Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 18, Issue 10, Pages 2683-2691Publisher
SPRINGER
DOI: 10.1007/s10008-014-2526-8
Keywords
Rechargeable zinc batteries; Polymer gel electrolyte; Ionic liquid; Galvanostatic cycling
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Funding
- BMBF project AKUZIL
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In this paper, we report on zinc deposition and stripping in an ionic liquid polymer gel electrolyte on gold and copper substrates, respectively. The ionic liquid-based polymer gel electrolyte is prepared by combining the ionic liquid 1-butyl-1-methylpyrrolidinium trifluoromethylsulfonate ([Py-1,Py-4]TfO), with Zn(TfO)(2) and poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP). The ionic liquid polymer gel electrolyte exhibits good conductivity (2.2 mS cm(-1)) and good mechanical stability. Zinc deposition and stripping in the ionic liquid polymer gel electrolyte were studied by cyclic voltammetry, potentiostatic, and galvanostatic cycling (charging/discharging) experiments. The gel electrolyte exhibits a promising electrochemical stability and allows a quasi-reversible zinc deposition/stripping. The morphology of the zinc deposits after 10 cycles of zinc deposition/stripping is compact and dense, and deposits without any dendrite formation can be obtained. The quasi-reversibility of the electrochemical deposition/stripping of zinc in this ionic liquid polymer gel electrolyte is of interest for rechargeable zinc-based batteries.
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