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  • Evidence of Enhanced Ion Transport in Li-Rich Silicate Intercalation Materials

    Rights statement: This is the peer reviewed version of the following article:J. Billaud, C. Eames, N. Tapia-Ruiz, M. R. Roberts, A. J. Naylor, A. R. Armstrong, M. S. Islam, P. G. Bruce, Adv. Energy Mater. 2017, 7, 1601043 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/aenm.201601043/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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Evidence of enhanced ion transport in Li-rich silicate intercalation materials

Research output: Contribution to journalJournal articlepeer-review

Published
  • Juliette Billaud
  • Christopher Eames
  • Nuria Tapia Ruiz
  • Matthew R. Roberts
  • Andrew J. Naylor
  • A. Robert Armstrong
  • M. Saiful Islam
  • Peter G. Bruce
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Article number1601043
<mark>Journal publication date</mark>7/06/2017
<mark>Journal</mark>Advanced Energy Materials
Issue number11
Volume7
Number of pages9
Publication StatusPublished
Early online date17/01/17
<mark>Original language</mark>English

Abstract

The silicate compounds Li2MSiO4 (where M = Mn, Fe, Co) have received significant attention recently as Li intercalation electrodes. Overwhelmingly they exhibit relatively poor kinetics of ion intercalation. By synthesizing Li-rich solid solutions of the form Li2+2xFe1−xSiO4 (with 0 ≤ x ≤ 0.3), the structural requirements for fast ion transport and hence relatively fast intercalation have been identified. Specifically the presence of additional Li+ in interstitial sites, not normally occupied in the stoichiometric Li2FeSiO4 compound, enhances ion transport by more than two orders of magnitude. The results, obtained by combining electrochemical measurements, with powder X-ray and neutron diffraction and atomistic modeling of the ion dynamics, provide valuable guidance in designing future intercalation electrodes with high Li-ion transport and, hence, fast electrode kinetics.

Bibliographic note

This is the peer reviewed version of the following article:J. Billaud, C. Eames, N. Tapia-Ruiz, M. R. Roberts, A. J. Naylor, A. R. Armstrong, M. S. Islam, P. G. Bruce, Adv. Energy Mater. 2017, 7, 1601043 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/aenm.201601043/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.