Effect of Organic Solvents on the Electrochemical Performance of Sodium-Ion Hybrid Capacitors
- Authors
- Park, Myung-Soo; Veerasubramani, Ganesh Kumar; Thangavel, Ranjith; Lee, Yun-Sung; Kim, Dong-Won
- Issue Date
- Feb-2019
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- electrochemical performance; energy storage; liquid electrolyte; organic solvent; sodium-ion hybrid capacitor
- Citation
- CHEMELECTROCHEM, v.6, no.3, pp.653 - 660
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMELECTROCHEM
- Volume
- 6
- Number
- 3
- Start Page
- 653
- End Page
- 660
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/32904
- DOI
- 10.1002/celc.201801517
- ISSN
- 2196-0216
- 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).
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