Dextrin-DADMAC-MBAA Hydrogel for High Ionic Conductible Flexible Aqueous Sodium Ion Hybrid Battery

For applications in energy storage devices, polymer electrolytes have attracted attention due to their favorable mechanical properties such as flexibility, strain stress, pressure and the ability to reduced reactivity with liquid electrolytes, suppression of dendrite growth. But the disadvantage that the ion conductivity is not as good as that of the liquid electrolyte is hindering the development of the polymer electrolytes. Here in, we demonstrate a high ion-conducting, flexible and double networked (DN) hydrogel films for Sodium Ion Hybrid Battery (SIHB). Hydrogel chain of DADAMC-Dextrin-MBAA is crosslinked by free-radical reaction of Dimethyldiallylammoniumchloride (DADMAC) and N, N′-methylene-bis-acrylamide (MBAA) and Dextrin chain. In addition, DADMAC and NaClO₄ salt undergo ion exchange reaction that prevents excessive expansion of DADMAC structure (which occurs due to the hydrophilicity of the gel), and also has the advantage of increasing physical properties such as strain stress and pressure. The DDM hydrogel is found to have an ionic conductivity of 31.2 mS cm⁻¹ at 25 °C, the tensile strength of 8000 KPa, electrochemically stable up to 2.5V.