Gel Polymer Electrolytes Based on Polyvinyl Alcohol for Zinc-Ion Hybrid Supercapacitors
Zinc ion hybrid capacitors(ZIHCs)are a competitive alternative for the next generation of energy storage devices.They combine the high energy density of batteries and high power density of capacitors.However,the ZIHCs with battery-type cathode and capacitor-type anode mostly use electrolyte solutions,which are prone to leakage and lead to safety risks.To address this issue,this paper presented a strategy for gel polymer electrolytes(GPE)with honeycomb-like three-dimensional network morphology,which was prepared from cellulose,hydroxyethylcellulose and polyvinyl alcohol via freeze-thawing and following electrolyte absorption method.The optimized GPE not only exhibits good mechanical properties(tensile strength of 0.24 MPa,elongation at break of 289％),but also shows a high ionic conductivity(58.5 mS/cm).A ZIHC composed of GPE,manganese dioxide cathode,and activated carbon cathode achieves a specific capacitance of 31.5 F/g and an energy density of 15.0 Wh/kg.Furthermore,it maintains a specific capacitance of～80％even after 1.5×104 charge/discharge cycles at 2 A/g,demonstrating promising potential application of GPE in the field of ZIHC.The usage of environmentally friendly raw materials and facile preparation method also provide a new insight for GPE investigation in applications of energy storage and flexible wearable electronics.
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