Electrochemical impedance spectroscopy for different types of supercapacitors
| Autor: | Cristian Pirvu, Cristina Marghescu, Paul Svasta, Al. Vasile, Rodica Negroiu |
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| Rok vydání: | 2017 |
| Předmět: |
Supercapacitor
Materials science Equivalent series resistance business.industry Capacitive sensing Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance 0104 chemical sciences law.invention Dielectric spectroscopy Capacitor law Optoelectronics 0210 nano-technology business Low voltage Voltage |
| Zdroj: | 2017 40th International Spring Seminar on Electronics Technology (ISSE). |
| Popis: | Electric Double Layer Capacitors (EDLCs) are relatively new electronic components developed in the late 1980s; their operation is based on a Helmholtz double layer of charge formed on an activated carbon surface (of high equivalent surface) and an electrolyte. The advantages of this constructive solution are a very small capacitive distance and large effective capacitive area, leading to remarkably large capacitances. EDLCs tend to be low voltage, low impedance devices, sustaining high currents, and with a capacitance dependent on the charge-up voltage. In this context it is important to accurately know their parameters in order to design the associated circuitry — in particular of interest are values for equivalent series resistance (ESR) and parallel resistance (self-discharge) of the EDLC. The results presented in this paper are focused on a comparison between using the electrochemical impedance spectroscopy (EIS) method and the direct method (DM) in determining super capacitor parameters. This comparison was performed in the 10−… 105 Hz range, albeit (due to parasitic components) only the 10−…103 Hz range is effective. |
| Databáze: | OpenAIRE |
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