[15p-P3-1~32] 6.3 Oxide electronics

[15p-P3-18] Origin of interface resistance at solid-electrolyte and electrode interface

〇Susumu Shiraki¹, Tetsuroh Shirasawa², Toru Suzuki¹, Hideyuki Kawasoko¹, Ryota Shimizu³, Taro Hitosugi^1,3 (1.AIMR, Tohoku Univ., 2.AIST, 3.Tokyo Tech)

Keywords:lithium batteries, thin films, pulsed laser deposition

We examined the electrolyte/electrode interface atomic structures with high and low electrolyte/electrode interface resistance in all-solid-state thin-film batteries, using synchrotron surface x-ray diffraction. The thin-film batteries exhibited very low electrolyte/electrode interface resistance of 12.4 Ohm cm₂, which is smaller than that in lithium-ion batteries using liquid electrolyte. Synchrotron surface x-ray diffraction analysis revealed that the low resistive electrolyte/electrode interface shows flat and well-ordered atomic arrangements at the electrode surface. In contrast, the high resistance interface shows disordered interface. These results indicate that lateral migration of lithium ion is a critical factor to reduce interface resistance.