Study of Optical, Thermal, Electrical, and Impedance Properties of Li4Ti5O12-Based PEO/SA Biopolymer Blend Electrolytes for Lithium-Ion Batteries
DOI:
https://doi.org/10.1149/2162-8777/adb78eAbstract
Nanocomposites composed of polyethylene oxide (PEO) and sodium alginate (SA), containing varying contents of lithium titanium oxide nanoparticles (Li4Ti5O12NPs), were synthesized by solution casting technique. Li4Ti5O12 was incorporated into PEO/SA blend and is a valuable biopolymer for its biocompatibility, solubility and eco-friendliness. Structural analysis via X-ray diffraction spectroscopy revealed a decrease in the crystallinity of PEO/SA matrix with increasing nanoparticle content. Complementary Fourier transform infrared analysis verified the presence of strong molecular interactions between Li4Ti5O12 and the blend chains. Scanning electron microscopy verified a uniform dispersion of Li4Ti5O12 within PEO/SA blend, contributing to the improved properties of the electrolytes, while optical analysis showed a decrease in the bandgap energy, indicating enhanced light absorption and improved suitability for applications in nanodielectric devices. The thermal stability of PEO/SA/Li4Ti5O12 electrolyte samples was improved as shown by thermogravimetric analysis. Furthermore, a significant improvement in the ionic conductivity of the filled samples was observed, attributed to the reduced bulk resistance and improved charge transport pathways. Dielectric studies further showed improved dielectric permittivity and reduced dielectric losses for filled samples, enhancing the material’s charge storage capability. These findings highlight the potential of PEO/SA/Li4Ti5O12 biopolymer electrolytes for advanced applications in nanodielectric devices and lithium-ions batteries.
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