New design of electric double layer capacitors with aqueous LiOH electrolyte as alternative to capacitor with KOH solution |
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Authors: | Izabela Stepniak Aleksander Ciszewski |
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Affiliation: | Poznan University of Technology, Institute of Chemistry and Technical Electrochemistry, ul. Piotrowo 3, 60-965 Poznan, Poland |
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Abstract: | Activated carbon (AC) fiber cloths and a hydrophobic microporous polypropylene (PP) membrane, both modified with lithiated acetone oligomers, were used as electrodes and a separator in electric double layer capacitors (EDLCs) with aqueous lithium hydroxide (LiOH) as the electrolyte. Electrochemical characteristics of EDLCs were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge cycle tests and impedance spectroscopy (EIS), compared with a case of the capacitor with aqueous potassium hydroxide (KOH) as an electrolyte. As a result, the capacitor with LiOH aqueous solution and a modified separator and electrodes was found to exhibit higher specific capacitance, maximum energy stored and maximum power than that with KOH aqueous solution. |
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Keywords: | Electrochemical capacitor Lithium hydroxide electrolyte Potassium hydroxide electrolyte Modified separator |
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