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Nuclear magnetic resonance (NMR) is a powerful technique for measuring atomic diffusion in lithium-ion conductors such as solid electrolytes and active materials. Since ion and electron fluxes inside the battery are governed by ion diffusion, the determination of the diffusion coefficient is essential. This section describes a method for determining the diffusion coefficient of a solid elec-trolyte using mainly pulsed field gradient (PFG) NMR. The diffusion coefficient of a perovskite solid electrolyte (Li0.29La0.57TiO3; LLTO) was determined. Tracer diffu-sion coefficient measured by isotope exchange and secondary ion mass spectrometry (SIMS) and conductivity diffusion coefficient measured by impedance spectroscopy were also applied for LLTO. PFG-NMR studies have revealed anisotropic diffusion of LLTO due to the two-dimensional crystal structure. SIMS studies show that grain boundary diffusion of LLTO is 10,000 times slower than bulk diffusion. The Haven ratio was shown to be 0.24 at the grain boundary compared to 1 in the bulk.

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• In Copyright
  

Keyword: Diffusivity, solid electrolyte, anisotropy, grain boundary, Haven ratio, non-Arrhenius behavior

Date published: 2024-10-15

Publisher: Springer, Singapore

Journal:

• Interface Ionics For All-Solid-State Batteries and Solid State Ionics Devices p. 273-284

Funding:

• JSPS KAKENHI JP19H05814 (Grant-in-Aid for Scientific Research on Innovative Areas “Interface IONICS”)
• JSPS KAKENHI JP21H02033 (Grant-in-Aid for Scientific Research (B))

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5090

First published URL: https://doi.org/10.1007/978-981-97-6039-8_24

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Updated at: 2025-10-21 15:51:01 +0900

Published on MDR: 2025-10-21 15:43:35 +0900