Nanostructured high-energy xLi2MnO3·(1-x)LiNi0.5Mn0.5O2 (0.3 ≤ x ≤ 0.6) cathode materials

Authors

  • Xiaofeng Zhang,

    1. Dept. of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO
    Current affiliation:
    1. Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL
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  • Miklos Lengyel,

    1. Dept. of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO
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  • Richard L. Axelbaum

    Corresponding author
    1. Dept. of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO
    • Correspondence concerning this article should be addressed to R. L. Axelbaum at axelbaum@wustl.edu.

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Abstract

Nanostructured lithium-manganese-rich nickel-manganese-oxide xLi2MnO3·(1-x)LiNi0.5Mn0.5O2 (0.3 ≤ x ≤ 0.6) composite materials were synthesized via spray pyrolysis using mixed nitrate precursors. All the materials showed a composite structure consisting of Li2MnO3 (C2/m) and LiNi0.5Mn0.5O2 inline image components, and the amount of Li2MnO3-phase appeared to increase with x, as observed from XRD analysis. These composite materials showed a high-discharge capacity of about 250 mAhg−1. In the range of x considered, the layered 0.5Li2MnO3·0.5LiNi0.5Mn0.5O2 materials displayed the highest capacity and superior cycle stability. Nonetheless, voltage suppression from a layered-spinel phase transition was observed for all the composites produced. This voltage suppression was dependent of the amount of Li2MnO3 phase present in the composite structure. © 2013 American Institute of Chemical Engineers AIChE J 60: 443–450, 2014

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