Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor |
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| Authors: | Dongming Xu Dongliang Chao Huanwen Wang Yansheng Gong Rui Wang Beibei He Xianluo Hu Hong Jin Fan |
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| Affiliation: | 1. Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, China;2. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore;3. State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, China |
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| Abstract: | 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 VO2 and 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. |
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| Keywords: | asymmetric supercapacitors hybrid batteries metal– organic frameworks Na3V2(PO4)3 sodium‐ion capacitors |
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