Flexible Material O-PAM-LiCl Hydrogel Electrolyte for Advanced Supercapacitor

In this work, the O-PAM-LiCl hydrogel was prepared by free radical copolymerization of dimethyl sulfoxide and acrylamide, LiCl as filler, which exhibited highly recoverable stretchable property, excellent adhesive and self-healing capacity. O-PAM-LiCl hydrogel with good recovery tensile properties, good adhesion and self-healing ability (healing within 30 mins) was selected as the main research object. The results show that O-PAM-LiCl hydrogel electrolytes have excellent ionic conductivity of 1.8 S m ^-1 . The as-synthesized O-PAM-LiCl hydrogel electrolyte with CNTs-Ni electrodes shows a specific capacitance of 58.12 F g ^-1 at 50 mV s ^-1 in 3 g LiCl concentrations. After 2000 cycles, the capacitance retention is retained at 71.98% at a current density of 1 A g ^-1 . After assembling the supercapacitor using carbon nanotube electrode material, it exhibits excellent electrochemical performance upon evaluation. The introduction of LiCl resulted in the "salting in" effect, which partially destroyed the original hydrogen bonds in the hydrogels and endowed O-PAM-LiCl hydrogels with extremely high transparency and water retention properties. It was observed by SEM that the O-PAM-LiCl have loose porous structure. Furthermore, this composite hydrogel demonstrates significant potential for development.