In this study, we fabricated and characterized two kinds of Al-doped Li6.2La3Zr2O12 (LLZO) powders with the modified sol–gel synthesis and solid-state processing, respectively. Moreover, the two kinds of LLZO powders were compared in
detail examining the powder size and processing window for the cubic phase. In the case of the sol–gel synthesis, the processed powder exhibited a pure cubic phase with little secondary phases such as Li-deficient pyrochlore or LaAlO3 at calcination temperatures above 900
°C and a mixed phase of cubic and tetragonal structure at 800 °C. However, in the solid-state processed powder, the tetragonal phase was converted to a cubic one at a temperature of 1000 °C. When the amount of Li addition was varied, sol–gel synthesized LLZO powder also had
a much wider range for cubic phases than that of the solid-state processed one. The sol–gel LLZO powder with a Li addition of 7.13 mol. showed an average grain size of 429 nm and a specific BET surface area of 5.34 m2/g. The formation of the cubic phase with few secondary
ones was sensitive to Al doping amount. The results of this study suggest that the sol–gel process is the more optimum method for obtaining the cubic phase of LLZO powder for highly dense and conductive solid electrolyte ceramics.
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Document Type: Research Article
Department of Advanced Materials Engineering, Korea Polytechnic University, Siheung, Gyeonggi 15073, Korea
Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
Publication date: November 1, 2016
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