[16p-W9_327-1~16] 16.1 Fundamental properties, evaluation, process and devices in disordered materials

3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)

[16p-W9_327-9] Lithium-Ion Incorporation and Diffusion in Mist-CVD–Grown Amorphous Titanium Oxide Films on Graphite Substrates for LIB Anode Applications

〇Hajime Shirai^1,2, Fumiya Kobayashi², Hideki Kurihara³, Yoshiaki Yamamoto⁴, Haiyan He⁴, Hirotaka Sone¹, Tomomasa Sato², Nobuyuki Matsuki², Toshinori Oono⁴ (1.Saitama Univ., 2.Kanagawa Univ., 3.SAITEC, 4.Amaya Co., Ltd)

Keywords:

Lithium ion battery,Amorphous titanium oxide,Diffusion mechanism of lithium ions

Electrochemical and concentration-driven Li⁺ diffusion experiments were conducted to clarify the role of amorphous TiO_x films deposited by mist CVD on graphite. In electrochemical lithiation, electron injection accompanies Li⁺ insertion, generating Ti³⁺ and reconstructing the Ti-O network for dynamic, redox-coupled diffusion.In contrast, LiPF₆ mist exposure induces passive, Ti⁴⁺-dominated diffusion with pseudo-Drude absorption arising from field-induced polarization rather than chemical reduction. The graded dielectric contrast across the Cu/graphite/a-TiO_x/LiPF₆ interfaces rectifies Li+ flux and stabilizes charge transfer, demonstrating that a-TiO_x serves as an electrostatic flux-rectifying and redox-buffering layer on graphite for uniform Li⁺ transport.