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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 xLi2SO4-(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.
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 October 10, 2025)