作为固态电解质的有机顶点和多氧金属链的金属有机框架
Wentao Xu1, Xiaokun Pei1, Christian S Diercks1
1Department of Chemistry , University of California-Berkeley ; Materials Sciences Division, Lawrence Berkeley National Laboratory; and Kavli Energy NanoSciences Institute, Berkeley , California 94720 , United States.
Journal of the American Chemical Society
|October 24, 2019
概括
一个新的金属有机框架 (MOF),MOF-688,显示出出色的离子导电性和稳定性. 这使得它成为在室温下运行的先进金属电池的有前途的固态电解质.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 金属有机框架 (MOF) 为各种应用提供可调节的结构.
- 固态电解质对于更安全,更高效的金属电池至关重要.
- 开发稳定和导电的固体电解质仍然是电池技术的关键挑战.
研究的目的:
- 合成和描述一个新的三维金属有机框架 (MOF).
- 研究合成的MOF作为金属电池的固态电解质的潜力.
- 评估基于MOF的电解质的离子导电性和电化学性能.
主要方法:
- 通过聚氧甲和四甲结合剂的胺凝合成MOF-688.
- 使用单晶X射线衍射来确定结构.
- 一个金属电池原型的离子导电性测量和电化学循环.
主要成果:
- MOF-688呈现出三次透的基于钻石的 (介面) 拓.
- 在MOF-688中离子交换产生高离子导电性 (3.4 × 10−4 S cm−1 在20°C) 和高转移数 (t Li+ = 0.87).
- 使用MOF-688作为固体电解质的原型电池在室温下表现出稳定的循环,实际电流密度为~0.2°C.
结论:
- MOF-688是一种稳定且极具导电性的固态电解质.
- 它的性能,包括较低的接口电阻,使其适合金属电池.
- 这种MOF代表了储能固体电解质材料的重大进步.
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