The nonlinearities in the galvanostatic charging curves of supercapacitors provide insights into charging mechanisms

Supercapacitors are often charged using constant currents. The capacitance can be determined from the slope of voltage-time curve if measured voltage over supercapacitor increases linearly with time. However, resulting is nonlinear, which may lead one to interpret as being either time or dependent. In current work, systematic experimental studies nonlinearity galvanostatic charging curves a function applied and temperature undertaken for commercial supercapacitors in range 1–1000 F. A consistent theory developed explain available data. It demonstrated that attributed parallel resistance, latter inversely proportional current. influence faradaic charge transfer reactions surface reorganization on this resistance analyzed. proposed also used analyze data research literature, different types nonlinearities observed provide new insight into mechanisms occurring during various supercapacitors. • New method analyzing nonlinear Capacitance independent Parallel