Ionic conductivity and molecular dynamic behavior in supramolecular ionic networks; The effect of lithium salt addition

TY - JOUR

T1 - Ionic conductivity and molecular dynamic behavior in supramolecular ionic networks; The effect of lithium salt addition

AU - Aboudzadeh, M. Ali

AU - Zhu, Haijin

AU - Pozo-Gonzalo, Cristina

AU - Shaplov, Alexander S.

AU - Mecerreyes, David

AU - Forsyth, Maria

N1 - Publisher Copyright: © 2015 Elsevier Ltd. All rights reserved.

PY - 2015/8/22

Y1 - 2015/8/22

N2 - Supramolecular ionic networks combine singular properties such as self-healing behaviour and ionic conductivity. In this work we present an insight into the ionic conductivity and molecular dynamic behaviour of an amorphous and semicrystalline supramolecular ionic networks (iNets) that were synthesised by self-assembly of difunctional imidazolium dicationic molecules coupled with (trifluoromethane-sulfonyl) imide dianionic molecules. Relatively low ionic conductivity values were obtained for the semicrystalline iNet below its melting point (Tm = 101 °C) in comparison with the amorphous iNet for which the conductivity significantly increased (∼3 orders of magnitude) above 100 °C. Upon LiTFSI doping, the semicrystalline iNet reached conductivity values ∼ 10-3 S cm-1 due to enhanced mobility of the network which was supported by solid-state static NMR. Furthermore, the overlapping of 19F and 7Li resonance lines from both the semicrystalline network and the LiTFSI suggests fast molecular motions.

AB - Supramolecular ionic networks combine singular properties such as self-healing behaviour and ionic conductivity. In this work we present an insight into the ionic conductivity and molecular dynamic behaviour of an amorphous and semicrystalline supramolecular ionic networks (iNets) that were synthesised by self-assembly of difunctional imidazolium dicationic molecules coupled with (trifluoromethane-sulfonyl) imide dianionic molecules. Relatively low ionic conductivity values were obtained for the semicrystalline iNet below its melting point (Tm = 101 °C) in comparison with the amorphous iNet for which the conductivity significantly increased (∼3 orders of magnitude) above 100 °C. Upon LiTFSI doping, the semicrystalline iNet reached conductivity values ∼ 10-3 S cm-1 due to enhanced mobility of the network which was supported by solid-state static NMR. Furthermore, the overlapping of 19F and 7Li resonance lines from both the semicrystalline network and the LiTFSI suggests fast molecular motions.

KW - Supramolecular materials

KW - ionic conductivity

KW - ionic liquids

KW - lithium

KW - solid-state NMR

UR - http://www.scopus.com/inward/record.url?scp=84940712292&partnerID=8YFLogxK

U2 - 10.1016/j.electacta.2015.02.064

DO - 10.1016/j.electacta.2015.02.064

M3 - 文章

AN - SCOPUS:84940712292

SN - 0013-4686

VL - 175

SP - 74

EP - 79

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -