Presentation Information
[18a-PA3-29]Electrochemical performance of lithium-ion battery separators with a MAO base protective layer
〇Daiki Uto1, Kenji Yoshino1,2 (1.Univ. of Miyazaki, 2.GX Research Lab.)
Keywords:
lithium ion battery,separator,Methylaluminoxane (MAO)
To improve the safety of lithium-ion batteries, an Al2O3 protective layer was formed on polyethylene (PE) separators by spray coating using a novel methylaluminoxane (MAO)/NMP precursor solution. The MAO-coated separators exhibited suppressed thermal shrinkage after annealing, indicating enhanced thermal stability. Charge–discharge tests of lithium-ion batteries using the coated separators were conducted under elevated temperature conditions up to 4.5 V. The charge–discharge curves showed typical behavior without significant polarization or abnormal voltage changes due to the MAO coating. In addition, the Coulombic efficiency of the MAO-coated PE separator was higher than that of the uncoated PE separator. These results suggest that spray coating with MAO is a promising and scalable approach for improving the thermal stability of separators while maintaining reversible electrochemical performance under high-voltage operating conditions.