jp9b06055_si_006.cif (18.83 kB)
Download fileNew Amorphous Iron-Based Oxyfluorides as Cathode Materials for High-Capacity Lithium-Ion Batteries
dataset
posted on 2019-08-21, 18:17 authored by Kévin Lemoine, Leiting Zhang, Jean-Marc Grenèche, Annie Hémon-Ribaud, Marc Leblanc, Amandine Guiet, Cyrille Galven, Jean-Marie Tarascon, Vincent Maisonneuve, Jérôme LhosteA novel
two-step strategy to prepare amorphous oxyfluorides, containing
both divalent and trivalent 3d-metals, as cathode materials for lithium
batteries is presented. The first step involves the preparation of
hydrated fluorides M2+M3+2F8(H2O)2 (M2+ = Mn, Fe, Co, Ni, Cu;
M3+ = V, Fe) by microwave-assisted solvothermal synthesis.
Besides the MnFe2F8(H2O)2 and CuFe2F8(H2O)2 phases,
three new compounds, Fe1.3V1.7F8(H2O)2, CoFe2F8(H2O)2, and NiFe2F8(H2O)2, which are isostructural with Fe3F8(H2O)2, have been unraveled. The second step
consists in the decomposition of M2+M3+2F8(H2O)2 into amorphous oxyfluorides
M2+M3+2F8–2xOx via suitable thermal treatments.. The amorphous materials show a greater electrochemical activity
toward Li than their parent phases, among them being CuFe2F6O, which displays the best performance as a cathode
material with a first discharge capacity of 310 mAh·g–1. We show that such a large capacity results from cumulative insertion
and displacement reactions.
History
Usage metrics
Read the peer-reviewed publication
Categories
Keywords
Fe 1.3 V 1.7 F 8High-Capacity Lithium-Ion BatteriesNiFe 2 F 8oxyfluorideCathode MaterialsNew Amorphous Iron-Based Oxyfluoridesmaterials showCuFe 2 F 8parent phasescathode materialsCuFe 2 F 6 Oelectrochemical activitytrivalent 3 d-metalslithium batteriesH 2 Ocapacity resultsFe 3 F 8displacement reactionsmicrowave-assisted solvothermal synthesisMnFe 2 F 8cathode materialdischarge capacity2 phasesCoFe 2 F 8
CC BY-NC 4.0