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Investigation of glass-ceramic lithium thiophosphate solid electrolytes using NMR and neutron scattering

Journal Article · · Materials Today Physics
Solid-state Li batteries require solid electrolytes which have high Li+ conductivity and good chemical/mechanical compatibility with Li metal anodes and high energy cathodes. Structure/function correlations which relate local bonding to macroscopic properties are needed to guide development of new solid electrolyte materials. This study combines diffraction measurements with solid-state nuclear magnetic resonance spectroscopy (ssNMR) and neutron pair distribution function (nPDF) analysis to probe the short-range vs. long-range structure of glass-ceramic Li3PS4-based solid electrolytes. Here, we demonstrate how different synthesis conditions (e.g., solvent selection and thermal processing) affect the resulting polyanionic network. More specifically, structures with high P coordination numbers (e.g., PS43– and P2S74–) correlate with higher Li+ mobility compared to other polyanions (e.g., (PS3)nn– chains and P2S64–). Overall, this work demonstrates how ssNMR and nPDF can be used to draw key structure/function correlations for solid-state superionic conductors.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; US Department of the Navy, Office of Naval Research (ONR); National Institutes of Health (NIH)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1823360
Alternate ID(s):
OSTI ID: 1810168
Journal Information:
Materials Today Physics, Journal Name: Materials Today Physics Vol. 21; ISSN 2542-5293
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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