Electrospun polyimide nanofiber-based nonwoven separators for lithium-ion batteries

► Polyimide (PI) nanofiber-based nonwovens have been fabricated via electrospinning for separators of LIBs. ► Electrospun PI nanofiber nonwovens show superior thermal stability than that of the commercial Celgard membrane. ► Compared to the Celgard membrane, PI nanofiber nonwovens exhibit better wettability toward electrolyte. ► The electrospun PI nanofiber nonwoven separators present high-performance battery properties.