High lithium ionic conductivity in the garnet-type oxide Li7−X La3(Zr2−X, NbX)O12 (X = 0–2)

✍ Scribed by Shingo Ohta; Tetsuro Kobayashi; Takahiko Asaoka

• Book ID: 104026444
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 425 KB
• Volume: 196
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2010.11.089

✦ Synopsis

Lithium garnet-type oxides Li7−X
La3(Zr2−X
, Nb
X
)O12 (X
=0–2) were synthesized by a solid-state reaction, and their lithium ion conductivity was measured using an AC impedance method at temperatures ranging from 25 to 150°C in air. The lithium ion conductivity increased with increasing Nb content, and reached a maximum of ∼0.8mScm−1 at 25°C. By contrast, the activation energy reached a minimum of ∼30kJmol−1 at the same point with X
=0.25. The potential window was examined by cyclic voltammetry (CV), which showed lithium deposition and dissolution peaks around 0V vs. Li+/Li, but showed no evidence of other reactions up to 9V vs. Li+/Li.