Lithium insertion into the spinel LiFe5O8 |
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| Affiliation: | 1. School of Chemical Engineering, University of Ulsan, Ulsan 680-749, Republic of Korea;2. College of Chemistry, Chemical Engineering and Food Safety, Bohai University, 19 Sci-tech Road, Jinzhou 121013, PR China;1. College of Physics, University-Industry Joint Center for Ocean Observation and Broadband Communication, Qingdao University, Qingdao 266071, China;2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;3. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;4. Department of Electrical and Computer Engineering & Institute for Quantum Computing, University of Waterloo, Waterloo, ON N2L 3G1, Canada |
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| Abstract: | Lithium has been inserted into the spinel LiFe5O8 at both ambient and high temperature. At 50 °C two lithium ions per formula unit can be inserted into the structure; the inserted lithium ions displace the tetrahedral ferric ions of the spinel into neighbouring vacant octahedral sites to yield a rocksalt phase Li3Fe5O8. The long-range order of the lithium and iron ions on the B-sites of the Atet[B2]octX4 spinel (Fe[Li0.5Fe1.5]O4) is not affected by lithiation. At 400 °C electrochemical insertion of lithium is accompanied by iron extrusion from the oxide lattice. The reaction of two lithium ions per LiFe5O8 at this temperature results in a product consisting predominantly of a rocksalt phase of composition Li2Fe3O5 in which the lithium and iron ions are randomly distributed over all the octahedral sites of the structure, and metallic iron. |
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