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

Billaud, Juliette and Eames, Christopher and Tapia Ruiz, Nuria and Roberts, Matthew R. and Naylor, Andrew J. and Armstrong, A. Robert and Islam, M. Saiful and Bruce, Peter G. (2017) Evidence of enhanced ion transport in Li-rich silicate intercalation materials. Advanced Energy Materials, 7 (11).

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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.

Item Type:
Journal Article
Journal or Publication Title:
Advanced Energy Materials
Additional Information:
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.
ID Code:
84179
Deposited By:
Deposited On:
23 Jan 2017 14:08
Refereed?:
Yes
Published?:
Published
Last Modified:
28 Mar 2020 04:46