Lithium-ion battery separators act as components that have a function of thermal shutdown at a specific temperature for safety issues. Exposing these separators at high temperatures, lower than the shutdown temperature, can affect the performance, structure, and properties of these batteries. In this research, the effect of thermal shrinkage on the structural characterization, thermal and mechanical properties, and ionic conductivity of a polypropylene (PP) lithiumion battery separator was studied. The obtained results showed that the PP

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