Abstract
Effect of fumed silica dispersion on poly(vinylidene fluoride-co-hexafluoropropylene)-based magnesium ion-conducting gel polymer electrolyte has been studied using various physical and electrochemical techniques. The composite gel electrolytes are free-standing and flexible films with enough mechanical strength. The optimized composition with 3 wt.% filler offers a maximum ionic conductivity of ∼1.1 × 10−2 S cm−1 at ∼25 °C with good thermal and electrochemical stabilities. The Mg2+ ion conduction in the gel nanocomposite film is confirmed from the cyclic voltammetry, impedance spectroscopy, and transport number measurements. The space-charge layers formed between filler particles and gel electrolyte are responsible for the enhancement in ionic conductivity. The applicability of the gel nanocomposite to a rechargeable battery is examined by fabricating a prototype cell consisting of Mg [or Mg-multiwalled carbon nanotube (MWCNT) composite] and MoO3 as negative and positive electrodes, respectively. The discharge capacity and the rechargeability of the cell have been improved when Mg metal is substituted by Mg-MWCNT composite. The discharge capacity of the optimized cell has found to be ∼175 mAh g−1 of MoO3 for an initial ten charge–discharge cycles.
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Acknowledgments
Authors acknowledge the financial supports received from the Council of Scientific and Industrial Research (CSIR), New Delhi (Sanction No.: 03(1069)/06/EMR-II, 2006) and University of Delhi (under the Scheme 11-17 Research Fund). GPP is grateful to the Council of Scientific and Industrial Research (CSIR), New Delhi for the award of Research Associateship.
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Pandey, G.P., Agrawal, R.C. & Hashmi, S.A. Magnesium ion-conducting gel polymer electrolytes dispersed with fumed silica for rechargeable magnesium battery application. J Solid State Electrochem 15, 2253–2264 (2011). https://doi.org/10.1007/s10008-010-1240-4
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DOI: https://doi.org/10.1007/s10008-010-1240-4