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

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 fundamenta...

Full description

Saved in:
Bibliographic Details
Published in:Energy & environmental science 2018-04, Vol.11 (4), p.85-859
Main Authors: Muy, Sokseiha, Bachman, John C, Giordano, Livia, Chang, Hao-Hsun, Abernathy, Douglas L, Bansal, Dipanshu, Delaire, Olivier, Hori, Satoshi, Kanno, Ryoji, Maglia, Filippo, Lupart, Saskia, Lamp, Peter, Shao-Horn, Yang
Format: Article
Language:English
Subjects:
Anions
Batteries
Chemistry
Conductivity
Conductors
Control stability
Density functional theory
Dynamic stability
Electrochemical oxidation
Electrochemistry
Energy & Fuels
ENERGY STORAGE
Engineering
Environmental Sciences & Ecology
Inelastic scattering
Ionic mobility
Ions
Lithium
Lithium batteries
Lithium ions
Mobility
Neutron scattering
Oxidation
Vibration
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. Ionic conductivity and stability of Li-ion conductors are rationalized on the same footing using lattice-dynamics descriptors.
ISSN:1754-5692
1754-5706
DOI:10.1039/c7ee03364h