Temperature- and vacancy-concentration-dependence of heat transport in Li₃ClO from multi-method numerical simulations
Creators
- 1. SISSA—Scuola Internazionale Superiore di Studi Avanzati, 34136 Trieste, Italy
- 2. CNR—Istituto Officina dei Materiali, SISSA, 34136 Trieste, Italy
- 3. COSMO—Laboratory of Computational Science and Modelling, IMX, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
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Description
Despite governing heat management in any realistic device, the microscopic mechanisms of heat transport in all-solid-state electrolytes are poorly known: existing calculations, all based on simplistic semi-empirical models, are unreliable for superionic conductors and largely overestimate their thermal conductivity. In this work, we deploy a combination of state-of-the-art methods to calculate the thermal conductivity of a prototypical Li-ion conductor, the Li₃ClO antiperovskite. By leveraging ab initio, machine learning, and forcefield descriptions of interatomic forces, we are able to reveal the massive role of anharmonic interactions and diffusive defects on the thermal conductivity and its temperature dependence, and to eventually embed their effects into a simple rationale which is likely applicable to a wide class of ionic conductors. In this record, we provide data and scripts to generate the plots supporting our findings. We also provide the machine learning model and the dataset to train it.
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References
Journal reference (Paper where the data is discussed) P. Pegolo, S. Baroni, F. Grasselli, npj Comput Mater 8, 24 (2022), doi: 10.1038/s41524-021-00693-4
Preprint (Preprint where the data is discussed.) P. Pegolo, S. Baroni, F. Grasselli, arXiv:2111.14976 [cond-mat.mtrl-sci]