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Improved low‐temperature performance of novel asymmetric supercapacitor with capacitor/battery‐capacitor construction

A concept for designing capacitor/battery‐capacitor asymmetric supercapacitor is proposed to improve low‐temperature capacitance, which consists of a capacitor‐type electrode (C) and a capacitor/battery‐type composite electrode (NiO/C). This construction overcomes the capacitor‐battery asymmetric supercapacitor's shortcoming of losing capacitance characteristics. By adjusting the NiO/C mass ratio to 1/2, the new NiO/C–C asymmetric supercapacitor maintains excellent capacitance feature (rectangular CV curves and symmetrical charge/discharge profiles) as well as enlarging the work potential to 1.5 V, showing improved low‐temperature capacitance in comparison with C‐C and NiO‐C constructions. It is believed to come from the decreased total inner resistance and charge‐transfer resistance due to the substitution of NiO electrode with NiO/C composite electrode in the asymmetric supercapacitor. Copyright © 2016 John Wiley & Sons, Ltd.