Ionic liquid/tetraglyme hybrid Mg[TFSI]2 electrolytes for rechargeable Mg batteries
Ionic liquid/tetraglyme hybrid Mg[TFSI]2 electrolytes for rechargeable Mg batteries
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DOI：
10.1016/j.gee.2018.10.003
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发表时间：
2019-04-01
影响因子：
13.3
通讯作者：
Kar, Mega
中科院分区：
文献类型：
--
作者：
Ma, Zheng;Forsyth, Maria;Kar, Mega
研究了镁在离子液体和甘醇二甲醚有机溶剂混合电解质中的电化学可逆性。电解质仅在用脱水剂硼氢化镁Mg[BH 4]（2）预处理后才显示出Mg的可逆还原和氧化，突出了去除Mg基电解质中的水的重要性。将镁二[双（三氟甲磺酰基）酰亚胺]（Mg[TFSI]（2））（0.3M）以1：2的摩尔比添加到N-丁基-n-甲基-吡咯烷钥双（三氟甲磺酰基）酰亚胺[C4 mpyr][TFSI]/四甘醇二甲醚中显示出在几乎300个循环内的稳定CV循环，而扫描电子显微镜（SEM）和X射线衍射（XRD）证实了Mg沉积，显示出非树枝状形态和良好排列的生长。进一步的热重分析（TGA）表明该电解质在250 ℃下的质量保持率为79%，表明离子液体的存在增加了热稳定性，基本上使这些混合电解质与RMB相容。(C)2018年，中国科学院过程工程研究所。出版社：Elsevier B. V.
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[BH4](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 degrees C for this electrolyte suggesting that the presence of the ionic liquid increases thermal stability substantially making these hybrid electrolytes compatible for RMBs. (C) 2018, Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V.