Conductive 2D metal-organic framework for high-performance cathodes in aqueous rechargeable zinc batteries
Conductive 2D metal-organic framework for high-performance cathodes in aqueous rechargeable zinc batteries
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DOI：
10.1038/s41467-019-12857-4
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发表时间：
2019-10-30
影响因子：
16.6
通讯作者：
Stoddart, J. Fraser
中科院分区：
文献类型：
--
作者：
Nam, Kwan Woo;Park, Sarah S.;Stoddart, J. Fraser
目前，人们对开发先进的可再充电电池有相当大的兴趣，这些电池具有高效的电力分配和用于大规模储能系统的经济可行性。可再充电的水性锌电池在倍率性能、成本和安全性方面是锂离子电池的有前途的替代品。在这项研究中，我们采用Cu-3（HHTP）（2），一种具有大的一维通道的二维（2D）导电金属有机框架（MOF），作为锌电池阴极。由于其独特的结构，水合Zn 2+离子直接插入到主体结构Cu-3（HHTP）（2）中，允许高扩散速率和低界面电阻，这使得Cu-3（HHTP）2阴极遵循嵌入赝电容机制。Cu-3（HHTP）（2）在50 mA g（-1）下表现出228 mAh g（-1）的高可逆容量。在4000 mA g（-1）（-18 C）的高电流密度下，在500次循环后保持初始容量的75.0%。这些结果为电池电极的高性能2D导电MOF设计提供了关键见解。
Currently, there is considerable interest in developing advanced rechargeable batteries that boast efficient distribution of electricity and economic feasibility for use in large-scale energy storage systems. Rechargeable aqueous zinc batteries are promising alternatives to lithium-ion batteries in terms of rate performance, cost, and safety. In this investigation, we employ Cu-3(HHTP)(2), a two-dimensional (2D) conductive metal-organic framework (MOF) with large one-dimensional channels, as a zinc battery cathode. Owing to its unique structure, hydrated Zn2+ ions which are inserted directly into the host structure, Cu-3(HHTP)(2), allow high diffusion rate and low interfacial resistance which enable the Cu-3(HHTP) 2 cathode to follow the intercalation pseudocapacitance mechanism. Cu-3(HHTP)(2) exhibits a high reversible capacity of 228 mAh g(-1) at 50 mA g(-1). At a high current density of 4000 mA g(-1) (-18 C), 75.0% of the initial capacity is maintained after 500 cycles. These results provide key insights into high-performance, 2D conductive MOF designs for battery electrodes.