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

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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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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.
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Original languageEnglish
Article number1601043
Number of pages9
JournalAdvanced Energy Materials
Volume7
Issue number11
Early online date17 Jan 2017
DOIs
StatePublished - 7 Jun 2017

    Research areas

  • Interstitial lithium, Lithium iron silicate, li2+2xFe1-xSiO4

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