Abstract
Numerous numbers of polyolefin-based microporous separators containing thermally stable inorganic/polymer composite layers have been developed to improve safety of lithium-ion batteries [1-3]. Because of hydrophobic surface property of polyolefin-based separators, the use of non-polar organic solvent, which is generally toxic and expensive, is prerequisite to introduce ceramic coating layers containing polymeric binders. Not only to price down the coating process but also to guarantee an environmentally friendly coating process, an aqueous ceramic coating process should be developed. Herein, we developed the complete water-based ceramic coating process to prepare inorganic/polymer composite coating layers on commercial polyethylene (PE) separators using plasma treatment. The plasma treatment introduced polar functional groups onto the surface of PE separators, thereby changed the surface properties of the PE separators from hydrophobic to hydrophilic. Consequently, the coating solution based on water uniformly covered the plasma treated PE separator surfaces without defects. We investigated the physical properties of ceramic-coated separators (CCSs), including their morphology changes, gurley number, thickness, and ionic conductivity. We also studied the electrochemical properties of cells containing the CCSs. CCS exhibits superior power capability and cycle performance compared to bare PE in unit cells based on lithium metal anodes. Acknowledges This research was supported by the Ministry of Trade, Industry & Energy (MOTIE), Korea Institute for Advancement of Technology (KIAT) through the Encouragement Program for The Industries of Economic Cooperation Region (G02A01280032701) Reference [1] Y. Lee, H. Lee, T. Lee, M.-H. Ryou, Y.M. Lee, J. Power Sources 294 (2015) 537-544. [2] D. Yeon, Y. Lee, M.-H. Ryou, Y.M. Lee, Electrochim. Acta 157 (2015) 282-289. [3] H. Jeon, D. Yeon, T. Lee, J. Park, M.-H. Ryou, Y.M. Lee, J. Power Sources 315 (2016) 161-168.
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