Polymer based separators emerge as a promising alternative to conventional fluid separators in battery systems due to their inherent flexibility, mechanical durability and potential for structural customization. Although polymers typically exhibit poor electrical conductivity, their functionality can be improved by incorporating ionic liquid (IL) and lithium-ion salts. This enhancement not only improves ionic transport but also broadens the scope for developing next generation energy storage materials. Polymethylmethacrylate (PMMA) stands out due to its excellent chemical resistance, thermal stability and processability for application as separators. The study aims to fabricate PMMA based naonofibers incorporated with ionic liquids (ILs) and Li ion salt for battery separators. Polymethylmethacrylate (PMMA) is first dissolved in N, N Dimethylformamide (DMF) and combine with ionic liquid 1-Butyl -3-methyl imidazolium bis (trifluoromethyl sulfonyl) imide (BMIM TFSI) and different concentration of Lithium bis (trifluoromethyl sulfonyl) imide (LiTFSL), a lithium ion conducting salt. The composite solution is processed electrospinning using the Fluidnatek LE – 50 system to produce uniform nanofibrous mats. The nanofibers are characterization using Scanning Electron Microscopy (SEM) for morphological analysis and Flash Differential Scanning Calorimetry (FDSC 2+ from Mettler Toledo) for thermal analysis. SEM result shows that the fibers are uniform, continuous and well aligned, indicating stable electrospinning conditions and excellent mechanical integrity of the composite material. FDSC results demonstrate that the incorporation of ILs acts as a plasticizer, enhancing polymer chain mobility and decrease in the glass transition temperature (Tg). The findings highlight the potential of PMMA-IL-LiTFSI composite nanofibers as high-performance gel polymer electrolyte for lithium-ion battery separators. The result contributes to valuable insight into the design, fabrication, and thermal behavior of IL based polymer nanofibers, offering a pathway towards safer, more flexible and efficient energy storage systems.
