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- W2577256123 abstract "La(1-x)/3LixNbO3 (LLNbO) is a promising electrolyte material for solid-state lithium-ion batteries because it is stable in contact with Li metal and contains a high concentration of intrinsic Li-ion vacancies. One strategy for improving its ionic conductivity and making it more competitive with other solid-state Li-ion electrolytes is to disorder the Li-ion vacancies by appropriate post-synthesis heat treatment, e.g., annealing. In this study, we examine the effects of annealing on single crystals of LLNbO with Li contents x = 0.07 and 0.13 based on simultaneous atomic resolution high angle annular dark field and annular bright field imaging methods using state-of-the-art aberration corrected scanning transmission electron microscopes. It is found that La modulation within A1 layers of the cation-deficient layered perovskite structure becomes more diffuse after annealing. In addition, some La atoms move to A-site positions and O4 window positions in the nominally vacant A2 layer, while O atom columns in this layer become rumpled in the [001]p direction, indicating that the NbO6 octahedra are more heavily distorted after annealing. The observed crystal structure differences between as-prepared and annealed single crystals explain the drop in Li-ion conductivities of LLNbO single crystals after heat treatment." @default.
- W2577256123 created "2017-01-26" @default.
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- W2577256123 date "2017-04-01" @default.
- W2577256123 modified "2023-10-15" @default.
- W2577256123 title "Atomic scale imaging of structural changes in solid electrolyte lanthanum lithium niobate upon annealing" @default.
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- W2577256123 doi "https://doi.org/10.1016/j.actamat.2017.01.028" @default.
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