Unequalisation of electrode capacitances for enhanced energy capacity in asymmetrical supercapacitors

An increase beyond 70% in specific energy of an asymmetrical supercapacitor of carbon (−) and composite of carbon nanotubes and polyaniline (+) was achieved by firstly identifying the ‘cell voltage limiting electrode’, and then adjusting the capacitance ratio of the ±electrodes from 1.0 to 1.3.