DataVXAdvanced Energy MaterialsPaper
journal article·2022-06Open access

Considering the Role of Ion Transport in Diffuson‐Dominated Thermal Conductivity

Tim Bernges, Riley Hanus, Bjoern Wankmiller, Kazuki Imasato, Siqi Lin, Michael Ghidiu, Marius Gerlitz, Martin Peterlechner, Samuel Graham, Geoffroy Hautier, Yanzhong Pei, Michael Ryan Hansen, Gerhard Wilde, G. Jeffrey Snyder, Janine George, Matthias T. Agne, Wolfgang G. Zeier

Advanced Energy Materials· Volume 12· Issue 22
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Abstract

Abstract Next‐generation thermal management requires the development of low lattice thermal conductivity materials, as observed in ionic conductors. For example, thermoelectric efficiency is increased when thermal conductivity is decreased. Detrimentally, high ionic conductivity leads to thermoelectric device degradation. Battery safety and design also require an understanding of thermal transport in ionic conductors. Ion mobility, structural complexity, and anharmonicity have been used to explain the thermal transport properties of ionic conductors. However, thermal and ionic transport are rarely discussed in direct comparison. Herein, the ionic conductivity of Ag + argyrodites is found to change by orders of magnitude without altering the thermal conductivity. Thermal conductivity measurements and two‐channel lattice dynamics modeling reveal that the majority of Ag + vibrations have a non‐propagating diffuson‐like character, similar to amorphous materials. It is found that high ionic mobility is not a requirement for diffuson‐mediated transport. Instead, the same bonding and structural traits that can lead to fast ionic conduction also lead to diffuson‐mediated transport. Bridging the fields of solid‐state ionics and thermal transport, it is proposed that a vibrational perspective can lead to new design strategies for functional ionic conducting materials. As a first step, the authors relate the so‐called Meyer–Neldel behavior in ionic conductors to phonon occupations.
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Research context

Energy storage

OpenAlex topics: Advanced Battery Materials and Technologies · Advanced Thermoelectric Materials and Devices · Thermal Expansion and Ionic Conductivity

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Inorganic and Analytical Chemistry University of Münster D‐48149 Münster Germany

George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332 USA

Institute of Physical Chemistry University of Münster D‐48149 Münster Germany

International Graduate School for Battery Chemistry Characterization Analysis Recycling and Application (BACCARA) University of Münster D‐48149 Münster Germany

Global Zero Emission Research Center National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki 305‐8569 Japan

Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University Shanghai 201804 China

Institute of Materials Physics University of Münster D‐48149 Münster Germany

Institute of Condensed Matter and Nanoscience Université Catholique de Louvain 1348 Ottignies‐Louvain‐la‐Neuve Belgium

Dartmouth College Thayer School of Engineering Hanover NH 03755 USA

Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA

Federal Institute for Materials Research and Testing (BAM) D‐12205 Berlin Germany

Institute of Condensed Matter Theory and Solid‐State Optics Friedrich Schiller University 07743 Jena Germany

Institut für Energie‐ und Klimaforschung (IEK) IEK‐12: Helmholtz‐Institut Münster Forschungszentrum Jülich 48149 Münster Germany

Funding

Deutsche Forschungsgemeinschaft

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