Effect of particle size of activated carbon on rate performance of electric double layer capacitors
ICMREE), 2011 International Conference（2011）
Abstract
High surface area activated carbon (AC) obtained by KOH activation was pulverized by ultrasonic air-jet pulverization equipment and the effect of particle size of AC on rate performance of electric double layer capacitors (ECs) was investigated by electrochemical impedance spectrometry using an equivalent circuit model based on a mixed kinetic and charge transfer control. The model parameters were extracted by Marquardt fitting method. The series solution resistance, polarization resistance and Warburg resistance were obtained. It is found that both the series solution resistance and polarization resistance are independent of the particle size while the Warburg resistance determined by the mass transport resistance or diffusion coefficient of ions within pores of AC particles governs the rate capability of the AC based ECs, owing to the short diffusion length of ions within pores of AC particles.
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Key words
marquardt fitting method,equivalent circuit model,activated carbons,electric double layer capacitors,supercapacitors,alternate current impedance spectrometry,series solution resistance,electrochemical impedance spectroscopy,charge exchange,rate performance,charge transfer control,diffusion coefficient,electrochemical impedance spectrometry,high surface area activated carbon,particle size,ultrasonic air-jet pulverization equipment,activated carbon,mixed kinetic transfer control,warburg resistance,mass transport resistance,polarization resistance,equivalent circuit,impedance,electric double layer,integrated circuit,equivalent circuits
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