Electrospun PU/PVP/GO Separator for Li-ion Batteries

Polyurethane (PU) has been intensively studied as a promising separator material for Li-ion batteries (LIBs). However, poor dimensional stability and low liquid-electrolyte wettability of pure PU separator restrict its application in LIBs. Here polyvinyl pyrrolidone (PVP) and graphene oxide were employed to enhance the thermal stability, mechanical performance and liquid-electrolyte compatibility of PU separator. High anodic stability above 5.25 V was reached in PU/PVP/GO separator, fully compatible with the high-voltage cathode materials. The electrochemical characterization indicates PU/PVP/GO membrane is a promising separator for advanced LIBs.