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

Published online by Cambridge University Press:  30 June 2016

Gavin Hester ,
Tom Heitmann ,
Madhusudan Tyagi ,
Munesh Rathore ,
Anshuman Dalvi  and
Saibal Mitra
Gavin Hester
Affiliation:
Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO 65897, U.S.A.
Tom Heitmann
Affiliation:
University of Missouri Research Reactor, University of Missouri, Columbia, MO 65211, U.S.A.
Madhusudan Tyagi
Affiliation:
NIST Center for Neutron Research, Gaithersburg, MD 20899, U.S.A. Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742 USA.
Munesh Rathore
Affiliation:
Physics Department, Birla Institute of Technology and Science, Pilani, RJ 333031, India.
Anshuman Dalvi
Affiliation:
Physics Department, Birla Institute of Technology and Science, Pilani, RJ 333031, India.
Saibal Mitra*
Affiliation:
Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO 65897, U.S.A.
*
*Author to whom correspondence should be addressed: SaibalMitra@missouristate.edu
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Abstract

We have studied the diffusion mechanism of lithium ions in glassy oxide-based solid state electrolytes using elastic and quasielastic neutron scattering. Samples of xLi2SO4-(1-x)(Li2O-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 leads to an increase in the Lorentzian width of the fit for the quasielastic data, which corresponds 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.

Keywords

neutron scatteringdiffusionamorphous
Type
Articles
Information
MRS Advances , Volume 1 , Issue 45: Energy and Environment , 2016 , pp. 3057 - 3062
Copyright
Copyright © Materials Research Society 2016 

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References

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