Premium
Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor
Author(s) -
Xu Dongming,
Chao Dongliang,
Wang Huanwen,
Gong Yansheng,
Wang Rui,
He Beibei,
Hu Xianluo,
Fan Hong Jin
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201702769
Subject(s) - materials science , anode , cathode , battery (electricity) , power density , capacitor , electrode , mesoporous material , quasi solid , nanoparticle , chemical engineering , nanotechnology , optoelectronics , voltage , power (physics) , electrical engineering , chemistry , catalysis , organic chemistry , electrolyte , dye sensitized solar cell , engineering , physics , quantum mechanics
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 VO 2 and Na 3 V 2 (PO 4 ) 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 VO 2 @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.