[17p-W9_324-1~16] 21.1 Joint Session K "Wide bandgap oxide semiconductor materials and devices"

5:30 PM - 5:45 PM JST(8:30 AM - 8:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[17p-W9_324-16] Development of a protective layer for lithium-ion battery separators using a novel Li-doped MAO material

〇Daiki Uto¹, Shintaro Yasui², Akira Nagaoka^1,3, Kenji Yoshino^1,3 (1.Univ. of Miyazaki, 2.Inst. of Sci. Tokyo, 3.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 methylaluminoxane (MAO)/NMP precursor solution. The thermal stability and ionic transport properties of the coated separators were investigated. MAO-coated PE separators exhibited suppressed thermal shrinkage after annealing, indicating enhanced thermal stability. However, electrochemical impedance spectroscopy revealed an increase in separator resistance due to the MAO coating. To reduce this resistance, Li doping was introduced by adding a Li component into the precursor solution. As a result, the resistance of Li-doped MAO/PE separators was significantly reduced and became comparable to that of bare PE separators. These results suggest that spray-derived MAO-based protective layers combined with Li doping are a promising approach for achieving improved thermal stability while maintaining ionic transport properties through a simple and scalable coating process.