Molecule of the Month
|Intercalation-Induced Dimensional Changes of EDLC Electrodes|
Electrochemical double layer capacitors (EDLC) are widely used and known for their high power density. Today’s EDLC devices work in the voltage range of 2.5 V without noticeable loss of power density after 100’000 charge/discharge cycles. One measure to increase power and energy density of EDLCs is t extend the voltage window. At elevated electrode potentials, however, other processes than pure double layer charging start to contribute to charge storage.
The image stems from the Ph.D. thesis of F. P. Campana and was carried out in collaboration between the Electrochemistry Laboratory of the Paul Scherrer Institute (PSI, R. Kötz) and the Electrochemistry group of our Department (Prof. Hans Siegenthaler).