Premium
Effect of Organic Solvents on the Electrochemical Performance of Sodium‐Ion Hybrid Capacitors
Author(s) -
Park MyungSoo,
Veerasubramani Ganesh Kumar,
Thangavel Ranjith,
Lee YunSung,
Kim DongWon
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801517
Subject(s) - ethylene carbonate , propylene carbonate , electrolyte , electrochemistry , dielectric spectroscopy , cyclic voltammetry , inorganic chemistry , ionic conductivity , materials science , diethyl carbonate , electrode , ionic liquid , conductivity , chemistry , chemical engineering , organic chemistry , catalysis , engineering
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 Na 3 V 2 (PO 4 ) 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 NaClO 4 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 .