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

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 & DEG;C in a nitrogen atmosphere from the XRD patterns. The charge/discharge behavior of the electrochemical measuring cell (when using a nonaqueous 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, rutiletype TiO2 as anode material was 3 times higher discharge capacity than anatase-type TiO2 at current value 25.6 & mu;A 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.