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Enhancement in ionic conductivity of Dysprosium doped Li7La3Zr2O12 solid electrolyte applied in Li-ion batteries

Salimkhani, Hamed (2020) Enhancement in ionic conductivity of Dysprosium doped Li7La3Zr2O12 solid electrolyte applied in Li-ion batteries. [Thesis]

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Official URL: https://risc01.sabanciuniv.edu/record=b2486479_(Table of contents)

Abstract

In this investigation, a novel Li-stuffed garnet type solid electrolyte with enhanced properties was fabricated. For this purpose, different concentrations of Dy ranging from 0.1 to o.8 atoms per formula unit (pfu) were doped into the Li7La3Zr2O12 to stabilize the cubic structure and, therefore, tailor the ionic conductivity. Furthermore, fundamental studies were performed through X-ray diffraction and Rietveld refinement to develop crystal structure of the Dy doped LLZO and determine the site preference of Dy. On another attempt in this study, Density Functional (DFT) total energy computations were applied to investigate the convergence of Dy at different Wyckoff sites energetically and to further validate the results of experiments. Additionally, 7 Li and 6 Li solidstate MAS NMR was performed to reveal the chemical coordination of Li at different sites. The results of this thesis project indicated that Dy ions probably substitute for Zr site and Li ions prefer tetrahedral (24d) and octahedral (48g) atomic sites. Additionally, our novel solid electrolyte demonstrated the highest ionic conductivity (2.03×10-3 S.cm-1 ) reported for LLZOs.

Item Type:Thesis
Uncontrolled Keywords:LLZO. -- Dysprosium. -- Dopant. -- XRD. -- Ionic conductivity. -- Solid-state MAS NMR. -- LLZO. -- Disprozyum. -- Katkılama. -- XIK. -- iyonik iletkenlik. -- Katı Hal MAS NMR.
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
ID Code:41233
Deposited By:IC-Cataloging
Deposited On:09 Nov 2020 15:57
Last Modified:21 Mar 2021 00:01

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