Lithium-Ion Mobility in Layered Oxide Li2(La0.75Li0.25)(Ta1.5Ti0.5)O7 Containing Lithium on both Intra and Inter‐Stack Positions

Fanah, Selorm Joy; Ramezanipour, Farshid

doi:10.1002/ejic.202100950

Title: Lithium-Ion Mobility in Layered Oxide Li₂(La_0.75Li_0.25)(Ta_1.5Ti_0.5)O₇ Containing Lithium on both Intra and Inter‐Stack Positions

Journal Article · 03 February 2022 · European Journal of Inorganic Chemistry

DOI: https://doi.org/10.1002/ejic.202100950 · OSTI ID:1981409

Fanah, Selorm Joy ^[1];

^[1]

University of Louisville, KY (United States)

With the aid of neutron diffraction and electrochemical impedance spectroscopy, we have demonstrated the effect of the increase in lithium concentration and distribution on Li-ion conductivity. This has been done through the synthesis of a layered oxide Li₂(La_0.75Li_0.25)(Ta_1.5Ti_0.5)O₇, with the so-called Ruddlesden-Popper type structure, where bilayer stacks of (Ta/Ti)O₆ octahedra are separated by lithium ions, located in inter-stack spaces. There are also intra-stack spaces that are occupied by a mixture of La and Li, as confirmed by neutron diffraction. The distribution of lithium over both inter- and intra-stack positions leads to the enhancement of Li-ion conductivity in Li₂(La_0.75Li_0.25)(Ta_1.5Ti_0.5)O₇ compared to Li₂La(TaTi)O₇, which has a lower concentration of lithium ions, located only in inter-stack spaces. Furthermore, the analyses of real and imaginary components of electrochemical impedance data confirm the enhanced mobility of ions in Li₂(La_0.75Li_0.25)(Ta_1.5Ti_0.5)O₇. While the Li-ion conductivity needs further improvement for practical applications, the success of the strategy implemented in this work offers a useful methodology for the design of layered ionic conductors.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1981409

Journal Information:: European Journal of Inorganic Chemistry, Journal Name: European Journal of Inorganic Chemistry Journal Issue: 7 Vol. 2022; ISSN 1434-1948

Publisher:: ChemPubSoc EuropeCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Lithium-Ion Mobility in Layered Oxide Li2(La0.75Li0.25)(Ta1.5Ti0.5)O7 Containing Lithium on both Intra and Inter‐Stack Positions

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Title: Lithium-Ion Mobility in Layered Oxide Li₂(La_0.75Li_0.25)(Ta_1.5Ti_0.5)O₇ Containing Lithium on both Intra and Inter‐Stack Positions