Supercapacitors with Extended Operating Potential Window

Abstract:

Electrolytes in supercapacitors (SCs) play an important role on their energy storage capacity. The electrochemical stability of electrolytes defines the operating potential of the SCs and their viscosity defines a power density of the SCs. In the present work, a new method for composing an electrochemically stabile but high viscous ethylene glycol (EG) based electrolyte has been discussed. A viscosity of the EG then reduced by dissolving an inorganic lithium tetrafluoroborate (LiBF₄) salt. The affect of the concentration of the salt on EG viscosity has been investigated. The best capacitive performance of activated carbon (AC) based electrodes with large operating potential (-1.7V to 1.7V) was found in 3M LiBF₄/EG electrolyte.

• Periodical: Materials Science Forum (Volume 995)
• Pages: 84-88
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.995.84
• Online since: June 2020
• Authors: Lia Kouchahcvili*, Evgueniy Entchev
• Keywords: Cyclic Voltammetry, Electrolytes, Equivalent Series Resistance, Ethylene Glycol, Operating Potential, Supercapacitors

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DOI: 10.1007/s10008-014-2500-5