Thermomechanical analysis and durability of commercial micro-porous polymer Li-ion battery separators

▶ Thermomechanical analysis identifies mechanical transitions in polymers separators. ▶ The direction of mechanical loading is critical to the integrity of the separator. ▶ Anisotropic separators are mechanically limited in the transverse orientation. ▶ Biaxial separators have the same mechanical properties within the separator plane. ▶ Separators immersed in electrolyte show slight evidence of degradation.