Electrode compositions for carbon power supercapacitors

The purpose of this work was to prepare economically-large electrodes in order to assemble mono-element supercapacitors with a capacity of more than 300 F and to reach powers in the range of 125 W (2 V/element) with the selected structure. In this paper, results are presented from different binder compositions—PTFE and a mixture of CMC/PTFE—that were tested in order to increase the volumetric capacitance of the electrode. The electrode composition was adapted to each binder composition used. For cost reasons, the amount of PTFE was reduced and the mixture of CMC/PTFE was examined as a cheaper alternative. We have obtained more than 25 F cm−3 per electrode, with a time constant close to 3 s, and power outputs compatible with automotive applications.