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Title: Reactivity-Guided Interface Design in Na Metal Solid-State Batteries

Journal Article · · Joule

Solid-state batteries provide substantially increased safety and improved energy density when energy-dense alkali metal anodes are applied. However, most solid-state electrolytes react with alkali metals, causing a continuous increase of the cell impedance. Here, we employ a reactivity-driven strategy to improve the interfacial stability between a Na3SbS4 solid-state electrolyte and sodium metal. First-principles calculations identify a protective hydrate coating for Na3SbS4 that leads to the generation of passivating decomposition products upon contact of the electrolyte with sodium metal. The formation of this protective coating, a newly discovered hydrated phase, is achieved experimentally through exposure of Na3SbS4 to air. The buried interface is characterized using post-operando synchrotron X-ray depth profiling, providing spatially resolved evidence of the multilayered phase distribution in the Na metal symmetric cell consistent with theoretical predictions. We identify hydrates as promising for improving the metal/electrolyte interfacial stability in solid-state batteries and suggest a general strategy of interface design for this purpose.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
3F-31144; AC02-06CH11357; AC02-05CH11231
OSTI ID:
1506559
Alternate ID(s):
OSTI ID: 1604683
Journal Information:
Joule, Journal Name: Joule Vol. 3 Journal Issue: 4; ISSN 2542-4351
Publisher:
Elsevier - Cell PressCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 84 works
Citation information provided by
Web of Science

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Cited By (7)

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First Principle Material Genome Approach for All Solid‐State Batteries journal September 2019
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Designing solid-state electrolytes for safe, energy-dense batteries journal February 2020
Theoretical tuning of Ruddlesden–Popper type anti-perovskite phases as superb ion conductors and cathodes for solid sodium ion batteries journal January 2019
Theoretical formulation of Na 3 AO 4 X (A = S/Se, X = F/Cl) as high-performance solid electrolytes for all-solid-state sodium batteries journal January 2019
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