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Affiliation of Author(s):材料科学与技术学院

Journal:J. Mater. Chem. A

Abstract:The Na-ion hybrid capacitor (NIC) has exhibited its potential applications for devices that need high energy and power densities with low cost. Nevertheless, due to their "Daniell-type" mechanism, conventional NIC devices require massive electrolytes to provide a good ionic conductivity during charging, which could decrease the packaged energy density. Herein, we report a novel "Rocking-Chair" Na-ion hybrid capacitor (RC-NIC) employing Na-ions as charge carriers, Na3V2O2(PO4)2F@PEDOT as the cathode material and activated carbon (AC) as the anode material. RC-NIC efficiently improves the energy density by minimizing the amount of electrolyte like secondary batteries because Na-ion is de-intercalated from the cathode while it is adsorbed to the anode during charging. The Na3V2O2(PO4)2F@PEDOT//AC (peanut shell derived carbon) RC-NIC delivers high energy density of ∼158 W h kg-1 and power density of ∼7000 W kg-1 based on the total mass of active materials in both electrodes, respectively, in the voltage window of 1.0-4.2 V. This is one of the highest energy densities among the previously reported NICs. This concept provides a new route to build sodium-ion hybrid capacitors that meet dual criteria of battery and supercapacitor characters. © 2019 The Royal Society of Chemistry.

ISSN No.:2050-7488

Translation or Not:no

Date of Publication:2019-01-01

Co-author:Wu, Langyuan,Dong, Shengyang,Pang, Gang,Li, Hongsen,Xu, Chengyang,Zhang, Yadi,Zhang Xiaogang

Correspondence Author:Dou Hui