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单离子Li⁺,Na⁺和Mg²⁺ 固体电解质由半孔离子酸金属有机框架支持

Sarah S Park¹, Yuri Tulchinsky¹, Mircea Dincă¹

¹Department of Chemistry, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society

|September 8, 2017

概括

这项研究引入了一种能够进行可逆相变的新型金属有机框架 (MOF),使固体电解质能够记录离子负载. 这些MOF显示出高离子导电性,进步了电池技术.

科学领域:

材料科学
无机化学
电化学

背景情况:

金属有机框架 (MOF) 为各种应用提供可调节的多孔结构.
开发高效的固态电解质对于下一代储能设备至关重要.
现有的基于MOF的电解质在离子导电性和负载能力方面面临挑战.

研究的目的:

合成和描述具有管状毛孔的新型Cu (II) 酸MOF.
调查MOF的可逆单晶到单晶过渡.
探索MOF作为Li+,Na+和Mg2+离子的高性能固态电解质的潜力.

主要方法:

单晶X射线衍射研究结构转变.
用化物/伪化物盐进行固体测量反应,以进行离子交换.
用Li+,Na+和Mg2+盐进行离子加载.
电化学阻抗光谱测量离子导电性.

主要成果:

成功合成了一种具有可逆相变的新型Cu (II) - 酸MOF.
MOF证明了创纪录数量的Li+,Na+和Mg2+离子.
由于1D孔内的静态离子和移动离子实现了单离子导电性.
达到的离子导电率为4.4 × 10^-5 S/cm (Li+),1.8 × 10^-5 S/cm (Na+) 和8.8 × 10^-7 S/cm (Mg2+).
在添加LiBF4时,Li+导电性增强到4.8 × 10^-4 S/cm.

结论:

新的MOF作为开发高性能固态电解质的高效平台.
可逆相位转换机制使其具有较高的离子负载能力.
观察到的离子导电率是迄今为止MOF固体电解质报告的最高值.
这项工作为基于MOF的先进储能应用铺平了道路.

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