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Site-dependent electrochemical performance of Na and K co-doped LiFePO4/C cathode material for lithium-ion batteries

Abstract

Olivine-type lithium iron phosphate (LiFePO4) has attracted much attention as a promising cathode material for lithium-ion batteries (LIBs). Na+ and K+ co doped LiFePO4/C composite materials in two discrete sites, namely the Li1-x-yNaxKyFePO4/C or Li site and LiFe1-x-yNaxKyPO4/C or Fe site (x=0.02, y=0.01) were synthesized via solid-state reaction route that is a simple and convenience method, especially for mass production. The effects of Na, K occupied sites are studied by X-‌ray diffraction (XRD), Rietveld analysis, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) mapping, and transmission electron microscopy (TEM). Furthermore, the electrochemical properties are evaluated by cyclic voltammograms (CVs), constant current charge/discharge cycling tests and electrochemical impedance spectroscopy (EIS). It was observed that the co-doped samples had higher electrochemical performances compared with the pristine LiFePO4/C material. The experimental results revealed that the Li0.97Na0.02K0.01FePO4/C composite had a higher capacity delivery and kinetic, than LiFe0.97Na0.02K0.01PO4/C sample. It delivers a discharge capacity of 159 (0.1C), 150 (0.5C), 146 (1C), 138 (3C) and 100 mAh g-1 (5C), respectively.

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Publication details

The article was received on 28 May 2017, accepted on 11 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ01872J
Citation: New J. Chem., 2017, Accepted Manuscript
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    Site-dependent electrochemical performance of Na and K co-doped LiFePO4/C cathode material for lithium-ion batteries

    A. R. Madram and M. Faraji, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01872J

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