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Performance of Electric Double Layer Capacitors with Polymer Gel Electrolytes

Published online by Cambridge University Press:  10 February 2011

Masashi Ishikawa ,
Takahiro Kishino ,
Naoji Katada  and
Masayuki Morita
Masashi Ishikawa
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi University, 2–16–1, Tokiwadai, Ube 755–8611, Japan, [email protected]
Takahiro Kishino
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi University, 2–16–1, Tokiwadai, Ube 755–8611, Japan, [email protected]
Naoji Katada
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi University, 2–16–1, Tokiwadai, Ube 755–8611, Japan, [email protected]
Masayuki Morita
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi University, 2–16–1, Tokiwadai, Ube 755–8611, Japan, [email protected]
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Abstract

Polymer gel electrolytes consisting of poly(vinylidene fluoride) (PVdF), tetraethylammoniumtetrafluoroborate (TEABF4), and propylene carbonate (PC) as a plasticizer have been investigatedfor electric double layer capacitors. The PVdF gel electrolytes showed high ionic conductivity (ca.6 mS cm-1 at 298 K). To assemble model capacitors with the PVdF gel electrolytes and activatedcarbon fiber cloth electrodes, a pair of the fixed electrodes was soaked in a precursor solutioncontaining PC, PVdF, and TEABF4 , followed by evaporation of the PC solvent in a vacuumoven. The resulting gel electrolytes were in good contact with the electrodes. The modelcapacitors with the PVdF gel electrolytes showed a large value of capacitance and high coulombicefficiency in operation voltage ranges of 1–2 and 1–3 V. It is worth noting that the capacitors withthe PVdF electrolytes showed long voltage retention in a self-discharge test. These goodcharacteristics of our gel capacitors were comparable to those of typical double layer capacitorswith a liquid organic electrolyte containing PC and TEABF4; rather, the voltage retentivity of thePVdF gel capacitors was much superior to that of the capacitors with the organic electrolyte.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 575: Symposium CC – New Materials for Batteries & Fuel Cells , 1999 , 423
Copyright
Copyright © Materials Research Society 2000

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References

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