Issue 4, 2018

Tuning mobility and stability of lithium ion conductors based on lattice dynamics

Abstract

Lithium ion conductivity in many structural families can be tuned by many orders of magnitude, with some rivaling that of liquid electrolytes at room temperature. Unfortunately, fast lithium conductors exhibit poor stability against lithium battery electrodes. In this article, we report a fundamentally new approach to alter ion mobility and stability against oxidation of lithium ion conductors using lattice dynamics. By combining inelastic neutron scattering measurements with density functional theory, fast lithium conductors were shown to have low lithium vibration frequency or low center of lithium phonon density of states. On the other hand, lowering anion phonon densities of states reduces the stability against electrochemical oxidation. Olivines with low lithium band centers but high anion band centers are promising lithium ion conductors with high ion conductivity and stability. Such findings highlight new strategies in controlling lattice dynamics to discover new lithium ion conductors with enhanced conductivity and stability.

Graphical abstract: Tuning mobility and stability of lithium ion conductors based on lattice dynamics

Supplementary files

Article information

Article type
Paper
Submitted
27 Nov 2017
Accepted
20 Feb 2018
First published
20 Feb 2018
This article is Open Access
Creative Commons BY license

Energy Environ. Sci., 2018,11, 850-859

Tuning mobility and stability of lithium ion conductors based on lattice dynamics

S. Muy, J. C. Bachman, L. Giordano, H. Chang, D. L. Abernathy, D. Bansal, O. Delaire, S. Hori, R. Kanno, F. Maglia, S. Lupart, P. Lamp and Y. Shao-Horn, Energy Environ. Sci., 2018, 11, 850 DOI: 10.1039/C7EE03364H

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