# MLZ User Meeting 2021

Dec 7 – 8, 2021 Online only
Europe/Berlin timezone

## Lithium Diffusion and Ionic Conductivity in Lithium Phosphidotetrelates

Only available for registered users!
Dec 7, 2021, 10:30 AM
1h 30m
Board: P-24
Poster Structure Research

### Speaker

Dr Stefan Strangmüller (Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II))

### Description

High-performance energy storage solutions are a basic prerequisite for efficient portable devices and the electrification of the transport sector, and by this reaching the CO$_{2}$ emission targets. The market and progress demand for advances in electrochemical energy storage and a promising approach towards advanced batteries is the so-called all solid state battery concept, where the liquid electrolyte is replaced by a solid state ion conductor.
In this context, search for new types of lithium-permeating membranes along with detailed investigations of potential solid electrolytes are required. The key target is the understanding of structure-property relationships of solid ion conductors, which is inevitable for a purposeful tailoring of a batch of properties directly relevant for applications.
Material classes such as the family of lithium phosphidotetrelates and -trielates, which contain numerous compounds that combine both a great structural variety and closely related structures, are of particular importance because of their diversity, high lithium conductivity, processability etc.$^{[1-3]}$ Herein, the details of lithium diffusion in a series of structurally related fast ion conducting phosphidotetrelates (e.g., Li$_{14}Tt$P$_6$ and (α-/β-)Li$_8Tt$P$_4$; $Tt$ = Si, Ge, Sn) are analyzed and compared with respect to the corresponding materials properties. Applying electrochemical impedance spectroscopy and temperature-dependent powder neutron diffraction experiments in combination with the maximum entropy method as well as one-particle potential analysis, enables a thorough study of lithium transport in this class of materials.

[1] S. Strangmüller, et al., J. Am. Chem. Soc., 2019, 141, 14200-14209.
[2] T. M. F. Restle, et al., Angew. Chem., Int. Ed., 2020, 59, 5665-5674.
[3] S. Strangmüller, et al., J. Mater. Chem. A, 2021, 9, 15254-15268.

### Primary author

Dr Stefan Strangmüller (Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II))

### Co-authors

Dr Anatoliy Senyshyn (Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II)) Prof. Thomas F. Fässler (TUM, Lehrstuhl für anorganische Chemie)