TiO<sub>2</sub> Anode Material for All-Solid-State Battery Using NASICON Li<sub>1.5</sub>Al<sub>0.5</sub>Ge<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> 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<p>We have been developing sintered multilayer oxide-based all-solid-state batteries. Anode active material rutile-type TiO<sub>2</sub> was not reacted with amorphous Na superionic conductor (NASICON)-type solid electrolyte Li<sub>1.5</sub>Al<sub>0.5</sub>Ge<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> (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 TiO<sub>2</sub>. However, anatase-type TiO<sub>2</sub> 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 TiO<sub>2</sub> as anode material was 3 times higher discharge capacity than anatase-type TiO<sub>2</sub> at current value 25.6 µA mm<sup>−2</sup>. Finally, we successfully measured the Raman spectroscopy of all-solid-battery and rutile-type TiO<sub>2</sub> Raman shift peaks were reversibility during charge/discharge. Based on these findings, we conclude that rutile-type TiO<sub>2</sub> maintained a strong crystalline structure and high Li diffusivity even when sintered with amorphous LAGP. It suggested that rutile-type TiO<sub>2</sub> is suitable as anode material for oxide-based all-solid-state batteries requiring the sintering process.</p>
