Electrospun Polyimide Nanofiber Separators for Lithium-ion Batteries

The electrospun polyimide (PI) nanofiber membrane was prepared and used as lithium-ion battery separator. The electrochemical properties of the PI membrane were test. The experimental results showed that the ionic conductivity of the PI membrane was 1.310e-3 S/cm. The electrochemical stability window is 5.5 V. The PI membrane had a specific discharge capacity of 110.5 mAh/g and an efficiency of 97.3% after 111 charging and discharging cycles. The physical properties such as surface morphology, thermal stability, and contact angle of PI film was also measured. Our results show that the electrospun nanofiber membrane has potential application in lithium-ion battery separators.