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Na-ion Battery Cathode Materials Prepared by Electrochemical Ion Exchange from alumina-coated Li1+xMn0.54Co0.13Ni0.1+yO2

Abstract

Layered cathode materials of the type Na1+xLi0.05Mn0.54Co0.13NiyO2-z (0< x < 0.1, y = 0.13 or 0.2, z <0.1) were prepared by direct ion-exchange reactions, starting from Li1.2Mn0.54Co0.13Ni0.13O2 and Li1.13Mn0.54Co0.13Ni0.2O2. They were examined vs. Na foil or sodiated hard carbon anodes as high capacity positive electrode materials for Na ion batteries with initial reversible capacity of > 200 mAh/g. Analysis by X-ray and electron diffraction revealing that the new materials are initially mixtures of rhombohedral and monoclinic phases. Attempts to prepare layered compounds with similar compositions by chemical means resulted in phases of hexagonal structure with a rather poor electrochemical activity, emphasizing the importance of the synthesis by electrochemical ion exchange. Also, the stability of electrochemically prepared Na insertion cathode materials in cycling experiments was insufficient for practical consideration. In turn, cathodes prepared from the same Li precursors coated by a thin layer of alumina via atomic layer deposition technique, followed by an electrochemical Na/Li ion exchange, demonstrated a stable capacity (>170 mAh/g) during prolonged cycling. Their average discharge voltage was 300 mV higher compared to the counterpart coating-free uncoated Na intercalation cathodes. The structure and behavior of these electrodes were thoroughly explored by a variety of analytical and surface tools in conjunction with electrochemical techniques.

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Publication details

The article was received on 30 May 2018, accepted on 10 Jul 2018 and first published on 12 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA05068F
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Na-ion Battery Cathode Materials Prepared by Electrochemical Ion Exchange from alumina-coated Li1+xMn0.54Co0.13Ni0.1+yO2

    S. Bublil, M. Fayena-Greenstein, M. Talianker, N. Solomatin, M. Tsubery, T. R. Penki, J. Grinblat, I. Borges, I. Grinberg, Y. Ein-Eli, T. Bendikov, Y. Elias, P. Hartmann and D. Aurbach, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05068F

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