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Ionic liquid/tetraglyme hybrid Mg[TFSI] 2 electrolytes for rechargeable Mg batteries

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journal contribution
posted on 01.04.2019, 00:00 authored by Z Ma, Maria ForsythMaria Forsyth, D R MacFarlane, Mega KarMega Kar
© 2018 The electrochemical reversibility of Mg in hybrid electrolytes based on mixtures of ionic liquid and glyme based organic solvents was investigated for applications in rechargeable magnesium batteries (RMBs). The electrolytes demonstrate reversible reduction and oxidation of Mg only after being pre-treated with the dehydrating agent, magnesium borohydride, Mg[BH 4 ] 2 , highlighting the importance of removing water in Mg based electrolytes. The addition magnesium di[bis(trifluoromethanesulfonyl)imide] (Mg[TFSI] 2 ) (0.3 M) to N-butyl-n-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide [C4mpyr][TFSI]/tetraglyme at a mole ratio of 1:2 showed stable CV cycling over almost 300 cycles while scanning electron microscopy (SEM) and X-ray diffraction (XRD) confirmed Mg deposition, showing non-dendritic morphology and a well-aligned growth. Further thermogravimetric analysis (TGA) demonstrated a mass retention of 79% at 250 °C for this electrolyte suggesting that the presence of the ionic liquid increases thermal stability substantially making these hybrid electrolytes compatible for RMBs.

History

Journal

Green Energy and Environment

Volume

4

Issue

2

Pagination

146 - 153

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

2096-2797

eISSN

2468-0257

Language

eng

Publication classification

C1 Refereed article in a scholarly journal