Experimental background for Li-rich silicates

Name: Experimental background for Li-rich silicates
Published: 2016-01-01T00:00:00Z
License: https://ora.ox.ac.uk/terms_of_use

Documentation:: Data was created as a result of work undertaken in Peter Bruce's laboratories between 2014 and 2016.

Files:: Experimental background for Li-rich silicates.docx

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Related item:: Evidence of Enhanced Ion Transport in Li-rich Silicate Intercalation Materials
Description:: 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), we have identified the structural requirements for fast ion transport and hence relatively fast intercalation. 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 electro-chemical 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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