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

Author(s)
Abernathy, Douglas L.; Bansal, Dipanshu; Delaire, Olivier; Hori, Satoshi; Kanno, Ryoji; Maglia, Filippo; Lupart, Saskia; Lamp, Peter; Muy, Sokseiha; Bachman, Chris; Giordano, Livia; Chang, Hao Hsun; Shao-Horn, Yang; ... Show more Show less
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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.
Date issued
2018-02
URI
http://hdl.handle.net/1721.1/121071
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
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
ISSN
1754-5692
1754-5706

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