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Pressure evolution in propylene carbonate based electrochemical double layer capacitors
Authors:M. Hahn,R. Kö  tz,R. Gallay
Affiliation:a Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
b Maxwell Technologies SA, CH-1728 Rossens, Switzerland
c Honeywell Specialty Chemicals, D-12356 Seelze, Germany
Abstract: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 first time, measured the pressure increase in capacitor cells based on real EDLC electrode coils in 1 M (C2H5)4NBF4/propylene carbonate electrolyte during cycling between 0 and 2.5 V and for constant cell voltages up to 3 V. During cycling a reversible pressure decrease was observed upon charging. An irreversible pressure increase was monitored during load tests at constant cell voltages above 2.5 V. The absolute amount of gases evolved could be determined by means of simultaneous compressibility monitoring.
Keywords:Electrochemical double layer capacitor   Activated carbon   Propylene carbonate   Electrolyte decomposition   Pressure
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