Please use this identifier to cite or link to this item:
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

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Apr 1, 2023


checked on Mar 24, 2023

Page view(s)

checked on Mar 30, 2023

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.