<![CDATA[This study developed a polyvinylidene fluoride (PVDF)-based lithium-ion battery separator reinforced with chitosan to improve performance and thermal stability. The primary objective of this study was to produce a chitosan-modified PVDF-based separator to enhance performance, thermal stability, and resistance to shrinkage. The fabrication methods used included spin coating with varying PVDF:chitosan ratios of 0.6:0.4, 0.7:0.3, 0.8:0.2, 0.9:0.1, and 1:0, as well as spin coating times of 10, 15, 20, 25, and 30 seconds. In the spin coating method, the solution was applied to ITO glass that had been cleaned using an ultrasonic cleaner, then spun for 10, 15, 20, 25, and 30 seconds, soaked in distilled water for 48 hours, and dried in a vacuum oven at 60°C for 6 hours. The results showed that a ratio of 0.7:0.3 produced an optimal thickness of 20 µm, in accordance with battery separator standards (25 µm). Thermal shrinkage testing at the same ratio yielded a shrinkage of 3.5%, in accordance with separator standards (5%). In the electrolyte wettability test, the electrolyte absorption rate was 268.5% (Excellent), and the electrolyte retention rate was 72.9% (Excellent). The porosity test yielded a porosity of 39.8%. Keywords: Lithium-ion battery, Polyvinylidene Fluoride, Chitosan, Separator, Spin Coating]]>
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