mg(NO3)2) and variable additive of succinonitrile (SN). A polymer layer interface (PLI) consisting of Mg (CF3SO3)2, polyvinylidene fluoride (PVDF), SN, and G4 has been introduced to isolate the Mg anode's surface from HFE in order to reduce the growth rate of the passivation layer at the surface of the Mg anode. The introduction of SN regulates the ionic conductivity, overpotential of Mg plating/stripping, and the ion transference number of the HFE. A prototype of the Mg/HFE_SN/S full cell delivers a high initial discharge/charge capacity of ~ 1200/500 mAh g−1 with a rapid capacity fade, while (Mg/PLI/HFE_SN/S) cell offers low capacity with long cycle life over (Mg/HFE_SN/S) counterpart. Postmortem analysis of sulfur electrodes at different electrochemical states reveals the reversible back and forth movement of Mg2+ ions in Mg/S cells via conversion reaction.
Herein, magnesium-ion conducting polymer electrolytes (PE) based on polyvinylidene fluoride (PVDF), tetraethylene glycol dimethyl ether (TEGDME), succinonitrile (SN), and different concentrations of magnesium triflate salt ((CF3SO3)2Mg) were fabricated. The structural, optical, electrical, and electrochemical properties were investigated. The conductivity increases to about 10−5 S.cm−1 with increasing the concentration of (CF3SO3)2Mg up to 33 wt%, at room temperature. The ionic transference number for the matrix containing 33 wt% of (CF3SO3)2Mg increases from ( t m g + 2 = 0.4) to ( t M g + 2 = 0.8 ) with increasing the temperature comparatively from room temperature to 55 °C. Also, the cell with 33 wt% of (CF3SO3)2Mg shows low overpotential and steady Mg stripping/plating during the initial cycles at 55 °C. Polymer and dual electrolytes, as well as bare and modified Mg surface electrodes, are used to create Mg/S cells. The cell with a modified Mg surface electrode and dual electrolyte exhibit lower interfacial impedance, higher energy density, and charge-discharge capacity than the cell with a bare Mg electrode and polymer electrolyte.
In this study, we design a functional halogen-free electrolyte by linking its active species with a high polarity dimethyl sulfoxide to reduce the solvation barrier of Mg2+.
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