Molecular design effects of alkoxide-derived precursor solution on low-temperature crystallization of cubic garnet type Li ion conductor

Abstract

Cubic garnet-type Li ion conductor such as Li7La3Zr1.75Ta0.25O12 (c-LLZTO) are promising materials to develop all-solid-ceramic type Li ion batteries. For this study, we prepared c-LLZTO through the metal alkoxide route with chemical modification. Results show that chemical modification using acetic acid and distilled water for the partial hydrolysis lowered the crystallization temperature of the c-LLZTO with mono-phase at 973 K under ambient atmosphere. The obtained c-LLZTO with 63 nm crystallite size was sintered at 1373 K for 3 h to obtain a dense c-LLZTO pellet. The Li ion conductivity of the sintered c-LLZTO pellet exhibited higher ion conductivity of 3.48 × 10-4 Scm−1 at 300 K than those of the reported chemical-solution-derived cubic garnet-type Li ion conductors.