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Gas evolution and associated pressure build up in supercapacitor devices was monitored using commercial electrode rolls and 1mol/l solutions of TEABF 4 in acetonitrile (AN), propylene carbonate (PC), and γ-butyrolactone (GBL). During subsequent constant voltage periods (24h) at 2.5V, 2.75V, 3.0V and 3.25V, significant gas evolution was observed in GBL already at 2.5V. Under the same conditions,...
Increasing the available cell voltage for electrochemical double layer capacitors (EDLC) is one route to simultaneously increase energy density and power density of the EDLC. Increased cell voltage may, however, introduce faradaic reactions such as ion insertion and electrolyte decomposition, which potentially limit the lifetime of the device. Using a purpose designed pressure cell, we have, for the...
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