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A highly fluorinated lithium iron phosphate with interpenetrating lattices: electrochemistry and ionic conductivity

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Abstract

Li5Fe2PO4F8, a new member of the family of alkali transition metal fluorophosphates, has been synthesized and characterized using single-crystal X-ray diffraction, 57Fe Mössbauer spectroscopy and magnetic susceptibility measurements. The existence of an infinite {–[PO4(FeF4)2]–} tetrahedral network in an inter-penetrated diamond lattice, along with the presence of seven unique Li sites, presents interesting structural features of this structure-type for energy storage applications. The initial results of (de)lithiation reveal that a relatively low fraction of theoretical capacity may be utilized reversibly (0.2 Li+ ion per formula unit), possibly due to the lack of available free volume for Li+ insertion. The high Li content and the existence of large channels in all 3-dimensions of space also offer opportunities to study this material as a candidate for solid-state electrolytes. The results from electro-impedance measurements reveal the reasonable activation energy of Li diffusion (0.70 eV), which is also supported by theoretical calculations.

Graphical abstract: A highly fluorinated lithium iron phosphate with interpenetrating lattices: electrochemistry and ionic conductivity

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Publication details

The article was received on 17 Jun 2017, accepted on 26 Aug 2017 and first published on 28 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT02202F
Citation: Dalton Trans., 2017, Advance Article
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    A highly fluorinated lithium iron phosphate with interpenetrating lattices: electrochemistry and ionic conductivity

    H. Yaghoobnejad Asl, K. Ghosh and A. Choudhury, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02202F

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