Effect of Organic Solvents on the Electrochemical Performance of Sodium‐Ion Hybrid Capacitors. Issue 3 (19th December 2018)

• Record Type: Journal Article
• Authors: Park, Myung‐Soo; Veerasubramani, Ganesh Kumar; Thangavel, Ranjith; Lee, Yun‐Sung; Kim, Dong‐Won
• Is Part Of: ChemElectroChem. Volume 6:Issue 3(2019)
• Page Start: 653
• Page End: 660
• Publication Date: 2018-12-19
• Subjects: electrochemical performance -- energy storage -- liquid electrolyte -- organic solvent -- sodium-ion hybrid capacitor; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201801517
• Languages: English
• ISSNs: 2196-0216

Abstract

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 Na3 V2 (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 . Abstract : A sodium‐ion hybrid capacitor composed of an activated carbon anode and an Na3 V2 (PO4 )3 cathode employing 1.0 M NaClO4 in ethylene carbonate /propylene carbonate exhibits the best cycling performance in terms of reversible capacity, cycling stability, and rate capability.