Preparation and Performance of a PU/PAN Lithium-Ion Battery Separator Based on a Centrifugal Spinning Method

The diaphragm is a key component of the lithium-ion battery and largely determines its performance. Currently, commercial diaphragms suffer from poor thermal stability, low porosity, liquid absorption rate. In this study, we prepared polyurethane/polyacrylonitrile (PU/PAN) using centrifugal spinning method with PU as main substrate PAN additive. results showed that PU/PAN nanofiber by had 3D porous structure, when 18% PU:PAN = 7:3, porosity fiber was 83.9%, rate 493%, ionic conductivity 1.79 mS/cm. system good electrochemical performance an stability window 5.2 V. did not shrink heated at 160 °C. lithium iron phosphate (LiFePO4) cathode material, capacity remained 147.1 mAh/g after 50 cycles 0.2 C rate, retention 95.8%. This indicated excellent cycle multiplicative application potential.