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

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Muy, S; Bachman, JC; Giordano, L; Chang, HH; Abernathy, DL; Bansal, D; Delaire, O; Hori, S; Kanno, R; Maglia, F; Lupart, S; Lamp, P; Shao-Horn, Y

Published Date

  • April 1, 2018

Published In

Volume / Issue

  • 11 / 4

Start / End Page

  • 850 - 859

Electronic International Standard Serial Number (EISSN)

  • 1754-5706

International Standard Serial Number (ISSN)

  • 1754-5692

Digital Object Identifier (DOI)

  • 10.1039/c7ee03364h

Citation Source

  • Scopus