期刊
CHEMELECTROCHEM
卷 6, 期 3, 页码 653-660出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201801517
关键词
electrochemical performance; energy storage; liquid electrolyte; organic solvent; sodium-ion hybrid capacitor
资金
- National Research Foundation of Korea (NRF) - Korea government (Ministry of Science, ICT & Future Planning) [2016R1A4A1012224]
- Industrial Promotion Program of Economic Cooperation Area of MOTIE/KIAT [R0004005]
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).
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