Internal short circuits caused by foreign particles or lithium dendrites are an inherent danger for lithium ion cells. They can result in cell damage, increased self-discharge, capacity loss, or even thermal runaway (worst case scenario).
Freudenberg Safety Separators minimize these effects: the separators are susceptible neither to local heat caused by internal shorts nor to large-scale warming from external sources, as they do not shrink below temperatures of 250°C. Freudenberg separators cannot be penetrated by loose electrode particles or contaminates. As a result, most causes of internal short circuits can be prevented.