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 journalArticlepeer-review

48 Citations (Scopus)

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 languageEnglish
Pages (from-to)4741-4744
Number of pages4
JournalJournal of Physical Chemistry C
Volume113
Issue number12
DOIs
Publication statusPublished - 26 Mar 2009

Keywords

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

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