Non-Aqueous Zn-Ion Hybrid Supercapacitors: Acetonitrile vs Propylene Carbonate Based Electrolyte

The development of high efficiency energy storage systems is increasingly important as these systems enable utilize energy from renewable sources and reduce greenhouse gas evolution caused by fuel combustion technologies at the same time. Electrochemical characteristics of Zn-ion hybrid supercapacitor (ZIHS) cells based on 1 M acetonitrile and propylene carbonate electrolytes in zinc tetrafluoroborate (Zn(BF4)(2)), zinc di[bis(trifluoromethylsulfonyl)imide] (Zn(TFSI)(2)) and zinc trifluoromethanesulfonate (Zn(OTf)(2)) have been studied using cyclic voltammetry, constant current charge/discharge and electrochemical impedance methods. The Ragone plots have been calculated from constant power measurement data. Very high energy and power densities (80 Wh kg(-1) and 21.2 kW kg(-1)) have been calculated for 1 M Zn(BF4)(2)/AN based Zn-ion hybrid supercapacitor. Some assembled ZIHSs had shown excellent cycling and energy stability over 20000 cycles.

Automated summary

The development of high efficiency energy storage systems is crucial for utilizing renewable energy and reducing greenhouse gas emissions caused by fuel combustion technologies. This study investigates the electrochemical characteristics of Zn-ion hybrid supercapacitor cells with different electrolytes, using cyclic voltammetry, constant current charge/discharge, and electrochemical impedance methods. The Ragone plots demonstrate high energy and power densities for the Zn-ion hybrid supercapacitor based on 1 M Zn(BF4)(2)/AN electrolyte (80 Wh kg(-1) and 21.2 kW kg(-1)). Some assembled ZIHSs exhibit excellent cycling and energy stability over 20000 cycles.