期刊
ADVANCED ENERGY MATERIALS
卷 7, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201601043
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资金
- EPSRC Supergen Energy Storage Consortium [EP/L019469/1]
- Energy Materials Programme Grant [EP/K016288]
- Engineering and Physical Sciences Research Council [EP/L019469/1, EP/I029273/2, 1589704, EP/I029273/1, EP/M009521/1, EP/K016288/1] Funding Source: researchfish
- EPSRC [EP/I029273/1, EP/K016288/1, EP/I029273/2, EP/L019469/1, EP/M009521/1] Funding Source: UKRI
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.
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