Issue 1, 2023

Metastable properties of a garnet type Li5La3Bi2O12 solid electrolyte towards low temperature pressure driven densification

Abstract

Solid state electrolytes represent an attractive alternative to liquid electrolytes for rechargeable batteries. However, the fabrication of batteries with ceramic materials requires high temperature that could be detrimental to their electrochemical performance. In this work, we show that it's possible to densify a garnet-type Li5La3Bi2O12 solid electrolyte at low temperature (600 °C) with respect to standard high sintering temperature (T > 1000 °C) used for zirconium-based Li7La3Zr2O12 doped garnet. Li5La3Bi2O12 showed a high conductivity (1.2 × 10−4 S cm−1) after hot pressing at 600 °C. The synthesis conditions have been optimized: at 700 °C we observed the presence of the LiLa2O3.5 phase as a consequence of LLBO metastability, and the formation mechanism has been described by density functional theory (DFT) and density functional perturbation theory (DFPT) calculations. Moreover, we have reported the application of small amounts of LLBO as a sintering aid (5–10%) in the densification of LLZTO. Our investigation successfully demonstrated that LLBO introduction positively affects the densification process and global performances of LLZTO garnet, allowing us to obtain an ionic conductivity higher than 10−4 S cm−1 after annealing at 600 °C.

Graphical abstract: Metastable properties of a garnet type Li5La3Bi2O12 solid electrolyte towards low temperature pressure driven densification

Supplementary files

Article information

Article type
Paper
Submitted
27 May 2022
Accepted
27 Nov 2022
First published
28 Nov 2022

J. Mater. Chem. A, 2023,11, 364-373

Metastable properties of a garnet type Li5La3Bi2O12 solid electrolyte towards low temperature pressure driven densification

D. Campanella, S. Krachkovskiy, G. Bertoni, G. C. Gazzadi, M. Golozar, S. Kaboli, S. Savoie, G. Girard, A. C. Gheorghe Nita, K. Okhotnikov, Z. Feng, A. Guerfi, A. Vijh, R. Gauvin, D. Bélanger and A. Paolella, J. Mater. Chem. A, 2023, 11, 364 DOI: 10.1039/D2TA04259B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements