US EPA

4843409 

Journal Article 

Vinylene Carbonate as Co-Solvent for Low-Temperature Mixed Electrolyte Based Supercapacitors 

Vaeli, R; Jaenes, A; Lust, E 

2016 

1 

Journal of Electrochemical Society
ISSN: 0013-4651
EISSN: 1945-7111 

163 

6 

A851-A857 

10.1149/2.0541606jes 

WOS:000373985300101 

The electrochemical characteristics of supercapacitors consisting of molybdenum carbide derived carbon C(Mo2C) electrodes in 1M NaPF6 solutions in various mixtures (0.5-5%) of vinylene carbonate (VC) with propylene carbonate (PC) and ethyl acetate (EA) (1: 1 by volume) have been studied using cyclic voltammetry, constant current charging/discharging and electrochemical impedance spectroscopy methods. The specific capacitance and series resistance values dependencies on the used solvent mixture and applied temperature (from -40 degrees C to 60 degrees C) have been established. The region of ideal polarizability has been established for C(Mo2C) electrodes in all electrolytes and temperatures investigated, except at T >= 40 degrees C. Specific conductivity values have been measured and correlated with electrochemistry data. Limiting capacitance, calculated characteristic time constant and complex power values depend noticeably on the solvent mixture used in the electrolyte, i.e. on the viscosity and specific conductivity of the electrolyte solution. The studied electrolytes are potential candidates for low-temperature supercapacitors. (C) The Author(s) 2016. Published by ECS. All rights reserved.