Evidence of enhanced ion transport in Li-rich silicate intercalation materials
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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.
Billaud , J , Eames , C , Tapia-Ruiz , N , Roberts , M R , Naylor , A J , Armstrong , A R , Islam , M S & Bruce , P G 2017 , ' Evidence of enhanced ion transport in Li-rich silicate intercalation materials ' Advanced Energy Materials , vol 7 , no. 11 , 1601043 . DOI: 10.1002/aenm.201601043
Advanced Energy Materials
© 2017 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Financial support from the EPSRC Supergen Energy Storage Consortium (EP/L019469/1) and the Energy Materials Programme Grant (EP/K016288) is gratefully acknowledged
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