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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12613
Title: Antisite Defects in Sol-Gel-Synthesized LiFePO4 at Higher Temperature: Effect on Lithium-Ion Diffusion
Authors: Raj H.
Rani S.
Sil A.
Published in: ChemElectroChem
Abstract: In the present work, the study of atomic defects in LiFePO4 is achieved by Rietveld refinements. Several LiFePO4 samples are synthesized by using a sol-gel process with varying calcination times and argon flow rates. Quantitative analysis of XRD patterns through Rietveld refinements confirms 2 % antisite defects in the LiFePO4 sample. However, for the first time, we have observed antisite defects in LiFePO4 prepared through a sol-gel process at a higher temperature of 700 °C. Two samples identified as LFP−A and LFP−B are further studied by electrochemical analysis and electrochemical impedance spectroscopy to examine the effect of the antisite defects on the electrochemical performances and Li-ion diffusion of LiFePO4. Sample LFP−B with 2 % antisite defects shows, at 0.1 C rate, a lower discharge capacity of 138 mAh g−1 as compared to 150 mAh g−1 for LFP−A. LFP−B also shows shorter cycle life as well as rate capability at all of the C rates studied. Li-ion diffusion coefficients of LFP−A and LFP−B in initially prepared electrodes are found to be 1.669×10−13 and 1.198×10−13 cm2 s−1, respectively, whereas the diffusion coefficients after 200 cycles are 0.968×10−13 and 0.436×10−13 cm2 s−1, respectively. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Citation: ChemElectroChem (2018), 5(22): 3525-3532
URI: https://doi.org/10.1002/celc.201800889
http://repository.iitr.ac.in/handle/123456789/12613
Issue Date: 2018
Publisher: Wiley-VCH Verlag
Keywords: antisite defects
electrochemical performance
Li-ion batteries
LiFePO4
Rietveld refinements
ISSN: 21960216
Author Scopus IDs: 57190811180
57194783252
7003754102
Author Affiliations: Raj, H., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Rani, S., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Sil, A., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Funding Details: The authors acknowledge Council of Scientific and Industrial Research (CSIR), Government of India (Grant No. 03/1318/14/EMR-II) for their financial support. The authors would also like to acknowledge Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee for providing lab facilities and work space.
Corresponding Author: Sil, A.; Department of Metallurgical and Materials Engineering, Indian Institute of Technology RoorkeeIndia; email: asil1fmt@iitr.ac.in
Appears in Collections:Journal Publications [MT]

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