Effect of extra Li content on the property of tetragonal Li7La3Zr2O12 solid electrolyte prepared by auto-consolidation method

DOI

10.2991/icmmct-17.2017.46How to use a DOI?

Keywords

Li7La3Zr2O12 solid state electrolyte, ionic conductivity, tetragonal structure.

Abstract

For all-solid-state lithium ion battery, Li7La3Zr2O12 (LLZO) is a unique solid electrolyte possessing both high total ionic conductivity and stability against Li. As to conventional preparation methods, there is a stereotype that higher density always comes from higher pressure enforced upon the LLZO pellets. A different way called "auto-consolidation" was provided by us. Without the demand of pressing operations, the preparation process is greatly simplified. The surface tension of liquid Li2O at sintering temperature is the key factor for samples to consolidate. In this paper, the effect of extra Li content (0-25%) on the property of tetragonal LLZO was studied. Results show that only when the extra Li content reaches up to 10%, can dense tetragonal LLZO be gained. The optimized extra content value is about 15% with a relative density about 93% and a total conductivity of 5.6×10-5 S cm-1 at 30 oC, which is the highest one for tetragonal LLZO in reported issues, about two times higher than that prepared by hot-pressing method. At 30-100 oC, the activation energies for total conductivity are about 0.30~0.42 eV atom-1, decreasing with the increasing of extra Li content, which is slightly lower than the previous reported values. This work suggests a simple and reliable route for the preparation of ceramic solid electrolytes.

Copyright

© 2017, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - PengCheng Zhao
AU  - Gaoping Cao
AU  - Zhaoqing Jin
AU  - Hai Ming
AU  - Yuehua Wen
AU  - Yan Xu
AU  - Yu Xiang
AU  - Xiayu Zhu
AU  - Songtong Zhang
PY  - 2017/04
DA  - 2017/04
TI  - Effect of extra Li content on the property of tetragonal Li7La3Zr2O12 solid electrolyte prepared by auto-consolidation method
BT  - Proceedings of the 2017 5th International Conference on Machinery, Materials and Computing Technology (ICMMCT 2017)
PB  - Atlantis Press
SP  - 237
EP  - 242
SN  - 2352-5401
UR  - https://doi.org/10.2991/icmmct-17.2017.46
DO  - 10.2991/icmmct-17.2017.46
ID  - Zhao2017/04
ER  -