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在先进的Mg电池电解质溶液中Al和Mg的相互作用

Kimberly A See¹, Karena W Chapman², Lingyang Zhu¹

¹Department of Chemistry, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.

Journal of the American Chemical Society

|December 5, 2015

概括

电池提供可持续的储能. 通过调节合金复合物 (MACC) 电解质,通过形成特定的复合物和自由离子来激活沉积.

科学领域:

材料科学
电化学
无机化学

背景情况:

电池是离子电池的可持续替代品,具有更高的容量.
由于沉积效率和稳定性高,化复合物 (MACC) 电解质对Mg电池具有前景.
作为制备的MACC电解质对Mg沉积是不活跃的,需要一个激活过程.

研究的目的:

确定在条件化MACC电解质中负责电沉积的活性复合物.
在MACC电解质调节过程中阐明和物种的关系.
了解离子在增强电沉积中的作用.

主要方法:

用于振动分析的拉曼光谱和表面增强的拉曼光谱 (SERS).
(27) Al和 (35) Cl核磁共振 (NMR) 光谱用于元素物种化.
对于结构洞察的对分布函数 (PDF) 分析.

主要成果:

在准备和调节的MACC电解质之间观察到大量物种化的显著变化.
条件化MACC中的活性Mg复合物可能是[Mg2{\displaystyle {\mathcal {Mg2}}}-μ-Cl) 3·6THF}{\displaystyle {\mathcal {Mg2}}}+) 复合物.
电解调节产生溶液中的自由离子 (Cl-).

结论:

调节将MACC电解质转化,使得高效的沉积成为可能.
[Mg2 ((μ-Cl) 3·6THF)) 复合物被确定为Mg电沉积的关键活性物种.
自由离子可能会吸附到电极表面,促进Mg沉积.

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