Direct Assessment of Ultralow Li+ Jump Rates in Single Crystalline Li3N by Evolution-Time-Resolved 7Li Spin-Alignment Echo NMR

Bernhard Gadermaier, Katharina Hogrefe, Paul Heitjans, H. Martin R. Wilkening*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Diffusion processes of small cations and anions play important roles in many applications such as batteries and sensors. Despite the enormous progress we have witnessed over the past years in characterizing the irregular movement of ions such as Li+, new methods able to sharpen our view and understanding of fast and slow diffusion phenomena are steadily developed. Still, very few techniques are, however, available to directly sense extremely slow Li+ diffusion processes. Here, we took advantage of 1D evolution-time resolved 7Li spin-alignment echo NMR that is able to probe the extremely slow interlayer Li+ hopping process in layer-structured Li3N, which served as a model substance for our purposes. The use of single crystals enabled us to study this translational process without being interfered by the fast intralayer Li+ motions. At 318 K the corresponding jump rate of interlayer dynamics turned out to be in the order of 2500(200) s−1 resulting in a diffusion coefficient as low as 1×10−17 m2 s−1, which is in excellent agreement with results from literature. The method, comparable to 1D and 2D NMR exchange spectroscopy, relies on temporal fluctuations of electric interactions the jumping ions are subjected to. 7Li single crystal 1D SAE NMR offers new opportunities to precisely quantify slow Li+ diffusion processes needed to validate theoretical models and to develop design principles for new solid electrolytes.

Original languageEnglish
Pages (from-to)1028-1033
Number of pages6
JournalEuropean Journal of Inorganic Chemistry
Volume2021
Issue number11
DOIs
Publication statusPublished - 19 Mar 2021

Keywords

  • Diffusion
  • Electrochemistry
  • Lithium
  • Solid electrolytes
  • Spin-alignment echoes

ASJC Scopus subject areas

  • Inorganic Chemistry

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