Diffusion in Confined Dimensions: Li+ Transport in Mixed Conducting TiO2-B Nanowires

Martin Wilkening; Christopher Lyness; A. Robert Armstrong; Peter George Bruce

doi:10.1021/jp8107792

Diffusion in Confined Dimensions: Li+ Transport in Mixed Conducting TiO2-B Nanowires

Martin Wilkening, Christopher Lyness, A. Robert Armstrong, Peter George Bruce

Research output: Contribution to journal › Article › peer-review

Abstract

The precise determination of diffusion parameters plays a key role in Li battery research and is a rather complex problem when electrode materials, i.e., mixed conductors, have to be investigated. In the present contribution, we show how stimulated echo nuclear magnetic resonance (NMR) can be used to go beyond the limits of standard NMR methods for the characterization of dynamic properties of one of the most promising new electrode materials viz. Li intercalated TiO2-B nanowires. It turned out that Li self-diffusion is very slow with an activation energy of 0.48(1) eV. Obviously, the shorter diffusion length compensates for this low mobility so that, nonetheless, facile incorporation and removal of Li is possible when the nanowires are used in an ion battery.

Original language	English
Pages (from-to)	4741-4744
Number of pages	4
Journal	Journal of Physical Chemistry C
Volume	113
Issue number	12
DOIs	https://doi.org/10.1021/jp8107792
Publication status	Published - 26 Mar 2009

Keywords

NUCLEAR-MAGNETIC-RESONANCE
ECHO NMR-SPECTROSCOPY
LITHIUM DYNAMICS
SPIN-ALIGNMENT
LI-7 NMR
SOLIDS
BATTERIES
EXCHANGE

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abstract = "The precise determination of diffusion parameters plays a key role in Li battery research and is a rather complex problem when electrode materials, i.e., mixed conductors, have to be investigated. In the present contribution, we show how stimulated echo nuclear magnetic resonance (NMR) can be used to go beyond the limits of standard NMR methods for the characterization of dynamic properties of one of the most promising new electrode materials viz. Li intercalated TiO2-B nanowires. It turned out that Li self-diffusion is very slow with an activation energy of 0.48(1) eV. Obviously, the shorter diffusion length compensates for this low mobility so that, nonetheless, facile incorporation and removal of Li is possible when the nanowires are used in an ion battery.",

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AU - Wilkening, Martin

AU - Lyness, Christopher

AU - Armstrong, A. Robert

AU - Bruce, Peter George

PY - 2009/3/26

Y1 - 2009/3/26

N2 - The precise determination of diffusion parameters plays a key role in Li battery research and is a rather complex problem when electrode materials, i.e., mixed conductors, have to be investigated. In the present contribution, we show how stimulated echo nuclear magnetic resonance (NMR) can be used to go beyond the limits of standard NMR methods for the characterization of dynamic properties of one of the most promising new electrode materials viz. Li intercalated TiO2-B nanowires. It turned out that Li self-diffusion is very slow with an activation energy of 0.48(1) eV. Obviously, the shorter diffusion length compensates for this low mobility so that, nonetheless, facile incorporation and removal of Li is possible when the nanowires are used in an ion battery.

AB - The precise determination of diffusion parameters plays a key role in Li battery research and is a rather complex problem when electrode materials, i.e., mixed conductors, have to be investigated. In the present contribution, we show how stimulated echo nuclear magnetic resonance (NMR) can be used to go beyond the limits of standard NMR methods for the characterization of dynamic properties of one of the most promising new electrode materials viz. Li intercalated TiO2-B nanowires. It turned out that Li self-diffusion is very slow with an activation energy of 0.48(1) eV. Obviously, the shorter diffusion length compensates for this low mobility so that, nonetheless, facile incorporation and removal of Li is possible when the nanowires are used in an ion battery.

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KW - ECHO NMR-SPECTROSCOPY

KW - LITHIUM DYNAMICS

KW - SPIN-ALIGNMENT

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KW - SOLIDS

KW - BATTERIES

KW - EXCHANGE

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JO - Journal of Physical Chemistry C

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Diffusion in Confined Dimensions: Li+ Transport in Mixed Conducting TiO2-B Nanowires

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Keywords

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