Solvothermal synthesis of electroactive lithium iron tavorites and structure of Li sub(2)FePO sub(4)F

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 fri...

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Bibliographic Details
Published in:Journal of materials chemistry 2012-02, Vol.22 (11), p.4759-4766
Main Authors: Ellis, B L, Ramesh, T N, Rowan-Weetaluktuk, W N, Ryan, D H, Nazar, L F
Format: Article
Language:English
Subjects:
Energy storage
Insertion
Iron
Lithium
Lithium batteries
Neutron diffraction
Transition metals
X-rays
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Summary: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 LiFePO sub(4)F, 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 Li sub(2)FePO sub(4)F was synthesized by lithiation of LiFePO sub(4)F, and solved viaRietveld refinement of the combined X-ray and neutron diffraction patterns, showing that Li super(+) occupies multiple sites in the tavorite lattice. LiFePO sub(4)OH was prepared by a new synthetic route and the electrochemical capacity for this material is the highest reported to date. LiFePO sub(4)OH was found to intercalate lithium at 2.40 V and the reduced Li sub(2)FePO sub(4)OH phase was found to be amorphous.
ISSN:0959-9428
1364-5501
DOI:10.1039/c2jm15273h