Highly Mobile Ions: Low-Temperature NMR Directly Probes Extremely Fast Li+ Hopping in Argyrodite-Type Li6PS5Br

The development of safe and long-lasting all-solid-state lithium-ion batteries needs electrolytes with exceptionally good transport properties. Here, we report on the combination of several solid-state nuclear magnetic resonance (NMR) techniques which have been used to precisely probe short-range as...

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Bibliographic Details
Published inThe journal of physical chemistry letters Vol. 4; no. 13; pp. 2118 - 2123
Main Authors Epp, Viktor, Gün, Özgül, Deiseroth, Hans-Jörg, Wilkening, Martin
Format Journal Article
LanguageEnglish
Published American Chemical Society 03.07.2013
Subjects
Kinetics and Dynamics
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Summary:The development of safe and long-lasting all-solid-state lithium-ion batteries needs electrolytes with exceptionally good transport properties. Here, we report on the combination of several solid-state nuclear magnetic resonance (NMR) techniques which have been used to precisely probe short-range as well as long-range Li+ dynamics in Li6PS5Br from an atomic-scale point of view. NMR data clearly reveal an extraordinary high Li diffusivity. This manifests in so-called diffusion-induced spin–lattice relaxation NMR rate peaks showing up at temperatures as low as 260 K. From a quantitative point of view, at ambient temperature the Li jump rate is of the order of 109 s–1 which corresponds to a Li+ conductivity in order of 10–3 to 10–2 S/cm, thus, indicating “liquid-like” Li+ diffusion behavior in Li6PS5Br.
ISSN:1948-7185
1948-7185
DOI:10.1021/jz401003a