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Effect of Organic Solvents on the Electrochemical Performance of Sodium-Ion Hybrid Capacitors

Title
Effect of Organic Solvents on the Electrochemical Performance of Sodium-Ion Hybrid Capacitors
Author
김동원
Keywords
electrochemical performance; energy storage; liquid electrolyte; organic solvent; sodium-ion hybrid capacitor
Issue Date
2019-02
Publisher
WILEY-V C H VERLAG GMBH
Citation
CHEMELECTROCHEM, v. 6, NO 3, Page. 653-660
Abstract
A comparative study on the ionic conductivity of carbonate- and ether-based electrolytes was performed, which showed that the ionic conductivity was strongly affected by the dielectric constant of the organic solvent. The relationship between the physicochemical properties of a liquid electrolyte and the cycling performance of sodium-ion hybrid capacitors (SICs) was assessed by comparing the electrochemical characteristics of SICs assembled with a negative activated carbon electrode and a positive Na3V2(PO4)(3) electrode. Cyclic voltammetry, leakage current measurements, and electrochemical impedance spectroscopy results demonstrated that the good cycling performance of SICs with carbonate-based electrolytes can be ascribed to their superior electrochemical stability, large amounts of free ions, and favorable electrochemical reaction kinetics. An SIC employing an electrolyte consisting of 1.0 M NaClO4 in ethylene carbonate/propylene carbonate exhibited a good rate capability and delivered a high initial discharge capacity of 98.7 mAh g(-1) with a capacity retention of 90.8% after 1000 cycles at a constant current density of 500 mA g(-1).
URI
https://onlinelibrary.wiley.com/doi/full/10.1002/celc.201801517http://repository.hanyang.ac.kr/handle/20.500.11754/108386
ISSN
2196-0216
DOI
10.1002/celc.201801517
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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