Synthesis and characterization of NASICON-type Ceramic LATP/Polymer flexible composite solid electrolytes

The increasing demand for electric vehicles and flexible electronic devices has driven extensive research into next-generation batteries with enhanced safety, higher energy density, and longer cycle life. Solid-state lithium batteries, which offer improved safety over traditional liquid electrolyte systems, are at the forefront of these advancements. This thesis focuses on the development of highly conductive and flexible solid electrolytes for use in rechargeable solid-state lithium batteries. NASICON-type lithium aluminum titanium phosphate (LATP) and boron doped LATP ceramic solid electrolytes were synthesized using the solid-state reaction method. The crystal structure, surface morphology, and ionic conductivity of LATP and boron doped LATP electrolytes were systematically investigated. The highest ionic conductivity obtained was 1.3×10⁻3 S.cm-1 at room temperature, comparable to liquid electrolytes, making it a promising candidate for all-solid-state battery applications. Additionally, to enhance flexibility and performance, the LATP ceramic electrolyte was combined with lithium trifluoromethanesulfonate (LiTf), Lithium Perchlorate (LiClO₄), and Lithium Bis(trifluoromethanesulfonyl)imide (LiTFSI). The composite solution casting method was used to prepare the material, and succinonitrile (SN) was added as a plasticizer to further improve ionic conductivity. This composite electrolyte system offers a suitable solution for high-performance, flexible, and safe solid-state lithium-ion batteries.