Journal
ACS APPLIED ENERGY MATERIALS
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c02623
Keywords
cotton fibers; Al3+additive; neutral gel polymer electrolyte; high voltage; aqueous supercapacitor
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This study presents a crosslinking cotton fiber-/PVA-based membrane (CPM) with high porosity and liquid electrolyte uptake. By incorporating Al3+ into Li2SO4 electrolyte, the electrochemical stability is improved and the specific capacitance of the supercapacitor is enhanced. The findings offer a potential way to design high-output-voltage aqueous supercapacitors through electrolytes and membrane strategies.
Electrolyte additives have been widely studied in the improvement of stability of aqueous electrolytes. Here, we report a crosslinking cotton fiber-/ PVA-based membrane (CPM) with an excellent porosity of 73.82% and an ultrahigh liquid electrolyte uptake of 900 wt %, prepared by the solution casting method. Li2SO4 as an electrolyte salt and various concentrations of Al3+ as additives were used for fabricating the gel polymer electrolyte (GPE). On adding Al3+ into the Li2SO4 electrolyte, dissociative water and bound water in Li+ solvation interact with Al3+; this affects water molecule activity and reduces Li+ solvation. While the presence of Al3+ electrolyte exhibits better electrochemical stability under a high operating voltage of 1.6 V, the highest specific capacitance of a supercapacitor (SC) is 136 F g-1 at 1.0 A g-1, and it has 91% initial capacitance retention after 20 000 charge-discharge cycles, which is higher than that of the Li2SO4 electrolyte. This work provides a path for designing a high-output-voltage aqueous supercapacitor via electrolytes and the membrane strategy.
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