In-situ monitoring of EDLCs operation by physico-chemical techniques
TP-AAB-AABC_2009_21
06/10/2009
- Content
- A fundamental understanding of the processes occurring during electrochemical double layer capacitor (EDLC) operation is a prerequisite for estimating the performance limits of these devices and for the suggestion of measures for improvement. Most of today’s commercially available EDLCs are based on activated carbon (AC) electrodes and utilize an organic electrolyte. These devices typically show specific energies around 5 Wh/kg, which for some applications is not sufficient. In order to increase the energy of an EDLC there are two options; (i) increase the capacitance of activated carbons by utilizing so called advanced carbons or (ii) increase the nominal voltage of the capacitor by driving the electrodes to higher/lower potentials. While the former approach would only promote the energy of the device, the latter will also increase the power. In this presentation the two approaches will be discussed, explicitly limited to so-called double layer capacitors excluding pseudo capacitance and redox materials like oxides or polymers.
- Citation
- Kötz, R., Ruch, P., and Cericola, D., "In-situ monitoring of EDLCs operation by physico-chemical techniques," SAE Technical Paper TP-AAB-AABC_2009_21, 2009, .