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- Title
Evidence of Enhanced Ion Transport in Li-Rich Silicate Intercalation Materials.
- Authors
Billaud, Juliette; Eames, Christopher; Tapia‐Ruiz, Nuria; Roberts, Matthew R.; Naylor, Andrew J.; Armstrong, A. Robert; Islam, M. Saiful; Bruce, Peter G.
- 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.
- Subjects
SILICATES; CHEMICAL kinetics; LITHIUM; ELECTRODES; NEUTRON diffraction
- Publication
Advanced Energy Materials, 2017, Vol 7, Issue 11, pn/a
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201601043