Structural properties and application in lithium cells of Li(Ni0.5Co0.5)1−yFeyO2 (0 ≤ y ≤ 0.25) prepared by sol–gel route: Doping optimization

Structural properties and application in lithium cells of Li(Ni0.5Co0.5)1−yFeyO2... Layered Li(Co0.5Ni0.5)1−yFeyO2 (0.0 ≤ y ≤ 0.25) oxides were prepared by citric-acid assisted sol–gel method. Elemental and structural properties were investigated by energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Raman scattering (RS) and Mössbauer spectroscopy, and magnetometry. EDX images show a homogeneous distribution of Fe ions. XRD and RS spectroscopy reveal that the materials crystallize as a LiNiO2LiCoO2LiFeO2 solid solution with the typical rhombohedral α-NaFeO2 structure (R3¯ m S.G.) up to y = 0.2 at which composition a secondary phase was observed. For y > 0.2 the XRD results show the appearance of the α-LiFeO2 phase with the cubic structure (Fm3m S.G.). The degree of cation mixing investigated by XRD analysis and magnetic measurements is z < 0.04, for y < 0.2. Electrochemical tests of Li(Co0.5Ni0.5)1−yFeyO2 (0.0 ≤ y ≤ 0.1) oxides in lithium cells show the influence of iron substitution. The best results have been obtained for the composition y(Fe) = 0.05, where the electrical conductivity is maximum. A specific capacity 32 mAh g−1 is maintained at 8C rate. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Power Sources Elsevier

Structural properties and application in lithium cells of Li(Ni0.5Co0.5)1−yFeyO2 (0 ≤ y ≤ 0.25) prepared by sol–gel route: Doping optimization

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Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier B.V.
ISSN
0378-7753
D.O.I.
10.1016/j.jpowsour.2016.04.087
Publisher site
See Article on Publisher Site

Abstract

Layered Li(Co0.5Ni0.5)1−yFeyO2 (0.0 ≤ y ≤ 0.25) oxides were prepared by citric-acid assisted sol–gel method. Elemental and structural properties were investigated by energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Raman scattering (RS) and Mössbauer spectroscopy, and magnetometry. EDX images show a homogeneous distribution of Fe ions. XRD and RS spectroscopy reveal that the materials crystallize as a LiNiO2LiCoO2LiFeO2 solid solution with the typical rhombohedral α-NaFeO2 structure (R3¯ m S.G.) up to y = 0.2 at which composition a secondary phase was observed. For y > 0.2 the XRD results show the appearance of the α-LiFeO2 phase with the cubic structure (Fm3m S.G.). The degree of cation mixing investigated by XRD analysis and magnetic measurements is z < 0.04, for y < 0.2. Electrochemical tests of Li(Co0.5Ni0.5)1−yFeyO2 (0.0 ≤ y ≤ 0.1) oxides in lithium cells show the influence of iron substitution. The best results have been obtained for the composition y(Fe) = 0.05, where the electrical conductivity is maximum. A specific capacity 32 mAh g−1 is maintained at 8C rate.

Journal

Journal of Power SourcesElsevier

Published: Jul 15, 2016

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