Carbon Necklace Incorporated Electroactive Reservoir Constructing Flexible Papers for Advanced Lithium-Ion Batteries
Carbon Necklace Incorporated Electroactive Reservoir Constructing Flexible Papers for Advanced Lithium-Ion Batteries
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Carbon Necklace 结合电活性储层构建先进锂离子电池柔性纸
DOI：
10.1002/smll.201702770
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发表时间：
2018-01-11
期刊：
影响因子：
13.3
通讯作者：
Huang, Wei
中科院分区：
文献类型：
--
作者：
Du, Min;Rui, Kun;Huang, Wei
金属有机骨架及其衍生物具有良好的结构和组成，在传感器、催化、储能和转换等领域显示出巨大的应用潜力。然而，较差的导电性和较大的体积膨胀是其在锂离子电池和超级电容器等储能领域应用的主要障碍。在此，提出了一种简便的策略，将ZIF-67和MIL-88等MOF嵌入到聚丙烯腈纤维中，并以其为模板构建三维互联导电碳链纸。由于具有良好的导电性、相互连接的骨架、电活性储存池和双掺杂等独特的结构特征，不添加任何添加剂的柔性电极具有高的比容量、良好的倍率性能和较长的循环稳定性。中空十二面体ZIF-67衍生碳素项链纸具有1200 mAhg(-1)的高比容量和超过400次循环的卓越稳定性，而容量不会衰减。此外，纺锤形MIL-88衍生碳项链纸的可逆容量高达980mAHg(-1)。其独特的3D互连结构和优异的电化学性能为MOF基交织材料在便携式和可穿戴电子设备中的潜在应用铺平了道路。
Metal-organic frameworks (MOFs) and their derivatives with well-defined structures and compositions show great potential for wide applications such as sensors, catalysis, energy storage, and conversion, etc. However, poor electric conductivity and large volume expansion are main obstacles for their utilization in energy storage, e.g., lithium-ion batteries and supercapacitors. Herein, a facile strategy is proposed for embedding the MOFs, e.g., ZIF-67 and MIL-88 into polyacrylonitrile fibers, which is further used as a template to build a 3D interconnected conductive carbon necklace paper. Owing to the unique structure features of good electric conductivity, interconnected frameworks, electroactive reservoir, and dual dopants, the obtained flexible electrodes with no additives exhibit high specific capacities, good rate capability, and prolonged cycling stability. The hollow dodecahedral ZIF-67 derived carbon necklace paper delivers a high specific capacity of 1200 mAh g(-1) and superior stability of more than 400 cycles without capacity decay. Moreover, the spindle-like MIL-88 derived carbon necklace paper shows a high reversible capacity of 980 mAh g(-1). Their unique 3D interconnected structure and outstanding electrochemical performance pave the way for extending the MOF-based interweaving materials toward potential applications in portable and wearable electronic devices.