In-Channel and In-Plane Li Ion Diffusions in the Superionic Conductor Li10GeP2S12 Probed by Solid-State NMR
In-Channel and In-Plane Li Ion Diffusions in the Superionic Conductor Li10GeP2S12 Probed by Solid-State NMR
复制标题
固态核磁共振探测超离子导体 Li10GeP2S12 中的通道内和面内锂离子扩散
DOI：
10.1021/acs.chemmater.5b01384
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发表时间：
2015-08-25
影响因子：
8.6
通讯作者：
Feng, Jiwen
中科院分区：
文献类型：
--
作者：
Liang, Xinmiao;Wang, Liying;Feng, Jiwen
Li10GeP2S12(LGPS)是目前报道的锂离子电导率最高的新型固体电解质。分子动力学模拟预测了一个由超快Li1D扩散隧道和快速面内2D路径组成的各向异性3DLi离子输运网络。本文用多种固体核磁共振方法详细研究了LGPS中锂离子的动力学。7Li和31P固体核磁共振都明确地探测了两个不同的Li运动过程，它们的活化能分别为0.16 eV和0.26 eV，并分别归属于一维隧道和2D平面中的Li离子扩散。31P自旋锁定弛豫测量进一步揭示了间隙位置Li(4)对面内Li的迁移是活跃的。
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 7Li and 31P solid-state NMR and assigned to Li ion diffusions in the 1D tunnel and in the 2D plane, respectively. 31P spin-locking relaxation measurement further reveals that interstitial position Li(4) is active for in-plane Li migration.