4.8 Article

In-Channel and In-Plane Li Ion Diffusions in the Superionic Conductor Li10GeP2S12 Probed by Solid-State NMR

Journal

CHEMISTRY OF MATERIALS
Volume 27, Issue 16, Pages 5503-5510

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b01384

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Funding

  1. National Natural Science Foundation of China [11474314, 11004220, 11274347, 21221064]

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Li10GeP2S12 (LGPS) is a new solid electrolyte of the highest Li ionic conductivity reported as of now. An anisotropic 3D Li ionic transport network consisting of an ultrafast Li 1D diffusion tunnel and fast in-plane 2D pathways was previously predicted by molecular dynamics simulations. In this paper, we have studied in detail the Li ion dynamics in LGPS by multiple solid-state NMR methods. Two different Li motion processes, characterized by apparently different activation energies of 0.16 eV and 0.26 eV, were unambiguously probed by both Li-7 and P-31 solid-state NMR and assigned to Li ion diffusions in the 1D tunnel and in the 2D plane, respectively. P-31 spin-locking relaxation measurement further reveals that interstitial position Li(4) is active for in-plane Li migration.

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