, Volume 8, Issue 1, pp 15-16
Date: 05 Aug 2003

Composite supercapacitor electrodes

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In order to minimize the binder content of the supercapacitor electrodes we tried a novel concept of electrode preparation: We performed carbon precipitation on a current collector substrate by a method which has been developed in our laboratory: substrate induced coagulation (SIC) [1]. Basically, the thickness of the carbon coatings which can be prepared in one 4-step dipping cycle (1 coagulation inducer, 2 rinse, 3 carbon dispersion, 4 rinse) is in the order of a few hundred nm. The required contact time in the carbon dispersion is about 2 min, prolonged contact time does not increase the amount of deposited carbon significantly. By additional dipping cycles more carbon can be deposited. Finally, practically binder-free carbon black based supercapacitor electrodes are achieved [2]. The specific capacitance of the electrodes made by the SIC process was not as high as expected (C=23 F g−1). Consequently an activation step was introduced to improve the electrode porosity: Oxidation of c ...

Presented at the 3rd International Meeting "Advanced Batteries and Accumulators", June 16th–20th 2002, Brno, Czech Republic