Anji Reddy Polu, Aseel A. Kareem, Markus Diantoro
In this work, tamarind seed polysaccharide (TSP)-based solid biopolymer electrolytes (SBEs) incorporated with sodium tetrafluoroborate (NaBF4) are investigated for their suitability in sodium-ion battery (SIB) technologies. The SBEs were prepared using a solution casting method. The ionic conductivity of the TSP-NaBF4 electrolytes was analyzed as a function of salt concentration and temperature via impedance spectroscopy. Results indicated an optimal composition of 70TSP-30NaBF4, achieving a maximum conductivity of 2.68 × 10−⁴ S/cm at room temperature (30°C), and exhibiting Arrhenius-type thermally activated behavior. The ionic transference number (tion) was determined using the Wagner polarization method. Linear sweep voltammetry was employed to assess the electrochemical stability window, ensuring compatibility with SIB operation. The optimized electrolyte's practicality was further evaluated through primary SIB discharge studies, demonstrating stable electrochemical performance and reasonable discharge capacity. The study concludes that TSP-NaBF4 SBEs offer a promising, eco-friendly alternative for sustainable energy storage applications. © 2025 Wiley-VCH GmbH.
Materials For Energy Devices Lab, Department of Physics, BVRIT HYDERABAD College of Engineering for Women, Telangana, Hyderabad, India; Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq; Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Malang, Malang, Indonesia
