Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5149808 | Journal of Power Sources | 2017 | 6 Pages |
Abstract
For conventional preparation methods of Li7La3Zr2O12 (LLZO) solid state electrolytes, there is a stereotype that higher density always comes from higher pressure enforced upon the LLZO pellets. In this paper, a different way with an auto-consolidation mechanism is provided and discussed. No pressing operations are employed during the whole preparation process. Due to the surface tension of liquid melted Li2O at sintering temperature, LLZO particles could aggregate together freely and automatically. The preparation process for dense LLZO is greatly simplified. A dense tetragonal LLZO with high relative density about 93% has been prepared successfully by this auto-consolidation method. And there are no voids observed in the SEM images. At 30 °C, the total conductivity is about 5.67 Ã 10â5 S cmâ1, which is the highest one for tetragonal LLZO in the reported issues, even two times higher than that prepared by hot-pressing method. The activation energy for total conductivity is â¼0.35 eV atomâ1 at 30-120 °C, slightly lower than the previous reported values. This work sheds light on the understanding of the consolidation mechanism for solid electrolytes and suggests a reliable route to syhthesize cemanic solid electrolytes.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Pengcheng Zhao, Yuehua Wen, Jie Cheng, Gaoping Cao, Zhaoqing Jin, Hai Ming, Yan Xu, Xiayu Zhu,