Voltage Dependence of Supercapacitor Capacitance

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Electronic Double-Layer Capacitors (EDLC), called Supercapacitors (SC), are electronic devices that are capable to store a relatively high amount of energy in a small volume comparing to other types of capacitors. They are composed of an activated carbon layer and electrolyte solution. The charge is stored on electrodes, forming the Helmholtz layer, and in electrolyte. The capacitance of supercapacitor is voltage- dependent. We propose an experimental method, based on monitoring of charging and discharging a supercapacitor, which enables to evaluate the charge in an SC structure as well as the Capacitance-Voltage (C-V) dependence. The measurement setup, method and experimental results of charging/discharging commercially available supercapacitors in various voltage and current conditions are presented. The total charge stored in an SC structure is proportional to the square of voltage at SC electrodes while the charge on electrodes increases linearly with the voltage on SC electrodes. The Helmholtz capacitance increases linearly with the voltage bias while a sublinear increase of total capacitance was found. The voltage on SC increases after the discharge of electrodes due to diffusion of charges from the electrolyte to the electrodes. We have found that the recovery voltage value is linearly proportional to the initial bias voltage value.

[1] Sedlakova, V., Sikula, J., Majzner, J., Sedlak, P., Kuparowitz, T., Buergler, B., Vasina, P. (2015). Supercapacitor equivalent electrical circuit model based on charges redistribution by diffusion. J. Power Sources, 286, 58-65.

[2] Sharma, P., Bhatti, T.S. (2010). A review on electrochemical double-layer capacitors. Energy Convers. Manag., 51, 2901-12.

[3] Zubieta, L., Bonert, R. (2000). Characterization of double-layer capacitors for power electronics applications. IEEE Trans. Ind. Appl., 36, 199-205.

[4] Belhachemi, F., Rael, S., Davat, B. (2000). A physical based model of power electric double-layer supercapacitors. Conference Record of the 2000 IEEE Industry Applications Conference, 5, 3069-76.

[5] Faranda, R. (2010). A new parameters identification procedure for simplified double layer capacitor twobranch model. Electr. Power Syst. Res., 80, 363-71.

[6] Torregrossa, D., Bahramipanah, M., Namor, E., Cherkaoui, R., Paolone, M. (2014). Improvement of Dynamic Modeling of Supercapacitor by Residual Charge Effect Estimation. IEEE Trans. Ind. Electron., 61, 1345-54.

[7] Graydon, J.W., Panjehshahi, M., Kirk, D.W. (2014). Charge redistribution and ionic mobility in the micropores of supercapacitors. J. Power Sources, 245, 822-9.

[8] Kaus, M., Kowal, J., Sauer, D.U. (2010). Modelling the effects of charge redistribution during self-discharge of supercapacitors. Electrochimica Acta, 55, 7516-23.

[9] Devillers, N., Jemei, S., Péra, M-C., Bienaimé, D., Gustin, F. (2014). Review of characterization methods for supercapacitor modelling. J. Power Sources, 246, 596-608.

[10] Kuparowitz, T., Sedláková, V., Szewczyk, A., Hasse, L., Smulko, J. (2014). Charge Redistribution and Restoring voltage of Supercapacitors. Electroscope, 2014, 1-7.

[11] Ike, I.S., Sigalas, I., Iyuke, S., Ozoemena, K.I. (2015) An overview of mathematical modeling of electrochemical supercapacitors/ultracapacitors. J. Power Sources, 273, 264-77.

Metrology and Measurement Systems

The Journal of Committee on Metrology and Scientific Instrumentation of Polish Academy of Sciences

Journal Information

IMPACT FACTOR 2016: 1.598

CiteScore 2016: 1.58

SCImago Journal Rank (SJR) 2016: 0.460
Source Normalized Impact per Paper (SNIP) 2016: 1.228


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