Background: The separator is an important part of the battery

which prevents physical contact between electrodes during enable lithium ionic transportation. But most commercialized polyolefin porous membranes show low ion conductivity due to their inherent hydrophobic property and low porosity (45%). Purpose: The aim is to introduce polyacrylamide (PAAm) onto polypropylene (PP) separator

which could improve the affinity between nonaqueous electrolytes and electrodes. Methods: PP-g-PAAm separator was prepared by irradiation graft polymerization technique. The structure and the performance of pristine PP and PP-g-PAAm separator were analyzed by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) from the aspects of mechanical property

liquid electrolyte uptake and lithium-ion conductivity. The coin cell was assembled in the Ar-filled glove box and investigated. Results and Conclusion: The results indicate that the coin cell with the PP-g-PAAm separator performs better than that one with the pristine PP separator under the same condition. Abstract