Lesson Learned from NMR: Characterization and Ionic Conductivity of LGPS-like Li7SiPS8
| Autor: | Constantin Hoch, Sascha Harm, Roland Eger, Alexander Kuhn, Anna-Katharina Hatz, Bettina V. Lotsch, Igor L. Moudrakovski |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Analytical chemistry 02 engineering and technology General Chemistry Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Amorphous solid Dielectric spectroscopy Tetragonal crystal system Phase (matter) Materials Chemistry Fast ion conductor Ionic conductivity 0210 nano-technology Pulsed field gradient |
| Zdroj: | Chemistry of Materials. 31:1280-1288 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.8b04051 |
| Popis: | We report on the facile solid-state synthesis and characterization of Li7SiPS8, a new member of the tetragonal Li10GeP2S12 (LGPS)-type family of ultrafast Li+ solid electrolytes. We analyze the structure, phase stability, and Li+ conductivity of tetragonal and orthorhombic LSiPS by pulsed field gradient NMR and impedance spectroscopy, which show conductivities at room temperature of up to 2 mS cm–1. Although ranking tetragonal LiSiPS as an ultrafast solid electrolyte, the observed conductivity is unexpectedly low compared to other members of this solid-solution system. Utilizing solid-state NMR, quantitative phase analysis, and impedance spectroscopy, we identify an amorphous thiophosphate side phase with low Si content, which limits the intergrain conductivity and, hence, a potentially higher total conductivity. This case study thus highlights the need for comprehensive structural analysis of LGPS-type materials beyond the crystalline fractions to fully characterize the structure–property relationships i... |
| Databáze: | OpenAIRE |
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