Tavorite Lithium Iron Fluorophosphate Cathode Materials: Phase Transition and Electrochemistry of LiFePO4F-Li2FePO4F
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- Tavorite Lithium Iron Fluorophosphate Cathode Materials: Phase Transition and Electrochemistry of LiFePO4F-Li2FePO4F
- Ramesh, T. N.; Lee, Kyu Tae; Ellis, B. L.; Nazar, L. F.
- Cathode materials; Electrochemical cycling; Fluorophosphate; Isostructural; LiFePO; Parent phase; Redox activity; Room temperature; Single phase; Solid-state routes
- Issue Date
- ELECTROCHEMICAL SOC INC
- ELECTROCHEMICAL AND SOLID STATE LETTERS, v.13, no.4, pp.A43 - A47
- 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.
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