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Batteries 2018, 4(2), 28; https://doi.org/10.3390/batteries4020028

Ion Transport in Solvent-Free, Crosslinked, Single-Ion Conducting Polymer Electrolytes for Post-Lithium Ion Batteries

Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
These authors contributed equally to this work.
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Received: 14 May 2018 / Revised: 31 May 2018 / Accepted: 6 June 2018 / Published: 7 June 2018
(This article belongs to the Special Issue Recent Advances in Post-Lithium Ion Batteries)
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Abstract

Solvent-free, single-ion conducting electrolytes are sought after for use in electrochemical energy storage devices. Here, we investigate the ionic conductivity and how this property is influenced by segmental mobility and conducting ion number in crosslinked single-ion conducting polyether-based electrolytes with varying tethered anion and counter-cation types. Crosslinked electrolytes are prepared by the polymerization of poly(ethylene glycol) diacrylate (PEGDA), poly(ethylene glycol) methyl ether acrylate, and ionic monomers. The ionic conductivity of the electrolytes is measured and interpreted in the context of differential scanning calorimetry and Raman spectroscopy measurements. A lithiated crosslinked electrolyte prepared with PEG31DA and (4-styrenesulfonyl)(trifluoromethanesulfonyl)imide (STFSI) monomers is found to have a lithium ion conductivity of 3.2 × 10−6 and 1.8 × 10−5 S/cm at 55 and 100 °C, respectively. The percentage of unpaired anions for this electrolyte was estimated at about 23% via Raman spectroscopy. Despite the large variances in metal cation–STFSI binding energies as predicted via density functional theory (DFT) and large variations in ionic conductivity, STFSI-based crosslinked electrolytes with the same charge density and varying cations (Li, Na, K, Mg, and Ca) were estimated to all have unpaired anion populations in the range of 19 to 29%. View Full-Text
Keywords: polymer electrolyte; single-ion conducting; ionic conductivity; Raman spectroscopy polymer electrolyte; single-ion conducting; ionic conductivity; Raman spectroscopy
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Elmore, C.T.; Seidler, M.E.; Ford, H.O.; Merrill, L.C.; Upadhyay, S.P.; Schneider, W.F.; Schaefer, J.L. Ion Transport in Solvent-Free, Crosslinked, Single-Ion Conducting Polymer Electrolytes for Post-Lithium Ion Batteries. Batteries 2018, 4, 28.

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