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电化学  2012 

(PhMgCl)2-AlCl3在混合醚溶剂中的电化学性能研究

, PP. 56-61

Keywords: 电解液,蒸汽压,可逆镁沉积,可充镁电池

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Abstract:

制备了全苯基有机铝镁盐(PhMgCl)2-AlCl3,研究以3种不同混合醚,即dimethoxyethane(DME)+THF、Diglyme(DG)+THF和Tetraglyme(TG)+THF作溶剂对全苯基有机铝镁盐在不同金属电极上的电化学性能的影响.结果表明,和(PhMgCl)2-AlCl3/THF体系相比,(PhMgCl)2-AlCl3/DG+THF(3:2)仍具有较高的离子电导率(1.605×10-3S?cm-1)、良好的可逆沉积镁特性及阳极抗氧化性能(电化学窗口大于2.8V).且该DG+THF混合溶剂还可大幅降低电解液的饱和蒸汽压(由23.46kPa降低到9.41kPa),减少了电池使用过程电解液的挥发,从而提高了可充镁电池的安全性能.比较Pt、Ni、Cu和Al等不同金属基质电极,发现Pt的电化学性能最好,而Al最差.

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