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Title: Synthesis, impedance and electrochemical studies of lithium iron fluorophosphate, LiFePO4F cathode
Authors: Prabu, M.
Reddy, M.V. 
Selvasekarapandian, S.
Rao, G.V.S.
Chowdari, B.V.R. 
Keywords: Cathode
Impedance spectroscopy
Issue Date: 15-Dec-2012
Citation: Prabu, M., Reddy, M.V., Selvasekarapandian, S., Rao, G.V.S., Chowdari, B.V.R. (2012-12-15). Synthesis, impedance and electrochemical studies of lithium iron fluorophosphate, LiFePO4F cathode. Electrochimica Acta 85 : 572-578. ScholarBank@NUS Repository.
Abstract: Tavorite-structured LiFePO4F is synthesized by solid-state reaction and characterized by Rietveld refined X-ray diffraction, scanning electron microscopy, BET surface area, IR and Raman spectroscopy techniques. The ionic conductivity (σ ionic) of LiFePO4F estimated using impedance analysis at 27 °C and at 50 °C are 0.6(±0.1) × 10-7 and 5.4(±0.1) × 10-7 S cm-1, respectively, with an energy of activation (Ea) = 0.75 eV. Its electrochemical behavior were examined by galvanostatic charge-discharge cycling up to 100 cycles, cyclic voltammetry (CV) and electrochemical impedance spectroscopy using Li-metal as the counter and reference electrode, at 0.1C rate in the voltage range, 1.5-4 V. LiFePO4F delivers an initial discharge capacity of 115(±3) mAh g-1 which increases to 119(±3) mAh g-1 at the 20th cycle. The capacity degrades slowly thereafter over 100 cycles, with a capacity loss of 19%. CV data show a clear indication of the Fe3+/2+ redox couple at 3.3-2.6 V that involves a two-phase reaction. Electrochemical impedance spectra measured at various voltages at selected cycles were fitted to an equivalent circuit and the variation of impedance parameters interpreted. © 2012 Elsevier Ltd.
Source Title: Electrochimica Acta
ISSN: 00134686
DOI: 10.1016/j.electacta.2012.08.073
Appears in Collections:Staff Publications

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