Probing Li ion dynamics in amorphous xLi 2 SO 4 ⋅(1 − x)LiPO 3 by quasielastic neutron scattering

Abstract

The diffusion dynamics of a series of lithium sulfate substituted phosphate glass materials xLi 2 SO 4 ⋅(1 − x)LiPO 3 has been probed by quasielastic neutron scattering. Amorphous Li ion conductors are attractive as electrolyte materials for all-solid state batteries because they are highly isotropic and chemically stable. Local disorder is expected to reduce barriers to ion migration – leading to improved ionic conductivity relative to their crystalline counterpart – while minimizing unwanted electron transport. We report Li self-diffusion in these materials on a length scale comparable to the interatomic spacings, obtaining values D ≃ 55 ± 4 × 10 −8 cm 2 /s at 450 K. Elastic neutron scattering measurements show an alteration of the phosphate chain backbone of the glass material.

Department(s)

Physics, Astronomy, and Materials Science

Document Type

Article

DOI

https://doi.org/10.1016/j.ssi.2019.02.004

Keywords

Li diffusion, Quasielastic neutron scattering, Solid electrolyte

Publication Date

6-1-2019

Journal Title

Solid State Ionics

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