Effect of Al2O3 Coatings Prepared By RF Sputtering on Polyethylene Separators for High Power Lithium-Ion Batteries
In order to develop a novel and economical process with continuous processing, in this study, we introduced Radio Frequency (RF) sputtering method for fabricating aluminum oxide (Al2O3) ceramic coating layers onto PE separators. Coating thickness of Al2O3 layers was controlled as a function of RF sputtering power and coating time. We also evaluated morphological changes of PE separators in regard to sputtering time by measuring Gurley number, wettability, and ionic conductivity. The unit cells employing coated PE separators revealed similar level of cell performance compared to those of the unit cells employing bare PE separators. We believe that the improved wetting ability of ceramic coating layers successfully compensates pore-blocking effect. On the other hand, we verified that heat resistance of Al2O3 coated PE separators was remarkably improved out of a short sputtering time.
 H. Jeong, S. Hong,and S. Lee, Journal of Membrane Science 364 (2010) 177-182
 Y. Lee, M. Ryou, M. Seo, J. Choi, and Y. Lee, Elec. Acta, 113 (2013) 433-438
 J. Song, M. Ryou, B. son, J. Lee, D. Lee, Y. Lee, J. Choi, and J. Park, Elec. Acta, 85 (2012) 524-530