Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 20, Pages 6881-6886Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.06.039
Keywords
Supercapacitor; Polymer gel electrolyte; KI additive; Pseudocapacitance; Electrical double-layer capacitance
Categories
Funding
- National High Technology Research and Development Program of China [2009AA03Z217]
- National Natural Science Foundation of China [90922028, 50842027]
- Chinese Ministry of Education [211204]
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A quasi-solid-state supercapacitor was assembled by using alkaline polyvinyl alcohol and potassium iodide (PVA-KOH-KI) as gel electrolyte and activated carbons electrodes. The electrocapacitive properties of the supercapacitor were evaluated by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. The introduction of KI increases the ionic conductivity of electrolyte, and improves the pseudocapacitance of the electrode. The specific capacitances of the supercapacitor is 236.90 F g(-1), increasing by 74.28% compared to the PVA-KOH system at the same current density. The energy density and power density of the supercapacitor reach 7.80 Wh kg(-1) and 15.34 kW kg(-1), respectively. In addition, the supercapacitor exhibits excellent cycle-life stability. (C) 2011 Elsevier Ltd. All rights reserved.
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