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Issue 28, 2009
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High capacity double-layer surface modified Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode with improved rate capability

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Abstract

Layered Li[Li0.2Mn0.54Ni0.13Co0.13]O2, which is a solid solution between layered Li[Li1/3Mn2/3]O2 and Li[Ni1/3Mn1/3Co1/3]O2, has been surface modified by single-layer coating with 2–5 wt.% AlPO4, CoPO4, and Al2O3 and double-layer coating with 2 wt.% AlPO4 or 2 wt.% CoPO4 inner layer and 2–3.5 wt.% Al2O3 outer layer. The samples have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), and electrochemical measurements in lithium cells. The double-layer coated samples are found to exhibit lower irreversible capacity loss (Cirr) and higher discharge capacity values than both the pristine and the single-layer coated samples, which are due to the retention of a higher number of oxide ion vacancies in the layered lattice after the first charge. The double-layer coated composite cathodes exhibit Cirr values as low as 26 mAh g−1 with a high discharge capacity of ∼300 mAh g−1, which is two times higher than that achieved with layered LiCoO2. Moreover, the double-layer coated samples exhibit higher rate capabilities than the pristine and single-layer coated samples, which are attributed to the suppression of undesired SEI layers and the fast charge transfer reaction kinetics as indicated by the EIS data.

Graphical abstract: High capacity double-layer surface modified Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode with improved rate capability

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Publication details

The article was received on 06 Jan 2009, accepted on 16 Apr 2009 and first published on 05 Jun 2009


Article type: Paper
DOI: 10.1039/B823506F
J. Mater. Chem., 2009,19, 4965-4972

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    High capacity double-layer surface modified Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode with improved rate capability

    Q. Y. Wang, J. Liu, A. V. Murugan and A. Manthiram, J. Mater. Chem., 2009, 19, 4965
    DOI: 10.1039/B823506F

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