Neutron Scattering Studies of Lithium-Ion Diffusion in Ternary Phosphate Glasses

Published

June 30, 2016

Author(s)

Gavin Hester, Tom Heitmann, Madhu Sudan Tyagi, Munesh Rathore, Anshuman Dalvi, Saibal Mitra

Abstract

We have studied the diffusion mechanism of lithium ions in glassy oxide-based solid sate electrolytes using elastic and electrolytes using elastic and quasielastic neutron scattering. Samples of xLi₂SO_4-(1-x)(Lid2^O-P₂O₅) were prepared using conventional melt techniques. Elastic and inelastic scattering measurements were performed using the triple-axis spectrometer (TRIAX) at Missouri University Research Reactor at University of Missouri and High Flux Backscattering Spectrometer (HFBS) at NIST Center for Neutron Research, respectively. These compounds have a base glass compound of P₂O₅ which is modified with Li₂O. Addition of Li₂SO₄ leads to the modification of the structure and to an increase lithium ion (Li⁺) conduction. We find that an increase of Li₂SO₄ in the compounds to an increase in Li⁺ diffusion until an over-saturation point is reached (<60%Li₂SO₄). We find that the hopping mechanism is best described by the vacancy mediated Chudley-Elliot model. A fundamental understanding of the diffusion process for these glassy compounds can help lead to the development of a highly efficient solid electrolyte and improve the viability of clean energy technologies.

Citation

MRS Advances

Volume

1

Issue

45

Pub Type

Journals

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Keywords

Lithium ion diffusion, neutron scattering

Citation

Hester, G. , Heitmann, T. , Tyagi, M. , Rathore, M. , Dalvi, A. and Mitra, S. (2016), Neutron Scattering Studies of Lithium-Ion Diffusion in Ternary Phosphate Glasses, MRS Advances, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=921258 (Accessed April 19, 2024)