Atomistic Origin of Li-Ion Conductivity Reduction at (Li3xLa2/3–x)TiO3 Grain Boundary
| Autor: | Gabriel Sánchez-Santolino, Naoya Shibata, Hiromichi Ohta, Yuichi Ikuhara, Ryo Ishikawa, Shun Sasano |
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| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Materials science Mechanical Engineering chemistry.chemical_element Bioengineering General Chemistry Electrolyte Conductivity Condensed Matter Physics Oxygen Ion chemistry Chemical physics Scanning transmission electron microscopy General Materials Science Grain boundary Lithium |
| Zdroj: | Nano Letters. 21:6282-6288 |
| ISSN: | 1530-6992 1530-6984 |
| Popis: | Lithium lanthanum titanate (LLTO) is one of the excellent candidates for an electrolyte in the all-solid-state Li-ion battery, owing to the high Li-ion conductivity in the bulk. However, the Li-ion conductivity at the grain boundary (GB) is largely reduced, and it is therefore important to reveal the origin of Li-ion conductivity reduction at the GB. Here, by using atomic-resolution scanning transmission electron microscopy combined with atomic force microscopy, we investigate the charge states, Li-ion conductivities, atomic and electronic structures at the LLTO Σ5 and Σ13 GBs. Although the Σ5 GB has no significant influence on Li-ion conductivity, the Σ13 GB shows the evident reduction of Li-ion conductivity. We further elucidate that the Σ13 GB is positively charged by the formation of oxygen vacancies at the GB. Such a positive charge would form the Li-ion depletion layers adjacent to the GB, which causes the significant reduction of Li-ion conductivity. |
| Databáze: | OpenAIRE |
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