Reversible deposition and dissolution of magnesium from BMIMBF4 ionic liquid

Reversible deposition and dissolution of magnesium from BMIMBF4 ionic liquid
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BMIMBF4离子液体中镁的可逆沉积和溶解

DOI:
10.1016/j.elecom.2005.07.013
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发表时间:
2005-11
期刊:
Electrochemistry Communication
影响因子:
--
通讯作者:
Rong Wu
Rong Wu
中科院分区:
其他
文献类型:
--
作者:
Yanna NuLi;Jun Yang;Rong Wu

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本文首次报道了在含1 M Mg(CF 3SO 3)2的离子液体BMIMBF 4中,镁在银衬底上的高度可逆沉积和溶解过程。在室温下,以0.1mA/cm ~ 2的电流密度对镁进行多次充放电循环,可获得数毫伏的稳态循环。循环伏安图也证明了可逆的镁沉积-溶解过程。在稳态Mg沉积期间的阻抗测量表示低的电化学阻抗,尽管该电阻在初始循环期间高。扫描电子显微镜(SEM)结果表明,多孔镁沉积层变得致密、结晶,沉积的镁可以完全电化学溶解,留下清洁、无膜的表面。电化学沉积镁的高可逆性将启发我们推测使用该电解质的二次镁电池的可行性。
In this paper, we reported for the first time the highly reversible magnesium deposition and dissolution processes on silver substrate in the ionic liquid of BMIMBF4with 1M Mg(CF3SO3)2. Stable-state cycles with several millivolts against magnesium at 0.1mA/cm2can be obtained during repeated charge-discharge cycling at room temperature. The cyclic voltammograms also demonstrated reversible magnesium deposition–dissolution processes. Impedance measurements during steady-state Mg deposition represented low electrochemical impedance, though this resistance was high during the initial cycling. Scanning electron microscopy (SEM) results showed that porous Mg deposition became compact and crystalline and the deposited magnesium could be completely dissolved electrochemically, leaving clean and film free surface. The high reversibility of the electrochemical magnesium deposition will inspire us to speculate about the feasibility of secondary magnesium batteries with the electrolyte.
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