Konjac Glucomannan Derived Biodegradable Superionic Solid-State Electrolyte Films for Devising Economically Viable Supercapacitor

Abstract

We synthesized biodegradable and economically viable solid-state electrolyte films based on konjac glucomannan (KG) and sodium iodide (NaI). Among the KG_NaI-x (x = 31-69 wt%) films, KG_NaI-69 exhibits superior flexibility, biodegradability, and sodium superionic conductivity of 77.9 mS cm⁻¹. The KG_NaI-69-based supercapacitor delivers outstanding electrochemical efficiency and cycling stability, retaining 84.4% capacitance after 5000 cycles establishing its potentiality toward flexible energy storage devices.