Journal article

Publication year: 2017

Pages: 8859-8869

Journal: Chemistry of Materials

Volume number: 29

Issue number: 20

ISSN: 0897-4756

eISSN: 1520-5002

DOI Link: https://doi.org/10.1021/acs.chemmater.7b03474

Publisher: American Chemical Society

Abstract: 
Li+- and Na+-conducting thiophosphates have attracted much interest because of their intrinsically high ionic conductivities and the possibility to be employed in solid-state batteries. Inspired by the recent finding of the influence of changing lattice vibrations and induced lattice softening on the ionic transport of Li+-conducting electrolytes, here we explore this effect in the Na+ conductor Na3PS4-xSex. Ultrasonic speed of sound measurements are used to monitor a changing lattice stiffness and Debye frequencies. The changes in the lattice dynamics are complemented by X-ray diffraction and electrochemical impedance spectroscopy. With systematic alteration of the polarizability of the anion framework, a softening of the lattice can be observed that leads to a reduction of the activation barrier for migration as well as. a decreased Arrhenius prefactor. This-Work shows that, similar to Li+ transport, the softening of the average vibrational frequencies of the lattice has a tremendous effect on Na+-ionic transport and that ion-phonon interactions need to be considered in solid electrolytes.

Harvard Citation style: Krauskopf, T., Pompe, C., Kraft, M. and Zeier, W. (2017) Influence of Lattice Dynamics on Na⁺ Transport in the Solid Electrolyte Na₃PS_4-xSe_x, Chemistry of Materials, 29(20), pp. 8859-8869. https://doi.org/10.1021/acs.chemmater.7b03474

APA Citation style: Krauskopf, T., Pompe, C., Kraft, M., & Zeier, W. (2017). Influence of Lattice Dynamics on Na⁺ Transport in the Solid Electrolyte Na₃PS_4-xSe_x. Chemistry of Materials. 29(20), 8859-8869. https://doi.org/10.1021/acs.chemmater.7b03474