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Issue 23, 2014
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Enhanced electrochemical performances of Li-rich layered oxides by surface modification with reduced graphene oxide/AlPO4 hybrid coating

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Abstract

The electrochemical performance of lithium-rich layered oxide cathode materials coated with reduced graphene oxide (rGO)/AlPO4 hybrid coatings has been investigated. The amount of graphene was varied from 0.5 to 4.0 wt%, while AlPO4 was maintained at 2.0 wt%. The structure and morphology of the samples have been investigated using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. Compared to the pristine cathode, the rGO/AlPO4-coated cathodes exhibit higher discharge capacity with lower irreversible capacity loss, better cyclability, and higher rate capability. Specifically, the rGO (0.5 wt%)/AlPO4 (2.0 wt%)- and rGO (1.0 wt%)/AlPO4 (2.0 wt%)-coated samples exhibit high discharge capacities of 235 mA h g−1 and 240 mA h g−1, respectively, at C/10 rate with capacity retentions of 94% and 95%, respectively, at 100 cycles. Moreover, the rGO/AlPO4-coated cathodes show better cyclability than the pristine cathode at an elevated temperature (55 °C). The superior electrochemical performances of the rGO/AlPO4-coated electrodes could be attributed to the decrease in the Li content in the solid-electrolyte interphase (SEI) layer and facilitation of faster charge transfer as suggested by XPS and electrochemical impedance spectroscopy (EIS).

Graphical abstract: Enhanced electrochemical performances of Li-rich layered oxides by surface modification with reduced graphene oxide/AlPO4 hybrid coating

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Publication details

The article was received on 21 Feb 2014, accepted on 19 Mar 2014 and first published on 20 Mar 2014


Article type: Paper
DOI: 10.1039/C4TA00898G
J. Mater. Chem. A, 2014,2, 8696-8704

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    Enhanced electrochemical performances of Li-rich layered oxides by surface modification with reduced graphene oxide/AlPO4 hybrid coating

    I. T. Kim, J. C. Knight, H. Celio and A. Manthiram, J. Mater. Chem. A, 2014, 2, 8696
    DOI: 10.1039/C4TA00898G

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