Chemical and electrochemical Li-insertion into the Li4Ti 5O12 spinel

L. Aldon, P. Kubiak, M. Womes, J. C. Jumas, J. Olivier-Fourcade, J. L. Tirado, J. I. Corredor, C. Pérez Vicente

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Lithium has been inserted into the spinel Li4Ti 5O12 by both chemical and electrochemical methods. The cation distribution in the lithiated phases has been analyzed by 6,7Li NMR, Raman spectroscopy, and X-ray diffraction, and the distribution in the chemically inserted compound has been analyzed additionally by neutron diffraction. A refinement of structural parameters has been carried out by applying the Rietveld method to the neutron diffraction pattern. It is shown that the two insertion methods are based on different mechanisms. Chemically inserted lithium ions are trapped in the (48f) sites of the spinel structure from which they cannot be extracted by electrochemical means. In contrast to the electrochemical Li-insertion, which is accompanied by a spinel to rocksalt phase transition, no such structural change is found for chemical insertion. The consequences of the two different mechanisms for the reversibility of the insertion process are discussed.

Original languageEnglish
Pages (from-to)5721-5725
Number of pages5
JournalChemistry of Materials
Issue number26
Publication statusPublished - 28 Dec 2004


ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

Aldon, L., Kubiak, P., Womes, M., Jumas, J. C., Olivier-Fourcade, J., Tirado, J. L., Corredor, J. I., & Pérez Vicente, C. (2004). Chemical and electrochemical Li-insertion into the Li4Ti 5O12 spinel. Chemistry of Materials, 16(26), 5721-5725.