一个导电的离子金属有机框架
Darsi Rambabu1, Alae Eddine Lakraychi1, Jiande Wang1
1Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium.
Journal of the American Chemical Society
|July 26, 2021
概括
研究人员开发了电导离子 (Li-ion) 金属有机框架 (MOF) 阴极. 这些新型MOF表现出增强的氧化还原活性和导电性,为先进的储能解决方案铺平了道路.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 金属有机框架 (MOF) 对电化学储能具有前景,但缺乏电活性的化学原理.
- 合成离子MOF与阳体储存和可逆氧化还原能力仍然是一个重大挑战.
研究的目的:
- 设计和合成具有可调的化学和结构性质的导电离子MOF阴极.
- 研究MOF组成,二级建筑单元 (SBU) 拓和电化学性能之间的关系.
主要方法:
- 在CPO-27原型MOF中合理控制连接到过渡金属固体测量和SBU拓.
- 合成Li2-M-DOBDC (M=Mg2+或Mn2+) 的材料
- 电化学表征包括氧化还原潜力,导电性测量和循环稳定性测试.
主要成果:
- 实现了导电性离子MOF (Li2-M-DOBDC) 阴极,电导率增加了一百万倍 (对于Li2-Mn-DOBDC,最高可达10−7 S/cm).
- 将DOBDC4−链接器的氧化还原潜力增加到3.2 V与Li+/Li0.
- 作为阴极材料的Li2-Mn-DOBDC在100个循环中表现出良好的容量保留和快速循环速度.
结论:
- 通过精确的组成和SBU设计验证了MOF中可逆氧化还原活性和电子导电性的概念.
- 2-M-DOBDC材料代表了基于MOF的电化学能量存储的重大进步.
- 开发的MOF在离子电池组装和性能方面具有实用优势.
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