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Supporting Information_All-Solid-State Battery_20230303 .pdf (652.03 kB)

TiO2 Anode Material for All-Solid-State Battery Using NASICON Li1.5Al0.5Ge1.5(PO4)3 as Lithium Ion Conductor (Supporting Information)

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posted on 2023-05-31, 01:56 authored by Yoichiro KAWANO, Akihiko KATO, Hiroyuki USUI, Yasuhiro DOMI, Hiroki SAKAGUCHI

We have been developing sintered multilayer oxide-based all-solid-state batteries. Anode active material rutile-type TiO2 was not reacted with amorphous Na superionic conductor (NASICON)-type solid electrolyte Li1.5Al0.5Ge1.5(PO4)3 (LAGP) even after sintered at 600 °C in a nitrogen atmosphere from the XRD patterns. The charge/discharge behavior of the electrochemical measuring cell (when using a non-aqueous electrolyte) was not different from that of rutile-type TiO2. However, anatase-type TiO2 charge/discharge behavior changed after sintering process. Additionally, in the result of the input/output characteristics using multilayer oxide-based all-solid-state battery, rutile-type TiO2 as anode material was 3 times higher discharge capacity than anatase-type TiO2 at current value 25.6 µA mm−2. Finally, we successfully measured the Raman spectroscopy of all-solid-battery and rutile-type TiO2 Raman shift peaks were reversibility during charge/discharge. Based on these findings, we conclude that rutile-type TiO2 maintained a strong crystalline structure and high Li diffusivity even when sintered with amorphous LAGP. It suggested that rutile-type TiO2 is suitable as anode material for oxide-based all-solid-state batteries requiring the sintering process.

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Corresponding author email address

sakaguch@tottori-u.ac.jp

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© 2023 The Author(s).

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