The membrane between a battery’s anode and cathode is referred to as the separator. These films must be capable of withstanding harsh conditions all the way from manufacturing processes to extreme climates.
Separator Film Testing
A critical part of Li-ion or other liquid electrolyte batteries, separators are films most commonly made of polymers and must be mechanically strong enough to withstand the winding operation during the battery’s assembly. The critical mechanical properties suppliers must control are tensile strength, elongation, and puncture resistance.
ASTM D882 outlines the tensile testing of thin plastic film, which is suitable for polymer separators. Instron offers a variety of testing solutions that comply with D882. The different tiers of product offerings provide superior accuracy and throughput for labs that require it and more affordable solutions for labs that do not. Please review Instron’s ASTM D882 Definitive Guide for additional details. Relating to puncture tests, ASTM F1306 outlines the puncture testing of flexible barrier films to characterize the material response when a 3.2 mm diameter probe is driven into a clamped specimen. Instron’s S1-14110 fixture is in compliance with the recommended fixture specifications described in F1306.