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Structure-Property Relationships

ENTEK manufactures lithium-ion separators using a “wet” process. The molecular weight distribution of polyethylene, the percentage and type of plasticizer, extraction and drying conditions, biaxial stretch ratios, and annealing temperature are all factors that impact the final structure and properties of the separator. ENTEK works with battery manufacturers to customize key separator characteristics such as thickness, air permeability, and % porosity. Figure 1 compares the morphology of an ENTEK separator to a “dry” process separator.

ENTEK wet process separator
SEM dry process
Figure 1. Scanning electron micrograph showing (A) ENTEK “wet” process separator compared to (B) competitor “dry” process separator.