Tuning mobility and stability of lithium ion conductors based on lattice dynamics
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c7ee03364h.pdf
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Author(s)
Abernathy, Douglas L.
Bansal, Dipanshu
Delaire, Olivier
Hori, Satoshi
Kanno, Ryoji
Maglia, Filippo
Lupart, Saskia
Lamp, Peter
Muy, Sokseiha
Bachman, Chris
Date Issued
February 2018
Journal
Energy & Environmental Science
Publisher
Royal Society of Chemistry
Citation
Muy, Sokseiha et al. “Tuning Mobility and Stability of Lithium Ion Conductors Based on Lattice Dynamics.” Energy & Environmental Science 11, 4 (2018): 850–859. doi:10.1039/c7ee03364h. © 2018 The Author(s)
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Creative Commons Attribution 3.0 unported license
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DOI of Published Version
https://doi.org/10.1039/C7EE03364H
