Preprint Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 14 May 2018 / Approved: 15 May 2018 / Online: 15 May 2018 (08:45:58 CEST)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Batteries 2018, 4, 28
DOI: 10.3390/batteries4020028

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 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 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%.

Subject Areas

polymer electrolyte; single-ion conducting; ionic conductivity; Raman spectroscopy

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