Supervalent doping and its effect on the thermal, structural and electrochemical properties of Li7La3Zr2O12 solid electrolytes
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
Major/Subject
Mcode
Degree programme
Language
en
Pages
15
Series
Materials Advances, Volume 5, issue 12, pp. 5260-5274
Abstract
Supervalent doping is one of the most common methods used to stabilize the highly conductive cubic phase of Li7La3Zr2O12 (LLZO) solid electrolytes. While several different doping elements have shown that they are capable of stabilizing the cubic LLZO structure, there is still no clear consensus as to an optimal doping strategy. In this study we present one of the most extensive comparative analyses on supervalent doping of LLZO done to date. Herein, we compare the effects of eight different doping elements (Al, Ga, Fe, Ta, Nb, Sb, W and Mo) on the synthesis, crystal structure, morphology, and electrochemical properties of LLZO. We also propose a new guideline that would allow for the quick and easy identification of doping elements in LLZO and the estimation of their concentration using Raman spectroscopy. Our results show how Ga doping leads to exceptionally high ionic conductivities (1.30 × 10−3 S cm−1) and low activation energies (0.26 eV) due to changes in the crystal symmetry of LLZO. On top of that, Ga doping also significantly lowers the required synthesis temperatures and increases the relative density of the LLZO structure, making Ga the most suitable element for LLZO doping. On the other hand, Nb doping shows the lowest ionic conductivity (1.91 × 10−4 S cm−1) and a high activation energy (0.44 eV) of the investigated dopants, due to a poor sintering performance.Description
Publisher Copyright: © 2024 RSC.
Keywords
Other note
Citation
Košir, J, Mousavihashemi, S, Suominen, M, Kobets, A, Wilson, B P, Rautama, E-L & Kallio, T 2024, 'Supervalent doping and its effect on the thermal, structural and electrochemical properties of Li 7 La 3 Zr 2 O 12 solid electrolytes', Materials Advances, vol. 5, no. 12, pp. 5260-5274. https://doi.org/10.1039/d4ma00119b