The Lithium Extraction/Insertion Mechanism in Li2FeSiO4
2006 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 16, 2266-2272 p.Article in journal (Refereed) Published
The lithium extraction and insertion mechanism in the cathode material Li2FeSiO4 has been monitored by in situ X-ray diffraction and Mössbauer spectroscopy during the first two cycles. The residual amounts of Li2FeSiO4 and LiFeSiO4 in the fully charged and discharged states are 5% and 10%, respectively, on the basis of both Mössbauer spectroscopy and powder XRD studies; this is also in good agreement with the results of electrochemical measurements. The observed lowering of the potential plateau from 3.10 to 2.80 V during the first cycle can be explained by a structural rearrangement in which some of the Li ions (in the 4b site) and Fe ions (in the 2a site) become interchanged.
Place, publisher, year, edition, pages
2006. Vol. 16, 2266-2272 p.
IdentifiersURN: urn:nbn:se:uu:diva-93796DOI: 10.1039/B601184EOAI: oai:DiVA.org:uu-93796DiVA: diva2:167387