1 research outputs found
Effect of Gallium Substitution on Lithium-Ion Conductivity and Phase Evolution in Sputtered Li<sub>7–3<i>x</i></sub>Ga<i><sub>x</sub></i>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> Thin Films
Replacing
the liquid electrolyte in conventional lithium-ion batteries
with thin-film solid-state lithium-ion conductors is a promising approach
for increasing energy density, lifetime, and safety. In particular,
Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> is appealing
due to its high lithium-ion conductivity and wide electrochemical
stability window. Further insights into thin-film processing of this
material are required for its successful integration into solid-state
batteries. In this work, we investigate the phase evolution of Li<sub>7–3<i>x</i></sub>Ga<i><sub>x</sub></i>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> in thin films with various
amounts of Li and Ga for stabilizing the cubic phase. Through this
work, we gain valuable insights into the crystallization processes
unique to thin films and are able to form dense Li<sub>7–3<i>x</i></sub>Ga<i><sub>x</sub></i>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> layers stabilized in the cubic phase with high
in-plane lithium-ion conductivities of up to 1.6 × 10<sup>–5</sup> S cm<sup>–1</sup> at 30 °C. We also note the formation
of cubic Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> at
the relatively low temperature of 500 °C