open access

https://hdl.handle.net/2115/90121

Synthesis of highly Li-ion conductive garnet-type solid ceramic electrolytes by solution-process-derived sintering additives

英語

Sintering

2021-10

Elsevier

Journal of the European ceramic society

41(13)

6767-6771

The sintering and processing of garnet-type solid ceramic electrolytes (e.g., Li7La3Zr2O12 (LLZ)) are challenging because the material composition and microstructure at high temperatures must be carefully controlled to obtain the stabilization of highly conductive cubic phase and dense ceramic. Liquid-phase sintering using sintering aids is typically used for densifying ceramic materials, as it is a faster and/or lower-temperature process. In this study, we used solution-process-derived sintering additives to sinter garnet-type solid electrolytes highly effective in terms of relative density and properties at 1000 degrees C (10 h). The liquid phase formation during the sintering was rationalized to establish the optimal sintering conditions. The use of 1.2-vol% 75Li(2)O center dot 25B(2)O(3) and 1.5-vol% Al2O3 as sintering additives was highly effective in densifying a Ta-doped LLZ, achieving a high ionic conductivity of 0.8 mS cm(-1) (25 degrees C) with low activation energy (9 kJ mol(-1)) and almost negligible contribution of the grain boundary resistance (10 %).

学術雑誌論文

Accepted Manuscript

Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

© 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

0955-2219