Li+ and F- ion dynamics in the dispersed ionic conductor LiF:TiO2

Katharina Hogrefe; Maria Gombotz; Kevin Patrick Pree; Ilie Hanzu; Bernhard Gadermaier; H. Martin R. Wilkening

Li⁺ and F^- ion dynamics in the dispersed ionic conductor LiF:TiO₂

Katharina Hogrefe, Maria Gombotz, Kevin Patrick Pree, Ilie Hanzu, Bernhard Gadermaier, H. Martin R. Wilkening

Institut für Chemische Technologie von Materialien (6380)

Publikation: Konferenzbeitrag › Poster

Abstract

Lithium fluoride, known to be a very poor ionic conductor, was chosen as a model substance to investigate the influence of the insulator TiO2 on ion dynamics in LiF. In general, in such two-phase systems percolating Li pathways at the conductor | insulator interface may lead to enhanced ion dynamics. Indeed, we observed such an effect which we investigated by impedance spectroscopy and Nuclear Magnetic Resonance (NMR). Compared to nanocrystalline LiF, an increase in (total) conductivity of nearly four orders of magnitude, that is, from 6 · 10-11 S cm-1 up to 2 · 10-7 S cm-1 (100°C) was observed by adding 40vol% TiO2. As both ions in LiF, Li and F, are mobile, NMR helped reveal Li+ as the mainly responsible ion for this increase. Compared to SiO2 and Al2O3 [1], TiO2 revealed the largest increase in conductivity making it highly suitable to effectively engineer the interfacial regions in such conductor|insulator systems.

[1] S. Breuer, V. Pregartner, S. Lunghammer and H. M. R. Wilkening, J. Phys. Chem. C 2019, 123, 9, 5222–5230

Originalsprache	englisch
Publikationsstatus	Veröffentlicht - 15 Sept. 2021
Veranstaltung	2021 European Congress and Exhibition on Advanced Materials and Processes: EUROMAT 2021 - Virtuell, Virtuell, Österreich Dauer: 13 Sept. 2021 → 17 Sept. 2021 https://www.euromat2021.org/

Konferenz

Konferenz	2021 European Congress and Exhibition on Advanced Materials and Processes
Kurztitel	EUROMAT 2021
Land/Gebiet	Österreich
Ort	Virtuell
Zeitraum	13/09/21 → 17/09/21
Internetadresse	https://www.euromat2021.org/

Dieses zitieren

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title = "Li+ and F- ion dynamics in the dispersed ionic conductor LiF:TiO2",

abstract = "Lithium fluoride, known to be a very poor ionic conductor, was chosen as a model substance to investigate the influence of the insulator TiO2 on ion dynamics in LiF. In general, in such two-phase systems percolating Li pathways at the conductor | insulator interface may lead to enhanced ion dynamics. Indeed, we observed such an effect which we investigated by impedance spectroscopy and Nuclear Magnetic Resonance (NMR). Compared to nanocrystalline LiF, an increase in (total) conductivity of nearly four orders of magnitude, that is, from 6 · 10-11 S cm-1 up to 2 · 10-7 S cm-1 (100°C) was observed by adding 40vol% TiO2. As both ions in LiF, Li and F, are mobile, NMR helped reveal Li+ as the mainly responsible ion for this increase. Compared to SiO2 and Al2O3 [1], TiO2 revealed the largest increase in conductivity making it highly suitable to effectively engineer the interfacial regions in such conductor|insulator systems.[1] S. Breuer, V. Pregartner, S. Lunghammer and H. M. R. Wilkening, J. Phys. Chem. C 2019, 123, 9, 5222–5230",

author = "Katharina Hogrefe and Maria Gombotz and Pree, {Kevin Patrick} and Ilie Hanzu and Bernhard Gadermaier and Wilkening, {H. Martin R.}",

year = "2021",

month = sep,

day = "15",

language = "English",

note = "2021 European Congress and Exhibition on Advanced Materials and Processes : EUROMAT 2021, EUROMAT 2021 ; Conference date: 13-09-2021 Through 17-09-2021",

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TY - CONF

T1 - Li+ and F- ion dynamics in the dispersed ionic conductor LiF:TiO2

AU - Hogrefe, Katharina

AU - Gombotz, Maria

AU - Pree, Kevin Patrick

AU - Hanzu, Ilie

AU - Gadermaier, Bernhard

AU - Wilkening, H. Martin R.

PY - 2021/9/15

Y1 - 2021/9/15

N2 - Lithium fluoride, known to be a very poor ionic conductor, was chosen as a model substance to investigate the influence of the insulator TiO2 on ion dynamics in LiF. In general, in such two-phase systems percolating Li pathways at the conductor | insulator interface may lead to enhanced ion dynamics. Indeed, we observed such an effect which we investigated by impedance spectroscopy and Nuclear Magnetic Resonance (NMR). Compared to nanocrystalline LiF, an increase in (total) conductivity of nearly four orders of magnitude, that is, from 6 · 10-11 S cm-1 up to 2 · 10-7 S cm-1 (100°C) was observed by adding 40vol% TiO2. As both ions in LiF, Li and F, are mobile, NMR helped reveal Li+ as the mainly responsible ion for this increase. Compared to SiO2 and Al2O3 [1], TiO2 revealed the largest increase in conductivity making it highly suitable to effectively engineer the interfacial regions in such conductor|insulator systems.[1] S. Breuer, V. Pregartner, S. Lunghammer and H. M. R. Wilkening, J. Phys. Chem. C 2019, 123, 9, 5222–5230

AB - Lithium fluoride, known to be a very poor ionic conductor, was chosen as a model substance to investigate the influence of the insulator TiO2 on ion dynamics in LiF. In general, in such two-phase systems percolating Li pathways at the conductor | insulator interface may lead to enhanced ion dynamics. Indeed, we observed such an effect which we investigated by impedance spectroscopy and Nuclear Magnetic Resonance (NMR). Compared to nanocrystalline LiF, an increase in (total) conductivity of nearly four orders of magnitude, that is, from 6 · 10-11 S cm-1 up to 2 · 10-7 S cm-1 (100°C) was observed by adding 40vol% TiO2. As both ions in LiF, Li and F, are mobile, NMR helped reveal Li+ as the mainly responsible ion for this increase. Compared to SiO2 and Al2O3 [1], TiO2 revealed the largest increase in conductivity making it highly suitable to effectively engineer the interfacial regions in such conductor|insulator systems.[1] S. Breuer, V. Pregartner, S. Lunghammer and H. M. R. Wilkening, J. Phys. Chem. C 2019, 123, 9, 5222–5230

M3 - Poster

T2 - 2021 European Congress and Exhibition on Advanced Materials and Processes

Y2 - 13 September 2021 through 17 September 2021

ER -