Structural and Electrical Properties of NaCl‐Modified Xanthan Gum Biopolymer Electrolytes for Energy Storage Applications

ABSTRACT Biopolymer electrolytes have emerged as promising materials for energy storage and electrochemical applications due to their eco‐friendliness, flexibility, and ionic conductivity. This study investigates xanthan gum (XG) complexed with sodium chloride (NaCl) as a sustainable, flexible solid biopolymer electrolyte (SBEs) for energy storage applications. SBE films were fabricated via solution casting and characterized using X‐ray diffraction (XRD), impedance spectroscopy, and dielectric analysis. XRD confirmed the amorphous nature of the XG: NaCl system, promoting ion transport. Impedance spectroscopy revealed a significant decrease in bulk resistance with NaCl doping, leading to enhanced ionic conductivity, reaching a maximum of 8.83 × 10 −6 S/cm at 30°C for 80XG: 20NaCl system. Dielectric analysis revealed significantly low‐frequency polarization, indicating excellent charge storage capabilities. These findings demonstrate that XG: NaCl SBEs are a highly promising, cost‐efficient solution for next‐generation electrochemical energy storage devices.