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Kinetic Well-matched Full-carbon Sodium-ion Capacitor

Abstract

Sodium-ion capacitors (SICs), as the new-generation electrochemical energy-storage systems, have combined the advantages of high energy/power densities, meeting a urgent demand for versatile electronic equipments and grid energy-storage stations. Nevertheless, the electrochemical performance of SICs is seriously restricted by the kinetic mismatching of battery-type anode versus capacitor-type cathode. In this work, 3D carbon (NHPC) with N-doping delivers a high reversible specific capacity of 197 mAh g-1 at 2 A g-1, which is dominated by strong pseudocapacitive storage mechanism, serving as a prominent role for harmonizing the quick physical adsorption/desorption process. Moreover, through further activation of NHPC, the nitrogen-doped hierarchical porous activated carbon (NHPAC) displays a large specific surface area of 1478 m2 g-1 with abundant meso/macropores, bringing about the fast adsorption/desorption of the anion on the surface. Fundamentally, benefiting from the similar material system of anode/cathode, the full-carbon SIC device achieves a great energy density of 115 Wh kg-1 at 200 W kg-1 as well as marvelous long-term cyclability in the potential range of 0-4.0 V. This rational strategy of kinetic matching might open up a potential avenue for the advanced SICs.

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Supplementary files

Publication details

The article was received on 10 Apr 2019, accepted on 11 May 2019 and first published on 13 May 2019


Article type: Paper
DOI: 10.1039/C9TA03797G
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Kinetic Well-matched Full-carbon Sodium-ion Capacitor

    K. Zou, P. Cai, C. Liu, J. Li, X. Gao, L. Xu, G. Zou, H. Hou, Z. Liu and X. Ji, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA03797G

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