Flexible Quasi-Solid-State Sodium-Ion Capacitors Developed Using 2D Metal-Organic-Framework Array as Reactor
Flexible Quasi-Solid-State Sodium-Ion Capacitors Developed Using 2D Metal-Organic-Framework Array as Reactor
复制标题
使用二维金属有机框架阵列作为反应器开发柔性准固态钠离子电容器
DOI：
10.1002/aenm.201702769
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发表时间：
2018
影响因子：
27.8
通讯作者：
Fan Hong Jin
中科院分区：
文献类型：
--
作者：
Xu Dongming;Chao Dongliang;Wang Huanwen;Gong Yansheng;Wang Rui;He Beibei;Hu Xianluo;Fan Hong Jin
实现高性能的钠离子电容器(NIC)面临着阳极和阴极之间的容量和动力学匹配的特殊挑战。本文报道了一种由二维金属有机骨架(MOFS)阵列构成的高功率NIC全器件作为反应模板。将MOF阵列转化为N掺杂介孔碳纳米片(MP-CNS)，然后将其均匀包裹在VO2和Na3V2(PO4)3(NVP)纳米粒子中作为电活性材料。通过该方法，能够显著提高电池材料的高功率性能。研究发现，这种混合NVP@MP-CNSS阵列具有超高倍率能力(高达200C，相当于18 S以内的放电)和优异的循环性能，超过了迄今报道的所有NVP基钠离子电池正极材料。进一步组装了基于NVP@MP-CNSS阴极和VO2@MP-CNSS阳极的准固态柔性NIC。这种混合NIC设备提供了高能量密度和功率密度，以及良好的循环稳定性(在1 A g−1下，2000次循环后保持率为78%)。结果表明，MOF阵列作为制备电极材料的反应器是有效的。
Achieving high‐performance Na‐ion capacitors (NICs) has the particular challenge of matching both capacity and kinetics between the anode and cathode. Here a high‐power NIC full device constructed from 2D metal–organic framework (MOFs) array is reported as the reactive template. The MOF array is converted to N‐doped mesoporous carbon nanosheets (mp‐CNSs), which are then uniformly encapsulated with VO2and Na3V2(PO4)3(NVP) nanoparticles as the electroactive materials. By this method, the high‐power performance of the battery materials is enabled to be enhanced significantly. It is discovered that such hybrid NVP@mp‐CNSs array can render ultrahigh rate capability (up to 200 C, equivalent to discharge within 18 s) and superior cycle performance, which outperforms all NVP‐based Na‐ion battery cathodes reported so far. A quasi‐solid‐state flexible NIC based on the NVP@mp‐CNSs cathode and the VO2@mp‐CNSs anode is further assembled. This hybrid NIC device delivers both high energy density and power density as well as a good cycle stability (78% retention after 2000 cycles at 1 A g−1). The results demonstrate the powerfulness of MOF arrays as the reactor for fabricating electrode materials.