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Evidence of Enhanced Ion Transport in Li‐Rich Silicate Intercalation Materials
Author(s) -
Billaud Juliette,
Eames Christopher,
TapiaRuiz Nuria,
Roberts Matthew R.,
Naylor Andrew J.,
Armstrong A. Robert,
Islam M. Saiful,
Bruce Peter G.
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201601043
Subject(s) - intercalation (chemistry) , materials science , ion , silicate , kinetics , electrochemistry , neutron diffraction , electrode , ion transporter , stoichiometry , inorganic chemistry , analytical chemistry (journal) , chemical engineering , crystallography , chemistry , crystal structure , organic chemistry , engineering , physics , quantum mechanics
The silicate compounds Li 2 MSiO 4 (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 Li 2+2 x Fe 1− x SiO 4 (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 Li 2 FeSiO 4 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.