Tavorite Lithium Iron Fluorophosphate Cathode Materials: Phase Transition and Electrochemistry of LiFePO[sub 4]F–Li[sub 2]FePO[sub 4]F | Zendy

T. N. Ramesh | Zendy; Kyu Tae Lee | Zendy; B. Ellis | Zendy; Linda F. Nazar | Zendy

Open Access

Tavorite Lithium Iron Fluorophosphate Cathode Materials: Phase Transition and Electrochemistry of LiFePO[sub 4]F–Li[sub 2]FePO[sub 4]F

Author(s) -

T. N. Ramesh,

Kyu Tae Lee,

B. Ellis,

Linda F. Nazar

Publication year - 2010

Publication title -

electrochemical and solid-state letters

Language(s) - English

Resource type - Journals

eISSN - 1944-8775

pISSN - 1099-0062

DOI - 10.1149/1.3298353

Subject(s) - isostructural , electrochemistry , triclinic crystal system , materials science , lithium (medication) , phase (matter) , phase transition , cathode , redox , solid state , chemical engineering , inorganic chemistry , crystallography , chemistry , crystal structure , electrode , organic chemistry , metallurgy , thermodynamics , medicine , physics , engineering , endocrinology

We have synthesized LiFePO4 F by a simple solid-state route as a pure single phase, which we show is isostructural with that of the minerals tavorite and amblygonite, and we report the first isolation of its fully lithium-inserted crystalline analog, Li2FePO4 F. We show that the latter adopts a triclinic P1̄- tavorite-type framework that is very closely related to the parent phase. The redox activity between these two compositions is very facile and occurs with an 8% change in volume to result in a reversible and stable capacity of about 145 mAh/g. The electrochemical cycling at both room temperature and 55°C is very stable.close837

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