Ionic liquid/tetraglyme hybrid Mg[TFSI]_2 electrolytes for rechargeable Mg batteries

作     者：Zheng Ma Maria Forsyth Douglas R.MacFarlane Mega Kar 

作者机构：School of Chemistry Faculty of Science Monash University ARC Centre of Excellence for Electromaterials Science IFM – Institute for Frontier Materials Deakin University 

出 版 物：《Green Energy & Environment》 (绿色能源与环境（英文版）)

年 卷 期：2019年第4卷第2期

页      面：146-153页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：support from the Australian Research Council for his Australian Laureate Fellowship 

主　　题：Mg[TFSI]2 Ionic liquids Tetraglyme Rechargeable Mg battery Mg[BH4]2 dehydrate reagent 

摘      要：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 [C4 mpyr][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℃ for this electrolyte suggesting that the presence of the ionic liquid increases thermal stability substantially making these hybrid electrolytes compatible for RMBs.