4.3 Article

Solvothermal synthesis of electroactive lithium iron tavorites and structure of Li2FePO4F

Journal

JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 11, Pages 4759-4766

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm15273h

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Funding

  1. NSERC through Canada Research Chair
  2. FQRNT (Fonds Quebecois de la Recherche sur la Nature et les Technologies)
  3. NSERC

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Lithium transition metal fluorophosphates with a tavorite structure have been recognized as promising electrode materials for lithium-ion batteries because of their good energy storage capacity combined with electrochemical and thermal stability. We report here a new low-cost and environmentally friendly solvothermal process to prepare LiFePO4F, which exhibits a complex single phase regime followed by a two-phase plateau at 2.75 V on electrochemical lithium insertion. The structure of the pure single phase end member Li2FePO4F was synthesized by lithiation of LiFePO4F, and solved via Rietveld refinement of the combined X-ray and neutron diffraction patterns, showing that Li+ occupies multiple sites in the tavorite lattice. LiFePO4OH was prepared by a new synthetic route and the electrochemical capacity for this material is the highest reported to date. LiFePO4OH was found to intercalate lithium at 2.40 V and the reduced Li2FePO4OH phase was found to be amorphous.

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