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High Li-ion conductivity in tetragonal LGPO: a comparative first-principles study against known LISICON and LGPS phases

Giulliana Materzanini1,2*, Leonid Kahle1,2*, Aris Marcolongo3,2*, Nicola Marzari1,2*

1 Theory and Simulations of Materials (THEOS), École Polytechnique Fedérale de Lausanne, 1015 Lausanne, Switzerland

2 National Centre for Computational Design and Discovery of Novel Materials (MARVEL), 1015 Lausanne, Switzerland

3 IBM RSM Zurich Research Laboratory, Zurich, Switzerland

* Corresponding authors emails: giuliana.materzanini@epfl.ch, leonid.kahle@gmail.com, aris.marcolongo@gmail.com, nicola.marzari@gmail.com
DOI10.24435/materialscloud:rs-1t [version v1]

Publication date: Jan 22, 2021

How to cite this record

Giulliana Materzanini, Leonid Kahle, Aris Marcolongo, Nicola Marzari, High Li-ion conductivity in tetragonal LGPO: a comparative first-principles study against known LISICON and LGPS phases, Materials Cloud Archive 2021.15 (2021), doi: 10.24435/materialscloud:rs-1t.

Description

This work presents extensive first-principles (Car-Parrinello) molecular dynamics simulations of the solid-state electrolyte Li10GeP2O12 (LGPO) in a tetragonal phase -not synthesized so far- that is isostructural to the highly Li-ion conductive tetragonal phase of the sulfide analogue Li10GeP2S12 (LGPS). We provide comparative simulations of the experimentally known orthorhombic phase of LGPO (that we call here LISICON, from the family of superionic conductors to which LGPO belongs) and of the two experimentally known phases of LGPS, quasi-orthorhombic (called thio-LISICON) and tetragonal. We extract diffusion coefficients from fixed-cell simulations in the canonical ensemble and we study dynamical stability from variable-cell simulations in the isobaric-isothermal ensemble. The main outcome of this work is that, according to these simulations, although tetragonal LGPO is less stable than its orthorhombic allotrope, it exhibits a much higher conductivity, comparable to that presently estimated for both phases of LGPS. These results indicate that hypothetical tetragonal LGPO, if synthesized, could make a very attractive Li-ion conductor.

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File name Size Description
STRUCTURES.tar.gz
MD5md5:b56fa800b7e854344b8a3bc2c531916a
15.4 KiB Structural data of the LGPO and LGPS phases studied in the record
TRAJECTORIES.tar.gz
MD5md5:da3da23fce1d918c8b46ba30016a838f
14.1 GiB Data of the first-principles molecular dynamics simulations presented and discussed in the record
README.txt
MD5md5:80095946214bf0ea85a3826beafc5cd9
2.6 KiB Brief description of "STRUCTURES.tar.gz" and "TRAJECTORIES.tar.gz" archives content

License

Files and data are licensed under the terms of the following license: Creative Commons Attribution 4.0 International.
Metadata, except for email addresses, are licensed under the Creative Commons Attribution Share-Alike 4.0 International license.

External references

Journal reference (Paper in which the data are presented and discussed)
G. Materzanini, L. Kahle, A. Marcolongo, N. Marzari, Phys. Rev. Mater. (under revision after resubmission)
Preprint (Open access reference (to be modified once the paper is accepted, as a general reformulation of the structure of the paper has been done))

Keywords

solid-state electrolytes first-principles molecular dynamics LISICON LGPO LGPS ionic transport dynamical stability ionic conductivity MARVEL/Inc1 SNSF CSCS

Version history:

2021.15 (version v1) [This version] Jan 22, 2021 DOI10.24435/materialscloud:rs-1t